| NAA | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NAB | Arkansas | Arkansas Blue-Cross Blue-Shield |
| NAC | Alabama | Blue-Cross Blue-Shield of Alabama |
| NAD | - | Unallocated/Not Assigned |
| NAE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NAF | Alabama | Blue-Cross Blue-Shield of Alabama |
| NAG | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NAH | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NAI | Texas | Blue-Cross Blue-Shield of Texas |
| NAJ | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| NAK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NAL | Michigan | Blue-Cross Blue-Shield of Michigan |
| NAM | Idaho | Blue-Cross of Idaho |
| NAN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NAO | California | Blue-Shield of California |
| NAP | California | Blue-Shield of California |
| NAQ | - | Unallocated/Not Assigned |
| NAR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NAS | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NAT | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NAU | New York | Excellus Blue-Cross Blue-Shield of New York |
| NAV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NAW | Michigan | Blue-Cross Blue-Shield of Michigan |
| NAX | Michigan | Blue-Cross Blue-Shield of Michigan |
| NAY | Alaska | Premera Blue-Cross of Alaska |
| NAZ | California | Blue-Shield of California |
| NBA | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NBB | - | Unallocated/Not Assigned |
| NBC | - | Unallocated/Not Assigned |
| NBD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NBE | Arizona | Blue-Cross Blue-Shield of Arizona |
| NBF | - | Unallocated/Not Assigned |
| NBG | - | Unallocated/Not Assigned |
| NBH | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| NBI | Michigan | Blue-Cross Blue-Shield of Michigan |
| NBJ | - | Unallocated/Not Assigned |
| NBK | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NBL | - | Unallocated/Not Assigned |
| NBM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NBN | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NBO | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| NBP | New York | Empire Blue-Cross Blue-Shield of New York |
| NBQ | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NBR | Illinois | Blue-Cross Blue-Shield of Illinois |
| NBS | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NBT | Arizona | Blue-Cross Blue-Shield of Arizona |
| NBU | Michigan | Blue-Cross Blue-Shield of Michigan |
| NBV | - | Unallocated/Not Assigned |
| NBW | Illinois | Blue-Cross Blue-Shield of Illinois |
| NBX | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NBY | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NBZ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NCA | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NCB | Illinois | Blue-Cross Blue-Shield of Illinois |
| NCC | - | Unallocated/Not Assigned |
| NCD | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| NCE | Michigan | Blue-Cross Blue-Shield of Michigan |
| NCF BCBS Prefix | California | Anthem Blue-Cross |
| NCG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NCH | Michigan | Blue-Cross Blue-Shield of Michigan |
| NCI | Illinois | Blue-Cross Blue-Shield of Illinois |
| NCJ | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NCK | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NCL | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NCM | New York | Empire Blue-Cross Blue-Shield of New York |
| NCN | Illinois | Blue-Cross Blue-Shield of Illinois |
| NCO | California | Blue-Shield of California |
| NCP | - | Unallocated/Not Assigned |
| NCQ | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| NCR | New York | Empire Blue-Cross Blue-Shield of New York |
| NCS | Arkansas | Arkansas Blue-Cross Blue-Shield |
| NCT | Alaska | Premera Blue-Cross of Alaska |
| NCU | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NCV | - | Unallocated/Not Assigned |
| NCW | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NCX | Illinois | Blue-Cross Blue-Shield of Illinois |
| NCY | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NCZ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NDA | - | Unallocated/Not Assigned |
| NDB | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| NDC | - | Unallocated/Not Assigned |
| NDD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NDE | Michigan | Blue-Cross Blue-Shield of Michigan |
| NDF | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| NDG | California | Anthem Blue-Cross |
| NDH | Alabama | Blue-Cross Blue-Shield of Alabama |
| NDI | - | Unallocated/Not Assigned |
| NDJ | Alabama | Blue-Cross Blue-Shield of Alabama |
| NDK | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NDL | - | Unallocated/Not Assigned |
| NDM | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| NDN | - | Unallocated/Not Assigned |
| NDO | California | Blue-Shield of California |
| NDP | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NDQ | California | Blue-Shield of California |
| NDR | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NDS | - | Unallocated/Not Assigned |
| NDT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NDU | - | Unallocated/Not Assigned |
| NDV | - | Unallocated/Not Assigned |
| NDW | - | Unallocated/Not Assigned |
| NDX | - | Unallocated/Not Assigned |
| NDY | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NDZ | - | Unallocated/Not Assigned |
| NEA | Illinois | Blue-Cross Blue-Shield of Illinois |
| NEB | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NEC | Illinois | Blue-Cross Blue-Shield of Illinois |
| NED | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NEE | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NEF | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NEG | Florida | Florida-Blue |
| NEH | - | Unallocated/Not Assigned |
| NEI BCBS Prefix | Illinois | Blue-Cross Blue-Shield of Illinois |
| NEJ | - | Unallocated/Not Assigned |
| NEK | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NEL | Alabama | Blue-Cross Blue-Shield of Alabama |
| NEM | - | Unallocated/Not Assigned |
| NEN | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NEO | - | Unallocated/Not Assigned |
| NEP | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NEQ | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NER | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NES | Florida | Florida-Blue |
| NET | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| NEU | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NEV | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| NEW | Alabama | Blue-Cross Blue-Shield of Alabama |
| NEX | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NEY | - | Unallocated/Not Assigned |
| NEZ | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NFA | Illinois | Blue-Cross Blue-Shield of Illinois |
| NFB | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NFC | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NFD | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NFE | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NFF | - | Unallocated/Not Assigned |
| NFG | Illinois | Blue-Cross Blue-Shield of Illinois |
| NFH | - | Unallocated/Not Assigned |
| NFI | Vermont | Blue-Cross Blue-Shield of Vermont |
| NFJ | New York | Excellus Blue-Cross Blue-Shield of New York |
| NFK | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NFL | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NFM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NFN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NFO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NFP | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NFQ | - | Unallocated/Not Assigned |
| NFR | - | Unallocated/Not Assigned |
| NFS | Florida | Florida-Blue |
| NFT | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NFU | - | Unallocated/Not Assigned |
| NFV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NFW | - | Unallocated/Not Assigned |
| NFX | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NFY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NFZ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGA | - | Unallocated/Not Assigned |
| NGB | Florida | Florida-Blue |
| NGC | Illinois | Blue-Cross Blue-Shield of Illinois |
| NGD | Florida | Florida-Blue |
| NGE | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGF | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGG | California | Anthem Blue-Cross |
| NGH | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NGI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NGK | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGL | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NGM | - | Unallocated/Not Assigned |
| NGN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGO BCBS Prefix | California | Anthem Blue-Cross |
| NGP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NGQ | - | Unallocated/Not Assigned |
| NGR | - | Unallocated/Not Assigned |
| NGS | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NGT | - | Unallocated/Not Assigned |
| NGU | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NGV | - | Unallocated/Not Assigned |
| NGW | California | Blue-Shield of California |
| NGX | Illinois | Blue-Cross Blue-Shield of Illinois |
| NGY | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NGZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NHA | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NHB | Alabama | Blue-Cross Blue-Shield of Alabama |
| NHC | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NHD | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NHE | - | Unallocated/Not Assigned |
| NHF | - | Unallocated/Not Assigned |
| NHG | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| NHH | California | Blue-Shield of California |
| NHI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NHJ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NHK | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NHL | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NHM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NHN | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NHO | California | Blue-Shield of California |
| NHP | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NHQ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NHR | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NHS | - | Unallocated/Not Assigned |
| NHT | Michigan | Blue-Cross Blue-Shield of Michigan |
| NHU | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| NHV | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| NHW | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| NHX | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NHY | - | Unallocated/Not Assigned |
| NHZ | - | Unallocated/Not Assigned |
| NIA | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| NIB | - | Unallocated/Not Assigned |
| NIC | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NID | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NIE | California | Anthem Blue-Cross |
| NIF | - | Unallocated/Not Assigned |
| NIG | - | Unallocated/Not Assigned |
| NIH | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NII | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NIJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| NIK | - | Unallocated/Not Assigned |
| NIL | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NIM | - | Unallocated/Not Assigned |
| NIN | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NIO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NIP | California | Blue-Shield of California |
| NIQ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NIR | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NIS | Idaho | Blue-Cross of Idaho |
| NIT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NIU | Florida | Florida-Blue |
| NIV | California | Anthem Blue-Cross |
| NIW | New York | Empire Blue-Cross Blue-Shield of New York |
| NIX | New York | Empire Blue-Cross Blue-Shield of New York |
| NIY | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| NIZ | - | Unallocated/Not Assigned |
| NJA | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NJB | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NJC | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NJD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJE | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJF | Illinois | Blue-Cross Blue-Shield of Illinois |
| NJG | Texas | Blue-Cross Blue-Shield of Texas |
| NJH | - | Unallocated/Not Assigned |
| NJI | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJJ | - | Unallocated/Not Assigned |
| NJK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NJL | Michigan | Blue-Cross Blue-Shield of Michigan |
| NJM | California | Anthem Blue-Cross |
| NJN | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJO | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJP | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJQ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NJR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJS | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJT | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJU | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| NJV | Michigan | Blue-Cross Blue-Shield of Michigan |
| NJW BCBS Prefix | - | Unallocated/Not Assigned |
| NJX BCBS Prefix | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NJY | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| NJZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NKA | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NKB | California | Anthem Blue-Cross |
| NKC | - | Unallocated/Not Assigned |
| NKD | - | Unallocated/Not Assigned |
| NKE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NKF | Alabama | Blue-Cross Blue-Shield of Alabama |
| NKG | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NKH | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NKI | - | Unallocated/Not Assigned |
| NKJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| NKK | Michigan | Blue-Cross Blue-Shield of Michigan |
| NKL | Illinois | Blue-Cross Blue-Shield of Illinois |
| NKM | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NKN | California | Anthem Blue-Cross |
| NKO | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NKP | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NKQ | Michigan | Blue-Cross Blue-Shield of Michigan |
| NKR | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| NKS | Michigan | Blue-Cross Blue-Shield of Michigan |
| NKT | Illinois | Blue-Cross Blue-Shield of Illinois |
| NKU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NKV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NKW | - | Unallocated/Not Assigned |
| NKX | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NKY | Michigan | Blue-Cross Blue-Shield of Michigan |
| NKZ | - | Unallocated/Not Assigned |
| NLA | Michigan | Blue-Cross Blue-Shield of Michigan |
| NLB | Illinois | Blue-Cross Blue-Shield of Illinois |
| NLC | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| NLD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NLE | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NLF | - | Unallocated/Not Assigned |
| NLG | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NLH | Michigan | Blue-Cross Blue-Shield of Michigan |
| NLI | Alabama | Blue-Cross Blue-Shield of Alabama |
| NLJ | Alabama | Blue-Cross Blue-Shield of Alabama |
| NLK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NLL | Illinois | Blue-Cross Blue-Shield of Illinois |
| NLM BCBS Prefix | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NLN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NLO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NLP | California | Blue-Shield of California |
| NLQ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NLR | Texas | Blue-Cross Blue-Shield of Texas |
| NLS | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NLT BCBS Prefix | Texas | Blue-Cross Blue-Shield of Texas |
| NLU | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NLV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NLW | - | Unallocated/Not Assigned |
| NLX | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NLY | - | Unallocated/Not Assigned |
| NLZ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NMA | Florida | Florida-Blue |
| NMB | - | Unallocated/Not Assigned |
| NMC | - | Unallocated/Not Assigned |
| NMD | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| NME | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NMF | - | Unallocated/Not Assigned |
| NMG | - | Unallocated/Not Assigned |
| NMH | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NMI | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NMJ | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| NMK | - | Unallocated/Not Assigned |
| NML | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NMM | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| NMN | - | Unallocated/Not Assigned |
| NMO | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NMP | Illinois | Blue-Cross Blue-Shield of Illinois |
| NMQ | - | Unallocated/Not Assigned |
| NMR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NMS | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NMT | Illinois | Blue-Cross Blue-Shield of Illinois |
| NMU | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NMV | - | Unallocated/Not Assigned |
| NMW | Illinois | Blue-Cross Blue-Shield of Illinois |
| NMX | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| NMY | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NMZ | - | Unallocated/Not Assigned |
| NNA | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NNB | - | Unallocated/Not Assigned |
| NNC | Idaho | Blue-Cross of Idaho |
| NND | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NNE | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NNF | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NNG | Arizona | Blue-Cross Blue-Shield of Arizona |
| NNH | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NNI | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NNJ | Arizona | Blue-Cross Blue-Shield of Arizona |
| NNK | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NNL | - | Unallocated/Not Assigned |
| NNM | - | Unallocated/Not Assigned |
| NNN | Illinois | Blue-Cross Blue-Shield of Illinois |
| NNO | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NNP | Illinois | Blue-Cross Blue-Shield of Illinois |
| NNQ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NNR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NNS | - | Unallocated/Not Assigned |
| NNT | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NNU | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NNV | - | Unallocated/Not Assigned |
| NNW | Montana | Blue-Cross Blue-Shield of Montana |
| NNX | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NNY | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NNZ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NOA | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NOB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NOC | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NOD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NOE | California | Anthem Blue-Cross |
| NOF | Michigan | Blue-Cross Blue-Shield of Michigan |
| NOG | Michigan | Blue-Cross Blue-Shield of Michigan |
| NOH | - | Unallocated/Not Assigned |
| NOI | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NOJ | - | Unallocated/Not Assigned |
| NOK | - | Unallocated/Not Assigned |
| NOL | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NOM | - | Unallocated/Not Assigned |
| NON | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NOO | - | Unallocated/Not Assigned |
| NOP | - | Unallocated/Not Assigned |
| NOQ | - | Unallocated/Not Assigned |
| NOR | Arizona | Blue-Cross Blue-Shield of Arizona |
| NOS | - | Unallocated/Not Assigned |
| NOT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NOU | California | Anthem Blue-Cross |
| NOV | - | Unallocated/Not Assigned |
| NOW | - | Unallocated/Not Assigned |
| NOX | - | Unallocated/Not Assigned |
| NOY | California | Blue-Shield of California |
| NOZ | - | Unallocated/Not Assigned |
| NPA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NPB | - | Unallocated/Not Assigned |
| NPC | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| NPD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NPE | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NPF | - | Unallocated/Not Assigned |
| NPG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NPH | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NPI | Michigan | Blue-Cross Blue-Shield of Michigan |
| NPJ | Florida | Florida-Blue |
| NPK | Michigan | Blue-Cross Blue-Shield of Michigan |
| NPL | Michigan | Blue-Cross Blue-Shield of Michigan |
| NPM | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| NPN | - | Unallocated/Not Assigned |
| NPO | California | Blue-Shield of California |
| NPP | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NPQ | - | Unallocated/Not Assigned |
| NPR | Illinois | Blue-Cross Blue-Shield of Illinois |
| NPS | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NPT | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NPU | New York | Empire Blue-Cross Blue-Shield of New York |
| NPV | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NPW | - | Unallocated/Not Assigned |
| NPX | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| NPY | - | Unallocated/Not Assigned |
| NPZ | - | Unallocated/Not Assigned |
| NQA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NQB | - | Unallocated/Not Assigned |
| NQC | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NQD | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NQE | - | Unallocated/Not Assigned |
| NQF | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NQG | Michigan | Blue-Cross Blue-Shield of Michigan |
| NQH | - | Unallocated/Not Assigned |
| NQI | Michigan | Blue-Cross Blue-Shield of Michigan |
| NQJ | - | Unallocated/Not Assigned |
| NQK | - | Unallocated/Not Assigned |
| NQL | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NQM | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| NQN | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NQO | Idaho | Blue-Cross of Idaho |
| NQP | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| NQQ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NQR | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NQS | - | Unallocated/Not Assigned |
| NQT | - | Unallocated/Not Assigned |
| NQU | Michigan | Blue-Cross Blue-Shield of Michigan |
| NQV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NQW | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NQX | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NQY | - | Unallocated/Not Assigned |
| NQZ | - | Unallocated/Not Assigned |
| NRA | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NRB | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NRC | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NRD | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| NRE | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| NRF | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NRG | Illinois | Blue-Cross Blue-Shield of Illinois |
| NRH | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NRI | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NRJ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NRK | - | Unallocated/Not Assigned |
| NRL | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NRM | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NRN | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NRO | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NRP | - | Unallocated/Not Assigned |
| NRQ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NRR | - | Unallocated/Not Assigned |
| NRS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NRT | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NRU | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NRV | - | Unallocated/Not Assigned |
| NRW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NRX | - | Unallocated/Not Assigned |
| NRY | - | Unallocated/Not Assigned |
| NRZ | - | Unallocated/Not Assigned |
| NSA BCBS Prefix | California | Anthem Blue-Cross |
| NSB | - | Unallocated/Not Assigned |
| NSC | California | Blue-Shield of California |
| NSD | Michigan | Blue-Cross Blue-Shield of Michigan |
| NSE | - | Unallocated/Not Assigned |
| NSF | - | Unallocated/Not Assigned |
| NSG | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NSH | - | Unallocated/Not Assigned |
| NSI | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NSJ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NSK | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NSL | California | Blue-Shield of California |
| NSM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NSN | - | Unallocated/Not Assigned |
| NSO | New York | Excellus Blue-Cross Blue-Shield of New York |
| NSP | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NSQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NSR | Idaho | Blue-Cross of Idaho |
| NSS | Michigan | Blue-Cross Blue-Shield of Michigan |
| NST | - | Unallocated/Not Assigned |
| NSU | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NSV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NSW | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NSX | - | Unallocated/Not Assigned |
| NSY | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NSZ | - | Unallocated/Not Assigned |
| NTA | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| NTB | Michigan | Blue-Cross Blue-Shield of Michigan |
| NTC | - | Unallocated/Not Assigned |
| NTD | - | Unallocated/Not Assigned |
| NTE | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| NTF | - | Unallocated/Not Assigned |
| NTG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NTH | - | Unallocated/Not Assigned |
| NTI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NTJ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NTK | - | Unallocated/Not Assigned |
| NTL | - | Unallocated/Not Assigned |
| NTM | Illinois | Blue-Cross Blue-Shield of Illinois |
| NTN | California | Anthem Blue-Cross |
| NTO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NTP | New York | Empire Blue-Cross Blue-Shield of New York |
| NTQ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| NTR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NTS | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| NTT | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NTU | Alabama | Blue-Cross Blue-Shield of Alabama |
| NTV | California | Blue-Shield of California |
| NTW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NTX | California | Blue-Shield of California |
| NTY | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NTZ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NUA | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NUB | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| NUC | Illinois | Blue-Cross Blue-Shield of Illinois |
| NUD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NUE | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NUF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NUG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NUH | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NUI | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NUJ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NUK | Texas | Blue-Cross Blue-Shield of Texas |
| NUL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NUM | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NUN | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NUO | Michigan | Blue-Cross Blue-Shield of Michigan |
| NUP | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NUQ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NUR | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| NUS | Illinois | Blue-Cross Blue-Shield of Illinois |
| NUT | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NUU | Illinois | Blue-Cross Blue-Shield of Illinois |
| NUV | Illinois | Blue-Cross Blue-Shield of Illinois |
| NUW | - | Unallocated/Not Assigned |
| NUX | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| NUY | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| NUZ | - | Unallocated/Not Assigned |
| NVA | - | Unallocated/Not Assigned |
| NVB | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NVC | - | Unallocated/Not Assigned |
| NVD | Illinois | Blue-Cross Blue-Shield of Illinois |
| NVE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NVF | - | Unallocated/Not Assigned |
| NVG | Michigan | Blue-Cross Blue-Shield of Michigan |
| NVH | - | Unallocated/Not Assigned |
| NVI | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NVJ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| NVK | Texas | Blue-Cross Blue-Shield of Texas |
| NVL | Texas | Blue-Cross Blue-Shield of Texas |
| NVM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NVN | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NVO | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NVP | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NVQ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NVR | - | Unallocated/Not Assigned |
| NVS | - | Unallocated/Not Assigned |
| NVT | Florida | Florida-Blue |
| NVU | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NVV | Illinois | Blue-Cross Blue-Shield of Illinois |
| NVW | - | Unallocated/Not Assigned |
| NVX | Illinois | Blue-Cross Blue-Shield of Illinois |
| NVY | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NVZ | Florida | Florida-Blue |
| NWA | - | Unallocated/Not Assigned |
| NWB | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NWC | - | Unallocated/Not Assigned |
| NWD | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| NWE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NWF | - | Unallocated/Not Assigned |
| NWG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NWH | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NWI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| NWJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NWK | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| NWL | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NWM | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NWN | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NWO | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NWP | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| NWQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NWR | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NWS | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NWT | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NWU | - | Unallocated/Not Assigned |
| NWV | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| NWW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NWX | Idaho | Blue-Cross of Idaho |
| NWY | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| NWZ | - | Unallocated/Not Assigned |
| NXA | - | Unallocated/Not Assigned |
| NXB | - | Unallocated/Not Assigned |
| NXC | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| NXD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NXE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NXF | - | Unallocated/Not Assigned |
| NXG | Arizona | Blue-Cross Blue-Shield of Arizona |
| NXH | California | Blue-Shield of California |
| NXI | California | Blue-Shield of California |
| NXJ | - | Unallocated/Not Assigned |
| NXK | - | Unallocated/Not Assigned |
| NXL | - | Unallocated/Not Assigned |
| NXM | - | Unallocated/Not Assigned |
| NXN | Idaho | Blue-Cross of Idaho |
| NXO | New York (Northeastern) | Blue-Shield of Northeastern New York |
| NXP | - | Unallocated/Not Assigned |
| NXQ | Illinois | Blue-Cross Blue-Shield of Illinois |
| NXR | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| NXS | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| NXT | California | Blue-Shield of California |
| NXU | New York | Empire Blue-Cross Blue-Shield of New York |
| NXV | - | Unallocated/Not Assigned |
| NXW | Alaska | Premera Blue-Cross of Alaska |
| NXX | - | Unallocated/Not Assigned |
| NXY | - | Unallocated/Not Assigned |
| NXZ | - | Unallocated/Not Assigned |
| NYA | New York | Empire Blue-Cross Blue-Shield of New York |
| NYB | New York | Empire Blue-Cross Blue-Shield of New York |
| NYC | New York | Empire Blue-Cross Blue-Shield of New York |
| NYD | New York | Empire Blue-Cross Blue-Shield of New York |
| NYE | New York (Northeastern) | Blue-Shield of Northeastern New York |
| NYF | New York (Northeastern) | Blue-Shield of Northeastern New York |
| NYG | New York | Empire Blue-Cross Blue-Shield of New York |
| NYH | New York | Empire Blue-Cross Blue-Shield of New York |
| NYI | New York | Empire Blue-Cross Blue-Shield of New York |
| NYJ | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NYK | Texas | Blue-Cross Blue-Shield of Texas |
| NYL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| NYM | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| NYN | New York | Empire Blue-Cross Blue-Shield of New York |
| NYO | - | Unallocated/Not Assigned |
| NYP | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| NYQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NYR | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NYS | - | Unallocated/Not Assigned |
| NYT | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NYU | - | Unallocated/Not Assigned |
| NYV | - | Unallocated/Not Assigned |
| NYW | Illinois | Blue-Cross Blue-Shield of Illinois |
| NYX | Alabama | Blue-Cross Blue-Shield of Alabama |
| NYY | New York | Empire Blue-Cross Blue-Shield of New York |
| NYZ | Texas | Blue-Cross Blue-Shield of Texas |
| NZA | Illinois | Blue-Cross Blue-Shield of Illinois |
| NZB | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NZC | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NZD | - | Unallocated/Not Assigned |
| NZE | - | Unallocated/Not Assigned |
| NZF | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NZG | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NZH | Michigan | Blue-Cross Blue-Shield of Michigan |
| NZI | Arizona | Blue-Cross Blue-Shield of Arizona |
| NZJ | - | Unallocated/Not Assigned |
| NZK | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| NZL | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NZM | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| NZN | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NZO | Michigan | Blue-Cross Blue-Shield of Michigan |
| NZP | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| NZQ | Michigan | Blue-Cross Blue-Shield of Michigan |
| NZR | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| NZS | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| NZT | Florida | Florida-Blue |
| NZU | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| NZV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| NZW | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| NZX | - | Unallocated/Not Assigned |
| NZY | Illinois | Blue-Cross Blue-Shield of Illinois |
| NZZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |