| NAA | Wellmark Blue Cross Blue Shield |
| NAB | Blue Cross Blue Shield of Arkansas Blue Advantage |
| NAC | Blue Cross Blue Shield of Alabama |
| NAD | Blue Cross Blue Shield of Tennessee |
| NAE | Wellmark Blue Cross Blue Shield |
| NAF | Blue Cross Blue Shield of Alabama |
| NAG | Blue Cross Blue Shield of Western New York |
| NAH | Anthem Blue Cross Blue Shield of Virginia |
| NAI | Blue Cross Blue Shield of Texas |
| NAJ | Anthem Blue Cross Blue Shield of Kentucky |
| NAK | Carefirst Blue Cross Blue Shield of Maryland |
| NAL | Blue Cross Blue Shield of Michigan |
| NAM | Blue Cross of Idaho |
| NAN | Blue Cross Blue Shield of Massachusetts |
| NAO | Blue Shield of California |
| NAP | Highmark Blue Cross Blue Shield |
| NAQ | No Prefix Assigned |
| NAR | Wellmark Blue Cross Blue Shield |
| NAS | Regence Blue Cross Blue Shield of Washington |
| NAT | Horizon Blue Cross Blue Shield of New Jersey |
| NAU | Excellus Blue Cross Blue Shield of New York |
| NAV | Blue Cross Blue Shield of Massachusetts |
| NAW | Blue Cross Blue Shield of Michigan |
| NAX | Blue Cross Blue Shield of Michigan |
| NAY | Premera Blue Cross |
| NAZ | Blue Shield of California |
| NBA | Wellmark Blue Cross Blue Shield |
| NBB | Regence Blue Cross Blue Shield of Oregon |
| NBC | Blue Cross Blue Shield of Delaware |
| NBD | Wellmark Blue Cross Blue Shield |
| NBE | Blue Cross Blue Shield of Arizona |
| NBF | Blue Shield of California |
| NBG | Anthem Blue Cross of California |
| NBH | Anthem Blue Cross Blue Shield of Wisconsin |
| NBI | Blue Cross Blue Shield of Michigan |
| NBJ | No Prefix Assigned |
| NBK | Blue Cross Blue Shield of Nebraska |
| NBL | Blue Cross Blue Shield of Tennessee |
| NBM | Wellmark Blue Cross Blue Shield |
| NBN | Blue Cross Blue Shield of Nebraska |
| NBO | Anthem Blue Cross Blue Shield of Colorado |
| NBP | Empire Blue Cross Blue Shield of New York |
| NBQ | Blue Cross Blue Shield of North Carolina |
| NBR | Blue Cross Blue Shield of Illinois |
| NBS | No Prefix Assigned |
| NBT | Excellus Blue Cross Blue Shield of New York |
| NBU | Blue Cross Blue Shield of Michigan |
| NBV | No Prefix Assigned |
| NBW | Blue Cross Blue Shield of Illinois |
| NBX | Anthem Blue Cross Blue Shield of Virginia |
| NBY | Blue Cross Blue Shield of Massachusetts |
| NBZ | Horizon Blue Cross Blue Shield of New Jersey |
| NCA | Blue Cross Blue Shield of Tennessee |
| NCB | Blue Cross Blue Shield of Illinois |
| NCC | No Prefix Assigned |
| NCD | Blue Cross Blue Shield of Delaware |
| NCE | Blue Cross Blue Shield of Michigan |
| NCF | Anthem Blue Cross of California |
| NCG | Wellmark Blue Cross Blue Shield |
| NCH | Blue Cross Blue Shield of Michigan |
| NCI | Blue Cross Blue Shield of Illinois |
| NCJ | Blue Cross Blue Shield of North Carolina |
| NCK | Blue Cross Blue Shield of North Carolina |
| NCL | Horizon Blue Cross Blue Shield of New Jersey |
| NCM | Empire Blue Cross Blue Shield of New York |
| NCN | Blue Cross Blue Shield of Illinois |
| NCO | Blue Shield of California |
| NCP | Blue Cross Blue Shield of North Carolina |
| NCQ | Blue Cross Blue Shield of Delaware |
| NCR | Blue Cross Blue Shield of North Carolina |
| NCS | Blue Cross Blue Shield of Arkansas Blue Advantage |
| NCT | Premera Blue Cross |
| NCU | Horizon Blue Cross Blue Shield of New Jersey |
| NCV | Blue Shield of California |
| NCW | Premera Blue Cross |
| NCX | Blue Cross Blue Shield of Illinois |
| NCY | Blue Cross Blue Shield of Illinois |
| NCZ | Premera Blue Cross |
| NDA | No Prefix Assigned |
| NDB | Anthem Blue Cross Blue Shield of Wisconsin |
| NDC | No Prefix Assigned |
| NDD | Horizon Blue Cross Blue Shield of New Jersey |
| NDE | Blue Cross Blue Shield of Michigan |
| NDF | Anthem Blue Cross Blue Shield of Indiana |
| NDG | Anthem Blue Cross of California |
| NDH | No Prefix Assigned |
| NDI | Carefirst Blue Cross Blue Shield of Maryland |
| NDJ | Blue Cross Blue Shield of Texas |
| NDK | Anthem Blue Cross Blue Shield of New Hampshire |
| NDL | No Prefix Assigned |
| NDM | Anthem Blue Cross Blue Shield of Wisconsin |
| NDN | No Prefix Assigned |
| NDO | Blue Shield of California |
| NDP | Carefirst Administrators |
| NDQ | Blue Shield of California |
| NDR | Highmark Blue Cross Blue Shield |
| NDS | No Prefix Assigned |
| NDT | Anthem Blue Cross of California |
| NDU | Anthem Blue Cross of California |
| NDV | Anthem Blue Cross of California |
| NDW | No Prefix Assigned |
| NDX | No Prefix Assigned |
| NDY | Wellmark Blue Cross Blue Shield |
| NDZ | No Prefix Assigned |
| NEA | Blue Cross Blue Shield of Illinois |
| NEB | Horizon Blue Cross Blue Shield of New Jersey |
| NEC | Blue Cross Blue Shield of Illinois |
| NED | Blue Cross Blue Shield of Nebraska |
| NEE | Blue Cross Blue Shield of Western New York |
| NEF | Blue Cross Blue Shield of Western New York |
| NEG | Blue Cross Blue Shield of Florida |
| NEH | No Prefix Assigned |
| NEI | Blue Cross Blue Shield of Illinois |
| NEJ | No Prefix Assigned |
| NEK | Blue Cross Blue Shield of Tennessee |
| NEL | Blue Cross Blue Shield of Alabama |
| NEM | Blue Cross Blue Shield of Delaware |
| NEN | Blue Cross Blue Shield of South Carolina |
| NEO | No Prefix Assigned |
| NEP | Blue Cross Blue Shield of Minnesota |
| NEQ | Blue Cross Blue Shield of Nebraska |
| NER | Regence Blue Cross Blue Shield |
| NES | Blue Cross Blue Shield of South Carolina |
| NET | Anthem Blue Cross Blue Shield of Connecticut |
| NEU | Blue Cross Blue Shield of Minnesota |
| NEV | Anthem Blue Cross Blue Shield of Kentucky |
| NEW | Blue Cross Blue Shield of Alabama |
| NEX | Regence Blue Cross Blue Shield of Oregon |
| NEY | No Prefix Assigned |
| NEZ | Blue Cross Blue Shield of Tennessee |
| NFA | Blue Cross Blue Shield of Illinois |
| NFB | Blue Cross Blue Shield of Western New York |
| NFC | Horizon Blue Cross Blue Shield of New Jersey |
| NFD | Blue Cross Blue Shield of Western New York |
| NFE | Horizon Blue Cross Blue Shield of New Jersey |
| NFF | Regence Blue Cross Blue Shield |
| NFG | Blue Cross Blue Shield of Illinois |
| NFH | Carefirst Administrators |
| NFI | Blue Cross Blue Shield of Vermont |
| NFJ | Excellus Blue Cross Blue Shield of New York |
| NFK | Premera Blue Cross |
| NFL | Blue Cross Blue Shield of Western New York |
| NFM | Highmark Blue Cross Blue Shield |
| NFN | Highmark Blue Cross Blue Shield |
| NFO | Wellmark Blue Cross Blue Shield |
| NFP | Blue Cross Blue Shield of Western New York |
| NFQ | Blue Cross Blue Shield of Western New York |
| NFR | Carefirst Administrators |
| NFS | Blue Cross Blue Shield of Florida |
| NFT | Blue Cross Blue Shield of Western New York |
| NFU | Blue Cross Blue Shield of North Carolina |
| NFV | Carefirst Blue Cross Blue Shield of Maryland |
| NFW | Horizon Blue Cross Blue Shield of New Jersey |
| NFX | Premera Blue Cross |
| NFY | Carefirst Blue Cross Blue Shield of Maryland |
| NFZ | Blue Cross Blue Shield of Massachusetts |
| NGA | Horizon Blue Cross Blue Shield of New Jersey |
| NGB | Blue Cross Blue Shield of South Carolina |
| NGC | Blue Cross Blue Shield of Illinois |
| NGD | Blue Cross Blue Shield of South Carolina |
| NGE | Blue Cross Blue Shield of Massachusetts |
| NGF | Blue Cross Blue Shield of Massachusetts |
| NGG | Anthem Blue Cross Blue Shield of Virginia |
| NGH | Anthem Blue Cross Blue Shield of New Hampshire |
| NGI | Blue Cross Blue Shield of Massachusetts |
| NGJ | No Prefix Assigned |
| NGK | Blue Cross Blue Shield of Massachusetts |
| NGL | Anthem Blue Cross Blue Shield of New Hampshire |
| NGM | Anthem Blue Cross of California |
| NGN | Blue Cross Blue Shield of Massachusetts |
| NGO | Anthem Blue Cross of California |
| NGP | Wellmark Blue Cross Blue Shield |
| NGQ | Carefirst Blue Cross Blue Shield of Maryland |
| NGR | Blue Cross Blue Shield of Michigan |
| NGS | Anthem Blue Cross Blue Shield of Virginia |
| NGT | Blue Shield of California |
| NGU | Blue Cross Blue Shield of Western New York |
| NGV | Anthem Blue Cross Blue Shield of Ohio |
| NGW | Blue Shield of California |
| NGX | Blue Cross Blue Shield of Illinois |
| NGY | Blue Cross Blue Shield of Massachusetts |
| NGZ | Wellmark Blue Cross Blue Shield |
| NHA | Anthem Blue Cross Blue Shield of New Hampshire |
| NHB | Blue Cross Blue Shield of Alabama |
| NHC | Blue Cross Blue Shield of Tennessee |
| NHD | Anthem Blue Cross Blue Shield of Ohio |
| NHE | Anthem Blue Cross of California |
| NHF | Blue Cross Blue Shield of Alabama |
| NHG | Capital Blue Cross |
| NHH | Blue Shield of California |
| NHI | Blue Cross Blue Shield of Massachusetts |
| NHJ | Highmark Blue Cross Blue Shield |
| NHK | Highmark Blue Cross Blue Shield |
| NHL | Horizon Blue Cross Blue Shield of New Jersey |
| NHM | Blue Cross Blue Shield of Massachusetts |
| NHN | Anthem Blue Cross Blue Shield of New Hampshire |
| NHO | Blue Shield of California |
| NHP | Anthem Blue Cross Blue Shield of New Hampshire |
| NHQ | Carefirst Administrators |
| NHR | Blue Cross Blue Shield of Minnesota |
| NHS | Carefirst Blue Cross Blue Shield of Maryland |
| NHT | Blue Cross Blue Shield of Michigan |
| NHU | Capital Blue Cross |
| NHV | Horizon Blue Cross Blue Shield of New Jersey |
| NHW | Blue Cross Blue Shield of Kansas City |
| NHX | Horizon Blue Cross Blue Shield of New Jersey |
| NHY | Blue Cross Blue Shield of Arizona |
| NHZ | No Prefix Assigned |
| NIA | Anthem Blue Cross Blue Shield of Wisconsin |
| NIB | No Prefix Assigned |
| NIC | Anthem Blue Cross of California |
| NID | Regence Blue Cross Blue Shield |
| NIE | Anthem Blue Cross Blue Shield of California |
| NIF | No Prefix Assigned |
| NIG | No Prefix Assigned |
| NIH | Blue Cross Blue Shield of Massachusetts |
| NII | Horizon Blue Cross Blue Shield of New Jersey |
| NIJ | Anthem Blue Cross Blue Shield of Ohio |
| NIK | No Prefix Assigned |
| NIL | Anthem Blue Cross of California |
| NIM | Wellmark Blue Cross Blue Shield |
| NIN | Blue Cross Blue Shield of Nebraska |
| NIO | Wellmark Blue Cross Blue Shield |
| NIP | Blue Shield of California |
| NIQ | Anthem Blue Cross Blue Shield of Ohio |
| NIR | Independence Blue Cross |
| NIS | No Prefix Assigned |
| NIT | Blue Cross Blue Shield of Georgia |
| NIU | Blue Cross Blue Shield of Florida |
| NIV | Anthem Blue Cross of California |
| NIW | Empire Blue Cross Blue Shield of New York |
| NIX | Empire Blue Cross Blue Shield of New York |
| NIY | Blue Cross Blue Shield of Kansas City |
| NIZ | Blue Shield of California |
| NJA | Anthem Blue Cross Blue Shield of Georgia |
| NJB | Highmark Blue Cross Blue Shield |
| NJC | Anthem Blue Cross Blue Shield of Ohio |
| NJD | Horizon Blue Cross Blue Shield of New Jersey |
| NJE | Horizon Blue Cross Blue Shield of New Jersey |
| NJF | Blue Cross Blue Shield of Illinois |
| NJG | Blue Cross Blue Shield of Texas |
| NJH | Horizon Blue Cross Blue Shield of New Jersey |
| NJI | Horizon Blue Cross Blue Shield of New Jersey |
| NJJ | Horizon Blue Cross Blue Shield of New Jersey |
| NJK | Anthem Blue Cross Blue Shield of Ohio |
| NJL | Blue Cross Blue Shield of Michigan |
| NJM | Anthem Blue Cross of California |
| NJN | Horizon Blue Cross Blue Shield of New Jersey |
| NJO | Horizon Blue Cross Blue Shield of New Jersey |
| NJP | Horizon Blue Cross Blue Shield of New Jersey |
| NJQ | Blue Cross Blue Shield of South Carolina |
| NJR | Horizon Blue Cross Blue Shield of New Jersey |
| NJS | Horizon Blue Cross Blue Shield of New Jersey |
| NJT | Horizon Blue Cross Blue Shield of New Jersey |
| NJU | Blue Cross Blue Shield of Illinois |
| NJV | Blue Cross Blue Shield of Michigan |
| NJW | No Prefix Assigned |
| NJX | Horizon Blue Cross Blue Shield of New Jersey |
| NJY | Blue Cross Blue Shield of Alabama |
| NJZ | Wellmark Blue Cross Blue Shield |
| NKA | Blue Cross Blue Shield of Minnesota |
| NKB | Anthem Blue Cross of California |
| NKC | No Prefix Assigned |
| NKD | No Prefix Assigned |
| NKE | Anthem Blue Cross Blue Shield of Ohio |
| NKF | Blue Cross Blue Shield of Alabama |
| NKG | Horizon Blue Cross Blue Shield of New Jersey |
| NKH | Horizon Blue Cross Blue Shield of New Jersey |
| NKI | Anthem Blue Cross Blue Shield of Ohio |
| NKJ | Blue Cross Blue Shield of Michigan |
| NKK | Blue Cross Blue Shield of Michigan |
| NKL | Blue Cross Blue Shield of Illinois |
| NKM | Blue Cross Blue Shield of Tennessee |
| NKN | Anthem Blue Cross of California |
| NKO | Horizon Blue Cross Blue Shield of New Jersey |
| NKP | Carefirst Blue Cross Blue Shield of Maryland |
| NKQ | Blue Cross Blue Shield of Michigan |
| NKR | Anthem Blue Cross Blue Shield of Indiana |
| NKS | Blue Cross Blue Shield of Michigan |
| NKT | Blue Cross Blue Shield of Illinois |
| NKU | Carefirst Blue Cross Blue Shield of Maryland |
| NKV | Blue Cross Blue Shield of Massachusetts |
| NKW | Anthem Blue Cross Blue Shield of Ohio |
| NKX | Blue Cross Blue Shield of Tennessee |
| NKY | Blue Cross Blue Shield of Michigan |
| NKZ | No Prefix Assigned |
| NLA | Blue Cross Blue Shield of Michigan |
| NLB | Blue Cross Blue Shield of Illinois |
| NLC | Blue Cross Blue Shield of Kansas City |
| NLD | Horizon Blue Cross Blue Shield of New Jersey |
| NLE | Horizon Blue Cross Blue Shield of New Jersey |
| NLF | No Prefix Assigned |
| NLG | Horizon Blue Cross Blue Shield of New Jersey |
| NLH | Blue Cross Blue Shield of Michigan |
| NLI | Blue Cross Blue Shield of Alabama |
| NLJ | Carefirst Blue Cross Blue Shield of Maryland |
| NLK | Anthem Blue Cross Blue Shield of Ohio |
| NLL | Blue Cross Blue Shield of Illinois |
| NLM | Highmark Blue Cross Blue Shield |
| NLN | Highmark Blue Cross Blue Shield |
| NLO | Carefirst Blue Cross Blue Shield of Maryland |
| NLP | Blue Shield of California |
| NLQ | Premera Blue Cross |
| NLR | Blue Cross Blue Shield of Texas |
| NLS | Horizon Blue Cross Blue Shield of New Jersey |
| NLT | Blue Cross Blue Shield of Texas |
| NLU | Blue Cross Blue Shield of Massachusetts |
| NLV | Carefirst Blue Cross Blue Shield of Maryland |
| NLW | Blue Cross Blue Shield of Illinois |
| NLX | Premera Blue Cross |
| NLY | No Prefix Assigned |
| NLZ | Premera Blue Cross |
| NMA | Blue Cross Blue Shield of South Carolina |
| NMB | No Prefix Assigned |
| NMC | Wellmark Blue Cross Blue Shield |
| NMD | Blue Cross Blue Shield of Kansas City |
| NME | Blue Cross Blue Shield of Georgia |
| NMF | Blue Cross Blue Shield of South Carolina |
| NMG | Blue Cross Blue Shield of South Carolina |
| NMH | Anthem Blue Cross Blue Shield of Ohio |
| NMI | Regence Blue Cross Blue Shield |
| NMJ | Blue Cross Blue Shield of New Mexico |
| NMK | Blue Cross Blue Shield of New Mexico |
| NML | Blue Cross Blue Shield of South Carolina |
| NMM | Blue Cross Blue Shield of New Mexico |
| NMN | Blue Cross Blue Shield of Minnesota |
| NMO | Horizon Blue Cross Blue Shield of New Jersey |
| NMP | Blue Cross Blue Shield of Illinois |
| NMQ | No Prefix Assigned |
| NMR | Horizon Blue Cross Blue Shield of New Jersey |
| NMS | Carefirst Blue Cross Blue Shield of Maryland |
| NMT | Blue Cross Blue Shield of Illinois |
| NMU | Blue Cross Blue Shield of Tennessee |
| NMV | Empire Blue Cross Blue Shield of New York |
| NMW | Blue Cross Blue Shield of Illinois |
| NMX | Anthem Blue Cross Blue Shield of Colorado |
| NMY | Anthem Blue Cross Blue Shield of New Hampshire |
| NMZ | No Prefix Assigned |
| NNA | Blue Cross Blue Shield of Tennessee |
| NNB | Blue Cross Blue Shield of Tennessee |
| NNC | Blue Cross Idaho |
| NND | Blue Cross Blue Shield of Massachusetts |
| NNE | Blue Cross Blue Shield of Massachusetts |
| NNF | Blue Cross Blue Shield of Western New York |
| NNG | Blue Cross Blue Shield of Arizona |
| NNH | Anthem Blue Cross Blue Shield of Virginia |
| NNI | Horizon Blue Cross Blue Shield of New Jersey |
| NNJ | Blue Cross Blue Shield of Arizona |
| NNK | Premera Blue Cross |
| NNL | No Prefix Assigned |
| NNM | No Prefix Assigned |
| NNN | Blue Cross Blue Shield of Illinois |
| NNO | Blue Cross Blue Shield of North Carolina |
| NNP | Blue Cross Blue Shield of Illinois |
| NNQ | Premera Blue Cross |
| NNR | Highmark Blue Cross Blue Shield |
| NNS | Anthem Blue Cross Blue Shield of Virginia |
| NNT | Premera Blue Cross |
| NNU | Blue Cross of Northeast Pennsylvania |
| NNV | Wellmark Blue Cross Blue Shield |
| NNW | Blue Cross Blue Shield of Montana |
| NNX | Highmark Blue Cross Blue Shield |
| NNY | Premera Blue Cross |
| NNZ | Anthem Blue Cross Blue Shield of Virginia |
| NOA | Blue Cross Blue Shield of North Dakota |
| NOB | Horizon Blue Cross Blue Shield of New Jersey |
| NOC | Horizon Blue Cross Blue Shield of New Jersey |
| NOD | Horizon Blue Cross Blue Shield of New Jersey |
| NOE | Anthem Blue Cross of California |
| NOF | Blue Cross Blue Shield of Michigan |
| NOG | Blue Cross Blue Shield of Michigan |
| NOH | Anthem Blue Cross Blue Shield of Colorado |
| NOI | Anthem Blue Cross Blue Shield of Ohio |
| NOJ | No Prefix Assigned |
| NOK | No Prefix Assigned |
| NOL | Independence Blue Cross |
| NOM | No Prefix Assigned |
| NON | Blue Cross Blue Shield of North Carolina |
| NOO | Wellmark Blue Cross Blue Shield |
| NOP | Blue Cross Blue Shield of North Dakota |
| NOQ | Blue Cross of Idaho |
| NOR | Blue Cross Blue Shield of Arizona |
| NOS | Anthem Blue Cross of California |
| NOT | Anthem Blue Cross Blue Shield of Ohio |
| NOU | Anthem Blue Cross of California |
| NOV | Horizon Blue Cross Blue Shield of New Jersey |
| NOW | Blue Shield of California |
| NOX | No Prefix Assigned |
| NOY | Blue Shield of California |
| NOZ | Blue Cross of Idaho |
| NPA | Carefirst Administrators |
| NPB | Regence Blue Cross Blue Shield of Oregon |
| NPC | Blue Cross Blue Shield of South Carolina |
| NPD | Blue Cross Blue Shield of Nebraska |
| NPE | Blue Cross Blue Shield of Minnesota |
| NPF | Carefirst Blue Cross Blue Shield of Maryland |
| NPG | Carefirst Blue Cross Blue Shield of Maryland |
| NPH | Horizon Blue Cross Blue Shield of New Jersey |
| NPI | Blue Cross Blue Shield of Michigan |
| NPJ | Blue Cross Blue Shield of Florida |
| NPK | Blue Cross Blue Shield of Michigan |
| NPL | Anthem Blue Cross of California |
| NPM | Carefirst Blue Cross Blue Shield of Maryland |
| NPN | No Prefix Assigned |
| NPO | Blue Shield of California |
| NPP | Independence Blue Cross |
| NPQ | Blue Cross of Idaho |
| NPR | Blue Cross Blue Shield of Illinois |
| NPS | Carefirst Blue Cross Blue Shield of Maryland |
| NPT | Blue Cross Blue Shield of Alabama |
| NPU | Empire Blue Cross Blue Shield of New York |
| NPV | Regence Blue Cross Blue Shield |
| NPW | No Prefix Assigned |
| NPX | Blue Cross Blue Shield of Rhose Island |
| NPY | Empire Blue Cross Blue Shield of New York |
| NPZ | Blue Cross of Idaho |
| NQA | Blue Cross Blue Shield of Massachusetts |
| NQB | Blue Cross of Idaho |
| NQC | Regence Blue Cross Blue Shield |
| NQD | Blue Cross Blue Shield of Western New York |
| NQE | No Prefix Assigned |
| NQF | Premera Blue Cross |
| NQG | Blue Cross Blue Shield of Michigan |
| NQH | Blue Cross Blue Shield of Illinois |
| NQI | Blue Cross Blue Shield of Michigan |
| NQJ | No Prefix Assigned |
| NQK | Blue Cross of Idaho |
| NQL | Blue Cross Blue Shield of Massachusetts |
| NQM | Anthem Blue Cross Blue Shield of Colorado |
| NQN | Premera Blue Cross |
| NQO | No Prefix Assigned |
| NQP | Blue Cross Blue Shield of Western New York |
| NQQ | Blue Cross Blue Shield of Minnesota |
| NQR | Blue Cross Blue Shield of Massachusetts |
| NQS | Blue Cross Blue Shield of Illinois |
| NQT | Blue Cross Blue Shield of Michigan |
| NQU | Blue Cross Blue Shield of Michigan |
| NQV | Blue Cross Blue Shield of Massachusetts |
| NQW | Blue Cross Blue Shield of Minnesota |
| NQX | Blue Cross Blue Shield of Massachusetts |
| NQY | Anthem Blue Cross of California |
| NQZ | No Prefix Assigned |
| NRA | Blue Cross Blue Shield of Minnesota |
| NRB | Premera Blue Cross |
| NRC | Blue Cross Blue Shield of Minnesota |
| NRD | Capital Blue Cross |
| NRE | Capital Blue Cross |
| NRF | Blue Cross Blue Shield of Illinois |
| NRG | Blue Cross Blue Shield of Illinois |
| NRH | Premera Blue Cross |
| NRI | Blue Cross Blue Shield of Nebraska |
| NRJ | Anthem Blue Cross of California |
| NRK | Anthem Blue Cross of California |
| NRL | Premera Blue Cross |
| NRM | Carefirst Blue Cross Blue Shield of Maryland |
| NRN | Blue Cross Blue Shield of Nebraska |
| NRO | Blue Cross Blue Shield of Georgia |
| NRP | No Prefix Assigned |
| NRQ | Horizon Blue Cross Blue Shield of New Jersey |
| NRR | Anthem Blue Cross of California |
| NRS | Premera Blue Cross |
| NRT | Anthem Blue Cross of California |
| NRU | Anthem Blue Cross Blue Shield of Ohio |
| NRV | No Prefix Assigned |
| NRW | Horizon Blue Cross Blue Shield of New Jersey |
| NRX | Anthem Blue Cross Blue Shield of Colorado |
| NRY | No Prefix Assigned |
| NRZ | No Prefix Assigned |
| NSA | Anthem Blue Cross of California |
| NSB | Blue Shield of California |
| NSC | Blue Shield of California |
| NSD | Blue Cross Blue Shield of Michigan |
| NSE | Blue Shield of California |
| NSF | No Prefix Assigned |
| NSG | Horizon Blue Cross Blue Shield of New Jersey |
| NSH | Carefirst Blue Cross Blue Shield of Maryland |
| NSI | Horizon Blue Cross Blue Shield of New Jersey |
| NSJ | Horizon Blue Cross Blue Shield of New Jersey |
| NSK | Horizon Blue Cross Blue Shield of New Jersey |
| NSL | Blue Shield of California |
| NSM | Wellmark Blue Cross Blue Shield |
| NSN | Blue Shield of California |
| NSO | Excellus Blue Cross Blue Shield of New York |
| NSP | Horizon Blue Cross Blue Shield of New Jersey |
| NSQ | Wellmark Blue Cross Blue Shield |
| NSR | Blue Cross of Idaho |
| NSS | Blue Cross Blue Shield of Michigan |
| NST | Blue Cross Blue Shield of Texas |
| NSU | Anthem Blue Cross Blue Shield of Ohio |
| NSV | Wellmark Blue Cross Blue Shield |
| NSW | Regence Blue Cross Blue Shield |
| NSX | Regence Blue Cross Blue Shield of Utah |
| NSY | Horizon Blue Cross Blue Shield of New Jersey |
| NSZ | Blue Cross Blue Shield of Tennessee |
| NTA | Anthem Blue Cross Blue Shield of New Hampshire |
| NTB | Blue Cross Blue Shield of Michigan |
| NTC | Blue Cross Blue Shield of Georgia |
| NTD | Blue Cross Blue Shield of Massachusetts |
| NTE | Premera Blue Cross |
| NTF | Premera Blue Cross |
| NTG | No Prefix Assigned |
| NTH | Blue Cross Blue Shield of Minnesota |
| NTI | Wellmark Blue Cross Blue Shield |
| NTJ | Blue Cross of Northeast Pennsylvania |
| NTK | Blue Cross Blue Shield of Texas |
| NTL | Blue Cross Blue Shield of Alabama |
| NTM | Blue Cross Blue Shield of Illinois |
| NTN | Anthem Blue Cross of California |
| NTO | Wellmark Blue Cross Blue Shield |
| NTP | Empire Blue Cross Blue Shield of New York |
| NTQ | Blue Cross of Northeast Pennsylvania |
| NTR | Horizon Blue Cross Blue Shield of New Jersey |
| NTS | Anthem Blue Cross Blue Shield of Ohio |
| NTT | Regence Blue Cross Blue Shield of Oregon |
| NTU | Blue Cross Blue Shield of Alabama |
| NTV | Blue Shield of California |
| NTW | Horizon Blue Cross Blue Shield of New Jersey |
| NTX | Blue Shield of California |
| NTY | Blue Cross Blue Shield of North Carolina |
| NTZ | Blue Cross Blue Shield of Massachusetts |
| NUA | Anthem Blue Cross Blue Shield of Ohio |
| NUB | Highmark Blue Cross Blue Shield of West Virginia |
| NUC | Blue Cross Blue Shield of Illinois |
| NUD | Blue Cross Blue Shield of Nebraska |
| NUE | Blue Cross Blue Shield of Kansas City |
| NUF | Horizon Blue Cross Blue Shield of New Jersey |
| NUG | Anthem Blue Cross Blue Shield of Ohio |
| NUH | Horizon Blue Cross Blue Shield of New Jersey |
| NUI | Regence Blue Cross Blue Shield |
| NUJ | Premera Blue Cross |
| NUK | Blue Cross Blue Shield of Texas |
| NUL | No Prefix Assigned |
| NUM | Carefirst Blue Cross Blue Shield of Maryland |
| NUN | Independence Blue Cross |
| NUO | Blue Cross Blue Shield of Michigan |
| NUP | Blue Cross Blue Shield of Massachusetts |
| NUQ | Blue Cross Blue Shield of Massachusetts |
| NUR | Anthem Blue Cross Blue Shield of Indiana |
| NUS | Blue Cross of Idaho |
| NUT | Blue Cross Blue Shield of South Carolina |
| NUU | Blue Cross Blue Shield of Illinois |
| NUV | Blue Cross Blue Shield of Illinois |
| NUW | Anthem Blue Cross of California |
| NUX | Capital Blue Cross |
| NUY | Anthem Blue Cross Blue Shield of Connecticut |
| NUZ | Regence Blue Shield of Idaho |
| NVA | No Prefix Assigned |
| NVB | Blue Cross Blue Shield of Massachusetts |
| NVC | Regence Blue Shield of Idaho |
| NVD | Blue Cross Blue Shield of Illinois |
| NVE | Wellmark Blue Cross Blue Shield |
| NVF | Carefirst Blue Cross Blue Shield of Maryland |
| NVG | Blue Cross Blue Shield of Michigan |
| NVH | Premera Blue Cross |
| NVI | Blue Cross Blue Shield of Minnesota |
| NVJ | Anthem Blue Cross Blue Shield of Wisconsin |
| NVK | Blue Cross Blue Shield of Illinois |
| NVL | Blue Cross Blue Shield of Texas |
| NVM | Wellmark Blue Cross Blue Shield |
| NVN | No Prefix Assigned |
| NVO | Independence Blue Cross |
| NVP | Horizon Blue Cross Blue Shield of New Jersey |
| NVQ | Independence Blue Cross |
| NVR | Anthem Blue Cross Blue Shield of Ohio |
| NVS | Blue Cross Blue Shield of Alabama |
| NVT | Blue Cross Blue Shield of Florida |
| NVU | Premera Blue Cross |
| NVV | Blue Cross Blue Shield of Illinois |
| NVW | No Prefix Assigned |
| NVX | Blue Cross Blue Shield of Illinois |
| NVY | Horizon Blue Cross Blue Shield of New Jersey |
| NVZ | Blue Cross Blue Shield of Florida |
| NWA | No Prefix Assigned |
| NWB | Premera Blue Cross |
| NWC | Blue Cross Blue Shield of South Carolina |
| NWD | Anthem Blue Cross Blue Shield of Colorado |
| NWE | Wellmark Blue Cross Blue Shield |
| NWF | Capital Blue Cross |
| NWG | Anthem Blue Cross Blue Shield of Georgia |
| NWH | Regence Blue Shield of Washington |
| NWI | Blue Cross Blue Shield of Massachusetts |
| NWJ | No Prefix Assigned |
| NWK | Blue Cross Blue Shield of Rhose Island |
| NWL | Blue Cross Blue Shield of South Carolina |
| NWM | No Prefix Assigned |
| NWN | Blue Cross Blue Shield of Georgia |
| NWO | No Prefix Assigned |
| NWP | Blue Cross Blue Shield of Minnesota |
| NWQ | Anthem Blue Cross Blue Shield of Georgia |
| NWR | Regence Blue Cross Blue Shield |
| NWS | Carefirst Administrators |
| NWT | Carefirst Blue Cross Blue Shield of Maryland |
| NWU | Blue Cross Blue Shield of Rhose Island |
| NWV | Premera Blue Cross |
| NWW | Wellmark Blue Cross Blue Shield |
| NWX | Blue Cross of Idaho |
| NWY | Blue Cross Blue Shield of Rhode Island |
| NWZ | Blue Cross of Idaho |
| NXA | Blue Cross Blue Shield of Western New York |
| NXB | Anthem Blue Cross Blue Shield of Connecticut |
| NXC | Anthem Blue Cross of California |
| NXD | Blue Cross Blue Shield of Nebraska |
| NXE | Anthem Blue Cross Blue Shield of Ohio |
| NXF | No Prefix Assigned |
| NXG | Blue Cross Blue Shield of Arizona |
| NXH | Blue Shield of California |
| NXI | Carefirst Blue Cross Blue Shield of Maryland |
| NXJ | No Prefix Assigned |
| NXK | Carefirst Blue Cross Blue Shield of Maryland |
| NXL | Premera Blue Cross |
| NXM | Blue Cross Blue Shield of Texas |
| NXN | Blue Cross of Idaho |
| NXO | Blue Shield of Northeastern New York |
| NXP | Blue Shield of California |
| NXQ | Blue Cross Blue Shield of Illinois |
| NXR | Blue Cross Blue Shield of North Carolina |
| NXS | Anthem Blue Cross Blue Shield of Ohio |
| NXT | Premera Blue Cross |
| NXU | Empire Blue Cross Blue Shield of New York |
| NXV | Anthem Blue Cross Blue Shield of Nevada |
| NXW | Premera Blue Cross |
| NXX | Premera Blue Cross |
| NXY | No Prefix Assigned |
| NXZ | Blue Cross Blue Shield of Georgia |
| NYA | Empire Blue Cross Blue Shield of New York |
| NYB | Empire Blue Cross Blue Shield of New York |
| NYC | Empire Blue Cross Blue Shield of New York |
| NYD | Empire Blue Cross Blue Shield of New York |
| NYE | Blue Shield of Northeastern New York |
| NYF | Blue Shield of Northeastern New York |
| NYG | Empire Blue Cross Blue Shield of New York |
| NYH | Empire Blue Cross Blue Shield of New York |
| NYI | Empire Blue Cross Blue Shield of New York |
| NYJ | Blue Cross Blue Shield of Tennessee |
| NYK | Blue Cross Blue Shield of Texas |
| NYL | Carefirst Blue Cross Blue Shield of Maryland |
| NYM | Horizon Blue Cross Blue Shield of New Jersey |
| NYN | No Prefix Assigned |
| NYO | Empire Blue Cross Blue Shield of New York |
| NYP | Anthem Blue Cross Blue Shield of Missouri |
| NYQ | Blue Cross Blue Shield of Georgia |
| NYR | Blue Cross Blue Shield of Tennessee |
| NYS | No Prefix Assigned |
| NYT | Independence Blue Cross |
| NYU | Carefirst Blue Cross Blue Shield of Maryland |
| NYV | No Prefix Assigned |
| NYW | Blue Cross Blue Shield of Illinois |
| NYX | Blue Cross Blue Shield of Alabama |
| NYY | Empire Blue Cross Blue Shield of New York |
| NYZ | Blue Cross Blue Shield of Texas |
| NZA | Blue Cross Blue Shield of Illinois |
| NZB | Blue Cross Blue Shield of South Carolina |
| NZC | Blue Cross Blue Shield of South Carolina |
| NZD | No Prefix Assigned |
| NZE | No Prefix Assigned |
| NZF | Blue Cross Blue Shield of Tennessee |
| NZG | Blue Cross Blue Shield of South Carolina |
| NZH | Blue Cross Blue Shield of Michigan |
| NZI | Blue Cross Blue Shield of Arizona |
| NZJ | Anthem Blue Cross of California |
| NZK | Independence Blue Cross |
| NZL | Wellmark Blue Cross Blue Shield |
| NZM | Anthem Blue Cross Blue Shield of Georgia |
| NZN | Blue Cross Blue Shield of South Carolina |
| NZO | Blue Cross Blue Shield of Michigan |
| NZP | Blue Cross Blue Shield of South Carolina |
| NZQ | Blue Cross Blue Shield of Michigan |
| NZR | Anthem Blue Cross Blue Shield of Virginia |
| NZS | Regence Blue Cross Blue Shield |
| NZT | Blue Cross Blue Shield of South Carolina |
| NZU | Blue Cross Blue Shield of Nebraska |
| NZV | Wellmark Blue Cross Blue Shield |
| NZW | Blue Cross Blue Shield of Tennessee |
| NZX | Horizon Blue Cross Blue Shield of New Jersey |
| NZY | Blue Cross Blue Shield of Illinois |
| NZZ | Wellmark Blue Cross Blue Shield |
| N2D | Premera Blue Cross |
| N3T | Premera Blue Cross |
| N4S | Premera Blue Cross |
| N6P | Premera Blue Cross |
| N8P | Premera Blue Cross |
