BCBS Prefix Lookup MAA – MZZ
List of BCBS Prefixes MAA to MZZ
This list of bcbs prefixes includes both alpha prefixes and alpha numeric prefixes. We continue to add additional prefixes as we find them along with the blue cross blue shield provider phone number. Remember that each table has a search box at the top so it’s not necessary to page through the list of bc prefixes to find the one you need. Just enter the bc prefix in the search box to find it quickly. We appreciate your patience and support as we update our bcbs prefix lists.
| Prefix | Plan Name |
|---|---|
| M2C | Blue Cross Blue Shield of Illinois |
| M2D | Blue Cross Blue Shield of Illinois |
| M2E | Blue Cross Blue Shield of Texas |
| M2F | Blue Cross Blue Shield of Texas |
| M2G | Blue Cross Blue Shield of Texas |
| M2H | Regence Blue Cross Blue Shield of Oregon |
| M2I | BCBS of Western New York |
| M2J | Blue Cross Blue Shield of Illinois |
| M2K | BCBS of Arizona |
| M2L | Blue Cross Blue Shield of Massachusetts |
| M2N | Anthem BCBS of Wisconsin |
| M2P | Regence Blue Cross Blue Shield of Oregon |
| M2Q | Anthem BCBS of Wisconsin |
| M2R | Blue Cross Blue Shield of Texas |
| M2S | Blue Cross Blue Shield of Illinois |
| M2T | Regence Blue Cross Blue Shield of Oregon |
| M2U | Anthem BCBS of Wisconsin |
| M2V | BCBS if Arizona |
| M2W | Blue Cross Blue Shield of Rhode Island |
| M2X | Blue Cross Blue Shield of Illinois |
| M2Y | Regence Blue Cross Blue Shield of Oregon |
| M3A | BCBS of Kansas |
| M3B | BCBS of Western New York |
| M3C | Blue Cross Blue Shield of Rhode Island |
| M3D | Regence Blue Cross Blue Shield of Oregon |
| M3E | Blue Cross Blue Shield of Illinois |
| M3F | Blue Cross Blue Shield of Texas |
| M3G | Blue Cross Blue Shield of Rhode Island |
| M3H | Blue Cross Blue Shield of Minnesota |
| M3J | Empire Blue Cross Blue Shield |
| M3K | Anthem BCBS of Wisconsin |
| M3L | Blue Cross Blue Shield of Michigan |
| M3M | Regence Blue Cross Blue Shield of Oregon |
| M3P | BCBS of Arizona |
| M3R | Blue Cross Blue Shield of Texas |
| M3S | Blue Cross Blue Shield of Illinois |
| M3T | Anthem BCBS of Georgia |
| M3U | Anthem BCBS of Indiana |
| M3V | BCBS of Arizona |
| M3W | Regence Blue Cross Blue Shield of Oregon |
| M3X | Anthem BCBS of Wisconsin |
| M3Y | Anthem BCBS of Georgia |
| M3Z | Anthem BCBS of Georgia |
| M4A | Highmark BCBS of Pennsylvania |
| M4B | Highmark BCBS of Pennsylvania |
| M4C | Anthem BCBS of Kentucky |
| M4D | Regence Blue Cross Blue Shield of Oregon |
| M4F | Blue Cross Blue Shield of Texas |
| M4G | Anthem BCBS of Virginia |
| M4H | Anthem BCBS of Missouri |
| M4L | Highmark BCBS of Pennsylvania |
| M4M | Anthem BCBS of Missouri |
| M4N | Anthem BCBS of Virginia |
| M4P | Blue Cross Blue Shield of Texas |
| M4Q | Blue Cross Blue Shield of Michigan |
| M4R | Blue Shield of Northeastern New York |
| M4S | Blue Cross Blue Shield of Illinois |
| M4T | Regence Blue Cross Blue Shield of Oregon |
| M4U | Blue Cross Blue Shield of Minnesota |
| M4Y | Blue Cross of Idaho |
| M5A | Blue Cross Blue Shield of Minnesota |
| M5C | Anthem BCBS of Missouri |
| M5D | Anthem BCBS of Missouri |
| M5E | Anthem BCBS of Missouri |
| M5F | Blue Cross Blue Shield of Texas |
| M5K | Blue Cross Blue Shield of Illinois |
| M5M | Blue Cross Blue Shield of Texas |
| M5R | BCBS of Western New York |
| M5X | Blue Cross Blue Shield of Illinois |
| M6A | Blue Cross Blue Shield of Texas |
| M6C | Empire Blue Cross Blue Shield |
| M6F | Blue Cross Blue Shield of Texas |
| M6S | Blue Cross Blue Shield of Illinois |
| M6U | Anthem BCBS of Ohio |
| M7A | Blue Cross of California |
| M7B | Premera Blue Cross |
| M7C | Empire Blue Cross Blue Shield |
| M7D | Blue Cross Blue Shield of North Dakota |
| M7E | Blue Cross of California |
| M7F | Blue Cross Blue Shield of Texas |
| M7M | Anthem BCBS of Colorado |
| M7S | Blue Cross Blue Shield of Illinois |
| M7V | Anthem BCBS of Missouri |
| M7W | Anthem BCBS of Indiana |
| M7X | Anthem BCBS of Kentucky |
| M8A | Anthem BCBS of Colorado |
| M8F | Blue Cross Blue Shield of Texas |
| M8H | Empire Blue Cross Blue Shield |
| M8S | Blue Cross Blue Shield of Illinois |
| M8W | Anthem BCBS of Maine |
| M8X | Anthem BCBS of New Hampshire |
| M8Z | Unassigned Prefix |
| M9A | Empire Blue Cross Blue Shield |
| M9C | Empire Blue Cross Blue Shield |
| M9F | Blue Cross Blue Shield of Texas |
| M9N | Blue Cross of California |
| M9S | Blue Cross Blue Shield of Illinois |
| M9T | Blue Cross Blue Shield of Texas |
| M9X | Unassigned Prefix |
| MAA | Premera Blue Cross |
| MAB | BCBS of Florida |
| MAC | BCBS of Minnesota |
| MAD | Premera Blue Cross |
| MAE | Anthem BCBS of Ohio |
| MAF | Carefirst BCBS of Maryland |
| MAG | BCBS of New Mexico |
| MAH | Anthem BCBS of Virginia |
| MAI | Wellmark BCBS |
| MAJ | Blue Shield of California |
| MAK | Anthem BCBS of Kentucky |
| MAL | Carefirst BCBS of Maryland |
| MAM | Carefirst BCBS |
| MAN | Carefirst BCBS of Maryland |
| MAO | BCBS of South Carolina |
| MAP | Anthem BCBS of Colorado |
| MAQ | BCBS of Florida |
| MAR | Anthem BCBS of Georgia |
| MAS | Anthem BCBS of Georgia |
| MAT | BCBS of Texas |
| MAU | Wellmark BCBS |
| MAV | Anthem BCBS of Ohio |
| MAW | Carefirst BCBS of Maryland |
| MAX | BCBS of Illinois |
| MAY | BCBS of Nebraska |
| MAZ | Wellmark BCBS |
| MBA | Anthem BCBS of Ohio |
| MBB | Anthem BCBS of Colorado |
| MBC | BCBS of Tennessee |
| MBD | Carefirst BCBS of Maryland |
| MBE | BCBS of South Carolina |
| MBF | Anthem Blue Cross of California |
| MBG | BCBS of Alabama |
| MBH | BCBS of Alabama |
| MBI | BCBS of Michigan |
| MBJ | Regence Blue Shield of Washington |
| MBK | Empire BCBS of New York |
| MBL | Anthem Blue Cross of California |
| MBM | BCBS of Illinois |
| MBN | BCBS of Michigan |
| MBO | BCBS of Florida |
| MBP | Anthem BCBS of Indiana |
| MBQ | Wellmark BCBS |
| MBR | Anthem Blue Cross of California |
| MBS | Carefirst BCBS |
| MBT | Anthem BCBS of Missouri |
| MBU | BCBS of Massachusetts |
| MBV | Carefirst BCBS of Maryland |
| MBW | Anthem BCBS of Ohio |
| MBX | Unassigned Prefix |
| MBY | Unassigned Prefix |
| MBZ | Carefirst BCBS of Maryland |
| MCA | Blue Shield of California |
| MCB | Unassigned Prefix |
| MCC | BCBS of Texas |
| MCD | BCBS of Illinois |
| MCE | Premera Blue Cross |
| MCF | Carefirst BCBS of Maryland |
| MCG | Carefirst BCBS of Maryland |
| MCH | BCBS of Florida |
| MCI | Anthem Blue Cross of California |
| MCJ | Highmark BCBS |
| MCK | Wellmark BCBS |
| MCL | Wellmark BCBS |
| MCM | Premera Blue Cross |
| MCN | BCBS of Kansas City |
| MCO | Anthem BCBS of Virginia |
| MCP | Unassigned Prefix |
| MCQ | BCBS of Illinois |
| MCR | Carefirst BCBS of Maryland |
| MCS | Carefirst BCBS of Maryland |
| MCT | Wellmark BCBS |
| MCU | Anthem Blue Cross of California |
| MCV | Wellmark BCBS |
| MCW | Wellmark BCBS |
| MCX | BCBS of Massachusetts |
| MCY | Highmark BCBS |
| MCZ | Anthem BCBS of Ohio |
| MDA | BCBS of Michigan |
| MDB | BCBS of Alabama |
| MDC | BCBS of Minnesota |
| MDD | BCBS of Georgia |
| MDE | Anthem Blue Cross of California |
| MDF | Independence Blue Cross |
| MDG | BCBS of Michigan |
| MDH | BCBS of Rhose Island |
| MDI | Wellmark BCBS |
| MDJ | Anthem BCBS of Indiana |
| MDK | BCBS of Arizona |
| MDL | BCBS of Illinois |
| MDM | Carefirst BCBS of Maryland |
| MDN | Anthem BCBS of Wisconsin |
| MDO | Wellmark BCBS |
| MDP | Blue Shield of California |
| MDQ | BCBS of Minnesota |
| MDR | Anthem BCBS of Wisconsin |
| MDS | Carefirst BCBS of Maryland |
| MDT | Carefirst Administrators |
| MDU | Wellmark BCBS |
| MDV | BCBS of Illinois |
| MDW | Wellmark BCBS |
| MDX | BCBS of Alabama |
| MDY | BCBS of Kansas City |
| MDZ | BCBS of Minnesota |
| MEA | Blue Shield of California |
| MEB | Unassigned Prefix |
| MEC | Anthem BCBS of Virginia |
| MED | Anthem BCBS of Ohio |
| MEE | BCBS of Massachusetts |
| MEF | Carefirst BCBS of Maryland |
| MEG | Anthem BCBS of Georgia |
| MEH | Carefirst BCBS of Maryland |
| MEI | BCBS of Michigan |
| MEJ | Carefirst BCBS of Maryland |
| MEK | Blue Shield of California |
| MEL | Wellmark BCBS |
| MEM | Wellmark BCBS |
| MEN | Anthem BCBS of Maine |
| MEO | Blue Shield of California |
| MEP | Anthem BCBS of Maine |
| MEQ | Blue Shield of California |
| MER | Anthem BCBS of Wisconsin |
| MES | BCBS of Illinois |
| MET | BCBS of Nebraska |
| MEU | BCBS of Texas |
| MEV | Unassigned Prefix |
| MEW | Anthem BCBS of Maine |
| MEX | BCBS of New Mexico |
| MEY | Anthem BCBS of Maine |
| MEZ | BCBS of New Mexico |
| MFA | BCBS of Illinois |
| MFB | Wellmark BCBS |
| MFC | Carefirst BCBS of Maryland |
| MFD | Anthem BCBS of Georgia |
| MFE | Anthem Blue Cross of California |
| MFF | Regence BCBS of Oregon |
| MFG | Anthem BCBS of Ohio |
| MFH | Anthem BCBS of Georgia |
| MFI | Wellmark BCBS |
| MFJ | BCBS of Wisconsin |
| MFK | BCBS of Mississippi |
| MFL | Independence Blue Cross |
| MFM | Anthem BCBS of Georgia |
| MFN | Anthem BCBS of Virginia |
| MFO | Anthem BCBS of Wisconsin |
| MFP | Regence BCBS of Oregon |
| MFQ | Anthem BCBS of Virginia |
| MFR | Unassigned Prefix |
| MFS | Carefirst Administrators |
| MFT | Anthem Blue Cross of California |
| MFU | Wellmark BCBS |
| MFV | BCBS of Illinois |
| MFW | Anthem Blue Cross of California |
| MFX | BCBS of Michigan |
| MFY | BCBS of Minnesota |
| MGA | Independence Blue Cross |
| MGB | Capital Blue Cross |
| MGC | Unassigned Prefix |
| MGD | Premera Blue Cross |
| MGE | BCBS of Rhode Island |
| MGF | Anthem BCBS of Nevada |
| MGG | Independence Blue Cross |
| MGH | BCBS of Massachusetts |
| MGI | Highmark BCBS |
| MGJ | Anthem BCBS of Missouri |
| MGK | Wellmark BCBS |
| MGL | Independence Blue Cross |
| MGM | Carefirst BCBS of Maryland |
| MGN | Unassigned Prefix |
| MGO | BCBS of Michigan |
| MGP | Wellmark BCBS |
| MGQ | BCBS of Minnesota |
| MGR | BCBS of Michigan |
| MGS | BCBS of Georgia |
| MGT | Regence BCBS of Oregon |
| MGU | Anthem BCBS of Virginia |
| MGV | BCBS of South Carolina |
| MGW | BCBS of Arkansas |
| MGX | BCBS of Massachusetts |
| MGY | Blue Shield of California |
| MGZ | Horizon BCBS of New Jersey |
| MHA | BCBS of South Carolina |
| MHB | BCBS of Texas |
| MHC | Highmark BCBS |
| MHD | Empire BCBS of New York |
| MHE | Unassigned Prefix |
| MHF | Wellmark BCBS |
| MHG | Anthem Blue Cross of California |
| MHH | BCBS of Michigan |
| MHI | Anthem BCBS of Georgia |
| MHJ | Unassigned Prefix |
| MHK | Wellmark BCBS |
| MHL | BCBS of South Carolina |
| MHM | Carefirst BCBS of Maryland |
| MHN | Anthem BCBS of Ohio |
| MHO | Unassigned Prefix |
| MHP | Empire BCBS |
| MHQ | Anthem BCBS of Georgia |
| MHR | Unassigned Prefix |
| MHS | BCBS of Nebraska |
| MHT | Carefirst BCBS of Maryland |
| MHU | Unassigned Prefix |
| MHV | Unassigned Prefix |
| MHW | BCBS of Alabama |
| MHX | BCBS of Georgia |
| MHY | Anthem Blue Cross of California |
| MHZ | Wellmark BCBS |
| MIA | Blue Shield of California |
| MIB | BCBS of Minnesota |
| MIC | BCBS of South Carolina |
| MID | Unassigned Prefix |
| MIE | BCBS of Minnesota |
| MIF | Anthem BCBS of Ohio |
| MIG | BCBS of Michigan |
| MIH | BCBS of Georgia |
| MII | BCBS of Kansas City |
| MIJ | BCBS of Michigan |
| MIK | Unassigned Prefix |
| MIL | BCBS of Massachusetts |
| MIM | Highmark BCBS |
| MIN | Premera Blue Cross |
| MIO | Blue Shield of California |
| MIP | Blue Cross of Idaho |
| MIQ | Anthem BCBS of Ohio |
| MIR | Unassigned Prefix |
| MIS | Anthem BCBS of Ohio |
| MIT | Wellmark BCBS |
| MIU | BCBS of South Carolina |
| MIV | BCBS of Western New York |
| MIW | BCBS of Michigan |
| MIX | Blue Shield of California |
| MIY | Unassigned Prefix |
| MIZ | Blue Shield of California |
| MJA | Blue Shield of Northeastern New York |
| MJB | Anthem BCBS of Colorado |
| MJC | BCBS of Texas |
| MJD | BCBS of Alabama |
| MJE | BCBS of Michigan |
| MJF | Carefirst BCBS |
| MJG | Premera Blue Cross |
| MJH | Anthem BCBS of Wisconsin |
| MJI | Carefirst BCBS of Maryland |
| MJJ | BCBS of Michigan |
| MJK | Carefirst BCBS |
| MJL | Anthem Blue Cross of California |
| MJM | Highmark BCBS |
| MJN | Highmark BCBS |
| MJO | Anthem BCBS of Connecticut |
| MJP | Wellmark BCBS |
| MJQ | Anthem Blue Cross of California |
| MJR | BCBS of Michigan |
| MJS | BCBS of Texas |
| MJT | BCBS of Michigan |
| MJU | BCBS of Michigan |
| MJV | Anthem BCBS of Missouri |
| MJW | BCBS of Georgia |
| MJX | BCBS of Michigan |
| MJY | Unassigned Prefix |
| MJZ | Unassigned Prefix |
| MKA | Wellmark BCBS |
| MKB | Blue Shield of California |
| MKC | BCBS of South Carolina |
| MKD | BCBS of Massachusetts |
| MKE | BCBS of Tennessee |
| MKF | Premera Blue Cross |
| MKG | Anthem BCBS of Ohio |
| MKH | BCBS of Tennessee |
| MKI | BCBS of Tennessee |
| MKJ | Anthem BCBS of Ohio |
| MKK | Anthem Blue Cross of California |
| MKL | BCBS of Mississippi |
| MKM | Carefirst BCBS of Maryland |
| MKN | Anthem BCBS of Virginia |
| MKO | BCBS of Michigan |
| MKP | Anthem BCBS of Virginia |
| MKQ | Anthem Blue Cross of California |
| MKR | BCBS of Illinois |
| MKS | BCBS of Massachusetts |
| MKT | Wellmark BCBS |
| MKU | Premera Blue Cross |
| MKV | Horizon BCBS of New Jersey |
| MKW | BCBS of Florida |
| MKX | Anthem BCBS of Virginia |
| MKY | Horizon BCBS of New Jersey |
| MKZ | Carefirst BCBS of Maryland |
| MLA | Wellmark BCBS |
| MLB | Unassigned Prefix |
| MLC | BCBS of Illinois |
| MLD | Unassigned Prefix |
| MLE | BCBS of Illinois |
| MLF | Carefirst BCBS |
| MLG | Highmark BCBS |
| MLH | Carefirst BCBS of Maryland |
| MLI | Independence Blue Cross |
| MLJ | Carefirst BCBS of Maryland |
| MLK | Anthem BCBS of Virginia |
| MLL | Blue Shield of California |
| MLM | Highmark BCBS |
| MLN | Blue Shield of California |
| MLO | BCBS of Western New York |
| MLP | Anthem BCBS of Virginia |
| MLQ | BCBS of Minnesota |
| MLR | BCBS of Massachusetts |
| MLS | BCBS of Alabama |
| MLT | BCBS of Nebraska |
| MLU | BCBS of Minnesota |
| MLV | BCBS of Minnesota |
| MLW | BCBS of Georgia |
| MLX | Carefirst BCBS of Maryland |
| MLY | Premera Blue Cross |
| MLZ | BCBS of Rhode Island |
| MMA | Empire BCBS |
| MMB | Carefirst BCBS of Maryland |
| MMC | Unassigned Prefix |
| MMD | Premera Blue Cross |
| MME | Carefirst BCBS |
| MMF | Excellus BCBS of New York |
| MMG | BCBS of Mississippi |
| MMH | Empire BCBS |
| MMI | Independence Blue Cross |
| MMJ | BCBS of Michigan |
| MMK | BCBS of Illinois |
| MML | BCBS of Illinois |
| MMM | BCBS of Minnesota |
| MMN | BCBS of Tennessee |
| MMO | BCBS of Michigan |
| MMP | BCBS of North Carolina |
| MMQ | Anthem BCBS of Ohio |
| MMR | BCBS of Massachusetts |
| MMS | Anthem BCBS of Ohio |
| MMT | Carefirst Administrators |
| MMU | BCBS of Illinois |
| MMV | Anthem BCBS of Ohio |
| MMW | BCBS of Illinois |
| MMX | BCBS of Alabama |
| MMY | Unassigned Prefix |
| MMZ | Wellmark BCBS |
| MNA | BCBS of Minnesota |
| MNB | BCBS of Massachusetts |
| MNC | Anthem Blue Cross of California |
| MND | Anthem BCBS of Wisconsin |
| MNE | Anthem BCBS of Wisconsin |
| MNF | Independence Blue Cross |
| MNG | BCBS of Tennessee |
| MNH | Anthem BCBS of Virginia |
| MNI | BCBS of Georgia |
| MNJ | Anthem BCBS of Ohio |
| MNK | BCBS of Michigan |
| MNL | BCBS of South Carolina |
| MNM | BCBS of Minnesota |
| MNN | Highmark BCBS |
| MNO | BCBS of North Carolina |
| MNP | Blue Shield of California |
| MNQ | BCBS of Minnesota |
| MNR | BCBS of Minnesota |
| MNS | Anthem BCBS of Kentucky |
| MNT | BCBS of Illinois |
| MNU | BCBS of North Carolina |
| MNV | Unassigned Prefix |
| MNW | Premera Blue Cross |
| MNX | BCBS of Illinois |
| MNY | Premera Blue Cross |
| MNZ | Wellmark BCBS |
| MOA | BCBS of Massachusetts |
| MOB | Unassigned Prefix |
| MOC | BCBS of Georgia |
| MOD | BCBS of Massachusetts |
| MOE | BCBS of Illinois |
| MOF | Blue Shield of California |
| MOG | BCBS of South Carolina |
| MOH | Unassigned Prefix |
| MOI | BCBS of Massachusetts |
| MOJ | Anthem BCBS of Ohio |
| MOK | Independence Blue Cross |
| MOL | Unassigned Prefix |
| MOM | Anthem Blue Cross of California |
| MON | Unassigned Prefix |
| MOO | Unassigned Prefix |
| MOP | Unassigned Prefix |
| MOQ | Independence Blue Cross |
| MOR | Premera Blue Cross |
| MOS | Blue Shield of California |
| MOT | BCBS of Massachusetts |
| MOU | BCBS of Michigan |
| MOV | BCBS of Arkansas |
| MOW | Anthem BCBS of Kentucky |
| MOX | BCBS of Illinois |
| MOY | Wellmark BCBS |
| MOZ | Unassigned Prefix |
| MPA | BCBS of Mississippi |
| MPB | Unassigned Prefix |
| MPC | BCBS of Rhose Island |
| MPD | BCBS of Texas |
| MPE | BCBS of Michigan |
| MPF | Excellus BCBS of New York |
| MPG | Independence Blue Cross |
| MPH | BCBS of Massachusetts |
| MPI | Anthem Blue Cross of California |
| MPJ | Unassigned Prefix |
| MPK | Unassigned Prefix |
| MPL | BCBS of Illinois |
| MPM | Highmark BCBS |
| MPN | Wellmark BCBS |
| MPO | BCBS of Alabama |
| MPP | Anthem BCBS of Wisconsin |
| MPQ | BCBS of Minnesota |
| MPR | Anthem Blue Cross of California |
| MPS | BCBS of Georgia |
| MPT | BCBS of Minnesota |
| MPU | Anthem BCBS of Ohio |
| MPV | BCBS of Minnesota |
| MPW | BCBS of Nebraska |
| MPX | BCBS of Minnesota |
| MPY | BCBS of Florida |
| MPZ | Unassigned Prefix |
| MQA | BCBS of Michigan |
| MQB | Empire BCBS |
| MQC | Anthem Blue Cross of California |
| MQD | Carefirst Administrators |
| MQE | Anthem BCBS of Georgia |
| MQF | BCBS of Western New York |
| MQG | Carefirst BCBS |
| MQH | BCBS of Michigan |
| MQI | Wellmark BCBS |
| MQJ | BCBS of Michigan |
| MQK | BCBS of Michigan |
| MQL | Anthem BCBS of Georgia |
| MQM | Unassigned Prefix |
| MQN | BCBS of North Carolina |
| MQO | BCBS of Michigan |
| MQP | Anthem Blue Cross of California |
| MQQ | Blue Cross of Idaho |
| MQR | Highmark BCBS |
| MQS | Unassigned Prefix |
| MQT | BCBS of Minnesota |
| MQU | Anthem BCBS of Ohio |
| MQV | BCBS of Nebraska |
| MQW | BCBS of Michigan |
| MQX | Anthem Blue Cross of California |
| MQY | BCBS of North Carolina |
| MQZ | Anthem Blue Cross of California |
| MRA | Anthem BCBS of Virginia |
| MRB | Unassigned Prefix |
| MRC | BCBS of Illinois |
| MRD | Unassigned Prefix |
| MRE | Wellmark BCBS |
| MRF | BCBS of Michigan |
| MRG | BCBS of Illinois |
| MRH | Anthem BCBS of Wisconsin |
| MRI | Blue Shield of California |
| MRJ | Carefirst BCBS of Maryland |
| MRK | BCBS of Massachusetts |
| MRL | Wellmark BCBS |
| MRM | BCBS of Kansas City |
| MRN | Anthem BCBS of Wisconsin |
| MRO | Unassigned Prefix |
| MRP | Anthem BCBS of Wisconsin |
| MRQ | BCBS of Western New York |
| MRR | Anthem Blue Cross of California |
| MRS | Wellmark BCBS |
| MRT | BCBS of Texas |
| MRU | Highmark BCBS |
| MRV | Anthem Blue Cross of California |
| MRW | BCBS of Illinois |
| MRX | Anthem BCBS of Wisconsin |
| MRY | BCBS of Alabama |
| MRZ | BCBS of Illinois |
| MSA | BCBS of Alabama |
| MSB | Wellmark BCBS |
| MSC | BCBS of Alabama |
| MSD | Independence Blue Cross |
| MSE | BCBS of Michigan |
| MSF | Empire BCBS of New York |
| MSG | BCBS of Michigan |
| MSH | BCBS of Michigan |
| MSI | Regence BCBS of Oregon |
| MSJ | Premera Blue Cross |
| MSK | BCBS of Massachusetts |
| MSL | Carefirst Administrators |
| MSM | Carefirst BCBS of Maryland |
| MSN | Anthem BCBS of Ohio |
| MSO | BCBS of Nebraska |
| MSP | Premera Blue Cross |
| MSQ | Premera Blue Cross |
| MSR | BCBS of Michigan |
| MSS | Highmark BCBS |
| MST | Premera Blue Cross |
| MSU | Anthem BCBS of Ohio |
| MSV | BCBS of Alabama |
| MSW | BCBS of Illinois |
| MSX | Anthem Blue Cross of California |
| MSY | Premera Blue Cross |
| MSZ | Anthem Blue Cross of California |
| MTA | Anthem BCBS of Virginia |
| MTB | Wellmark BCBS |
| MTC | Anthem BCBS of Virginia |
| MTD | Premera Blue Cross |
| MTE | Blue Shield of California |
| MTF | Anthem BCBS of Georgia |
| MTG | Carefirst BCBS of Maryland |
| MTH | Wellmark BCBS |
| MTI | Empire BCBS of New York |
| MTJ | Blue Cross of Idaho |
| MTK | Wellmark BCBS |
| MTL | BCBS of Texas |
| MTM | BCBS of South Carolina |
| MTN | BCBS of Massachusetts |
| MTO | Blue Shield of California |
| MTP | BCBS of Massachusetts |
| MTQ | Blue Shield of California |
| MTR | BCBS of Tennessee |
| MTS | Carefirst BCBS of Maryland |
| MTT | Blue Shield of California |
| MTU | Premera Blue Cross |
| MTV | Anthem BCBS of Indiana |
| MTW | Anthem BCBS of Ohio |
| MTX | Carefirst Administrators |
| MTY | Anthem Blue Cross of California |
| MTZ | BCBS of Illinois |
| MUA | BCBS of Texas |
| MUB | Carefirst BCBS of Maryland |
| MUC | Wellmark BCBS |
| MUD | Carefirst BCBS of Maryland |
| MUE | Wellmark BCBS |
| MUF | Anthem BCBS of Wisconsin |
| MUG | BCBS of Arkansas |
| MUH | Carefirst BCBS of Maryland |
| MUI | Unassigned Prefix |
| MUJ | BCBS of Georgia |
| MUK | Anthem BCBS of Wisconsin |
| MUL | BCBS of Illinois |
| MUM | BCBS of Arizona |
| MUN | BCBS of Illinois |
| MUO | Anthem BCBS of Wisconsin |
| MUP | BCBS of Minnesota |
| MUQ | Premera Blue Cross |
| MUR | BCBS of Michigan |
| MUS | BCBS of Texas |
| MUT | BCBS of Minnesota |
| MUU | BCBS of Michigan |
| MUV | Carefirst BCBS |
| MUW | Highmark BCBS |
| MUX | Wellmark BCBS |
| MUY | BCBS of Alabama |
| MUZ | BCBS of Michigan |
| MVA | BCBS of Montana |
| MVB | BCBS of Vermont |
| MVC | BCBS of South Carolina |
| MVD | Premera Blue Cross |
| MVE | BCBS of Massachusetts |
| MVF | Empire BCBS of New York |
| MVG | BCBS of Minnesota |
| MVH | Unassigned Prefix |
| MVI | BCBS of Michigan |
| MVJ | Blue Shield of California |
| MVK | BCBS of Georgia |
| MVL | BCBS of Massachusetts |
| MVM | BCBS of Alabama |
| MVN | Empire BCBS of New York |
| MVO | Blue Shield of California |
| MVP | Carefirst BCBS |
| MVQ | Blue Cross of Idaho |
| MVR | Highmark BCBS |
| MVS | Blue Shield of California |
| MVT | BCBS of Minnesota |
| MVU | Anthem BCBS of Ohio |
| MVV | Wellmark BCBS |
| MVW | Unassigned Prefix |
| MVX | BCBS of South Carolina |
| MVY | Anthem BCBS of Ohio |
| MVZ | Highmark BCBS |
| MWA | BCBS of Illinois |
| MWB | Unassigned Prefix |
| MWC | Unassigned Prefix |
| MWD | Carefirst Administrators |
| MWE | Anthem BCBS of Wisconsin |
| MWF | BCBS of Illinois |
| MWG | BCBS of Minnesota |
| MWH | BCBS of Illinois |
| MWI | Unassigned Prefix |
| MWJ | Horizon BCBS of New Jersey |
| MWK | Horizon BCBS of New Jersey |
| MWL | BCBS of Illinois |
| MWM | BCBS of Georgia |
| MWN | BCBS of Illinois |
| MWO | Independence Blue Cross |
| MWP | BCBS of Massachusetts |
| MWQ | Anthem BCBS of Virginia |
| MWR | BCBS of Kansas City |
| MWS | Anthem BCBS of Virginia |
| MWT | Blue Shield of California |
| MWU | Anthem BCBS of Wisconsin |
| MWV | Anthem BCBS of Wisconsin |
| MWW | Anthem BCBS of Nevada |
| MWX | BCBS of Alabama |
| MWY | Unassigned Prefix |
| MWZ | Independence Blue Cross |
| MXA | Anthem Blue Cross of California |
| MXB | Highmark BCBS |
| MXC | Unassigned Prefix |
| MXD | BCBS of Texas |
| MXE | BCBS of Texas |
| MXF | Empire BCBS of New York |
| MXG | BCBS of Massachusetts |
| MXH | Carefirst BCBS of Maryland |
| MXI | Blue Shield of California |
| MXJ | Anthem BCBS of Virginia |
| MXK | Capital Blue Cross |
| MXL | Wellmark BCBS |
| MXM | Wellmark BCBS |
| MXN | BCBS of Massachusetts |
| MXO | Wellmark BCBS |
| MXP | BCBS of Massachusetts |
| MXQ | Empire BCBS |
| MXR | Anthem Blue Cross of California |
| MXS | Anthem BCBS of Georgia |
| MXT | Unassigned Prefix |
| MXU | Anthem BCBS of Connecticut |
| MXV | Blue Cross of Idaho |
| MXW | Blue Cross of Idaho |
| MXX | BCBS of Minnesota |
| MXY | BCBS of Massachusetts |
| MXZ | Premera Blue Cross |
| MYA | Unassigned Prefix |
| MYB | Regence BCBS of Oregon |
| MYC | Unassigned Prefix |
| MYD | BCBS of Massachusetts |
| MYE | Anthem BCBS of Ohio |
| MYF | Empire BCBS of New York |
| MYG | Wellmark BCBS |
| MYH | BCBS of Massachusetts |
| MYI | BCBS of Massachusetts |
| MYJ | Unassigned Prefix |
| MYK | BCBS of Massachusetts |
| MYL | BCBS of Massachusetts |
| MYM | Anthem BCBS of Ohio |
| MYN | Anthem BCBS of Ohio |
| MYO | Unassigned Prefix |
| MYP | BCBS of Georgia |
| MYQ | BCBS of Massachusetts |
| MYR | BCBS of Alabama |
| MYS | BCBS of Massachusetts |
| MYT | BCBS of Michigan |
| MYU | BCBS of Massachusetts |
| MYV | Regence Blue Cross Blue Shield of Utah |
| MYW | Carefirst BCBS of Maryland |
| MYX | BCBS of Oklahoma |
| MYY | Carefirst BCBS of Maryland |
| MYZ | BCBS of Massachusetts |
| MZA | Wellmark BCBS |
| MZB | Highmark BCBS |
| MZC | BCBS of Rhose Island |
| MZD | BCBS of Illinois |
| MZE | BCBS of Massachusetts |
| MZF | BCBS of Illinois |
| MZG | BCBS of Illinois |
| MZH | Unassigned Prefix |
| MZI | Blue Shield of California |
| MZJ | BCBS of Massachusetts |
| MZK | Anthem BCBS of Virginia |
| MZL | BCBS of Alabama |
| MZM | BCBS of Minnesota |
| MZN | BCBS of North Carolina |
| MZO | BCBS of Michigan |
| MZP | BCBS of Michigan |
| MZQ | BCBS of Minnesota |
| MZR | BCBS of Minnesota |
| MZS | BCBS of North Carolina |
| MZT | BCBS of Minnesota |
| MZU | BCBS of South Carolina |
| MZV | BCBS of Michigan |
| MZW | BCBS of Minnesota |
| MZX | BCBS of Minnesota |
| MZY | BCBS of Michigan |
| MZZ | BCBS of Minnesota |