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