Prefixes from MAB to MZY
| MAB | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| MAG | NEW MEXICO BCBS |
| MAH | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MAI | WELLMARK OF IOWA/SOUTH DAKOTA |
| MAK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MAQ | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| MAR | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MAS | BCBS OF MICHIGAN |
| MAU | WELLMARK OF IOWA/SOUTH DAKOTA |
| MAV | ANTHEM BCBS – OHIO |
| MAW | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MAX | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MBB | ANTHEM BCBS – VIRGINIA |
| MBG | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MBK | EMPIRE BCBS – NEW YORK |
| MBL | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MBM | HIGHMARK INC |
| MBO | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| MBT | ANTHEM BCBS – MISSOURI |
| MBU | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MBV | CAREFIRST BCBS – MARYLAND |
| MBY | BLUE SHIELD OF CALIFORNIA |
| MCD | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MCG | CAREFIRST BCBS – WASHINGTON DC |
| MCH | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| MCN | EMPIRE BCBS – NEW YORK |
| MCQ | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MCW | WELLMARK OF IOWA/SOUTH DAKOTA |
| MCX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MCZ | ANTHEM BCBS – OHIO |
| MDB | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MDE | ANTHEM BLUE CROSS – CALIFORNIA |
| MDG | BCBS OF MICHIGAN |
| MDH | CAREFIRST BCBS – MARYLAND |
| MDL | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MDM | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MDN | CAREFIRST BCBS – WASHINGTON DC |
| MDP | EMPIRE BCBS – NEW YORK |
| MDQ | BCBS – MINNESOTA |
| MDR | BLUE SHIELD OF CALIFORNIA |
| MDS | CAREFIRST BCBS – MARYLAND |
| MDW | WELLMARK OF IOWA/SOUTH DAKOTA |
| MDX | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MDZ | BCBS – MINNESOTA |
| MEB | ANTHEM BCBS – VIRGINIA |
| MED | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MEG | ANTHEM BLUE CROSS – CALIFORNIA |
| MEI | BCBS OF MICHIGAN |
| MEJ | CAREFIRST BCBS – MARYLAND |
| MEL | WELLMARK OF IOWA/SOUTH DAKOTA |
| MEM | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MEN | ANTHEM BCBS – CONNECTICUT |
| MEO | BLUE SHIELD OF CALIFORNIA |
| MEU | ANTHEM BCBS – VIRGINIA |
| MEW | BCBS OF MICHIGAN |
| MEX | NEW MEXICO BCBS |
| MEY | EMPIRE BCBS – NEW YORK |
| MFA | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MFC | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MFF | ANTHEM BCBS – OHIO |
| MFI | WELLMARK OF IOWA/SOUTH DAKOTA |
| MFJ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MFK | BCBS – MISSISSIPPI |
| MFL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MFM | BCBS – NORTH CAROLINA |
| MFO | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MFQ | ANTHEM BCBS – OHIO |
| MFT | ANTHEM BLUE CROSS – CALIFORNIA |
| MFU | WELLMARK OF IOWA/SOUTH DAKOTA |
| MGA | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MGC | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MGD | PREMERA BLUE CROSS – SEATTLE WA |
| MGH | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MGK | WELLMARK OF IOWA/SOUTH DAKOTA |
| MGL | INDEPENDENCE BLUE CROSS |
| MGM | CAREFIRST BCBS – WASHINGTON DC |
| MGP | WELLMARK OF IOWA/SOUTH DAKOTA |
| MGR | BCBS OF MICHIGAN |
| MGT | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MGV | BCBS – SOUTH CAROLINA |
| MGW | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MGY | BLUE SHIELD OF CALIFORNIA |
| MHA | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MHD | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MHE | ANTHEM BCBS – OHIO |
| MHF | HIGHMARK INC |
| MHH | BCBS OF MICHIGAN |
| MHI | WELLMARK OF IOWA/SOUTH DAKOTA |
| MHJ | ANTHEM BCBS – MISSOURI |
| MHO | BCBS – RHODE ISLAND |
| MHP | ANTHEM BCBS – MISSOURI |
| MHQ | ANTHEM BCBS – OHIO |
| MHR | BCBS – KANSAS CITY – MO |
| MHT | CAREFIRST BCBS – MARYLAND |
| MHU | ANTHEM BCBS – MISSOURI |
| MHW | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MHY | ANTHEM BLUE CROSS – CALIFORNIA |
| MIA | ANTHEM BCBS – VIRGINIA |
| MIB | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MIE | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MIG | BCBS OF MICHIGAN |
| MIH | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MIJ | BCBS OF MICHIGAN |
| MIM | HIGHMARK INC |
| MIO | BLUE SHIELD OF CALIFORNIA |
| MIT | WELLMARK OF IOWA/SOUTH DAKOTA |
| MIV | HEALTHNOW NEW YORK INC – BUFFALO |
| MIW | BCBS OF MICHIGAN |
| MIW | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MIY | ANTHEM BCBS – MISSOURI |
| MJC | ANTHEM BLUE CROSS – CALIFORNIA |
| MJD | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MJE | BCBS OF MICHIGAN |
| MJG | PREMERA BLUE CROSS – SEATTLE WA |
| MJI | CAREFIRST BCBS – MARYLAND |
| MJJ | BCBS OF MICHIGAN |
| MJK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MJL | ANTHEM BLUE CROSS – CALIFORNIA |
| MJM | HIGHMARK INC |
| MJN | HIGHMARK INC |
| MJP | WELLMARK OF IOWA/SOUTH DAKOTA |
| MJQ | ANTHEM BCBS – OHIO |
| MJS | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MJU | BCBS OF MICHIGAN |
| MJV | EMPIRE BCBS – NEW YORK |
| MJW | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MJX | BCBS OF MICHIGAN |
| MJZ | ANTHEM BCBS – OHIO |
| MKA | WELLMARK OF IOWA/SOUTH DAKOTA |
| MKC | BCBS – SOUTH CAROLINA |
| MKD | BCBS – SOUTH CAROLINA |
| MKE | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MKI | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MKJ | ANTHEM BCBS – OHIO |
| MKK | ANTHEM BLUE CROSS – CALIFORNIA |
| MKQ | ANTHEM BLUE CROSS – CALIFORNIA |
| MKR | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MKS | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MKU | PREMERA BLUE CROSS – SEATTLE WA |
| MLA | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MLC | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MLF | ANTHEM BCBS – OHIO |
| MLH | BCBS – SOUTH CAROLINA |
| MLJ | CAREFIRST BCBS – MARYLAND |
| MLK | ANTHEM BCBS – VIRGINIA |
| MLM | HIGHMARK INC |
| MLN | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MLO | HEALTHNOW NEW YORK INC – BUFFALO |
| MLR | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MLS | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MLZ | ANTHEM BCBS – OHIO |
| MMA | BCBS – MINNESOTA |
| MME | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MMF | EXCELLUS BCBS – ROCHESTER – NY |
| MMG | BCBS – MISSISSIPPI |
| MMM | BCBS – MINNESOTA |
| MMP | BCBS – NORTH CAROLINA |
| MMQ | HEALTHNOW NEW YORK INC – BUFFALO |
| MMR | PREMERA BLUE CROSS – SEATTLE WA |
| MMS | ANTHEM BCBS – VIRGINIA |
| MMX | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MNJ | ANTHEM BLUE CROSS – CALIFORNIA |
| MNK | BCBS OF MICHIGAN |
| MNO | BCBS – NORTH CAROLINA |
| MNQ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MNT | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MNU | BCBS – NORTH CAROLINA |
| MNV | EMPIRE BCBS – NEW YORK |
| MNX | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MNY | BCBS – MINNESOTA |
| MOB | ANTHEM BLUE CROSS – CALIFORNIA |
| MOJ | ANTHEM BCBS – OHIO |
| MON | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MOO | ANTHEM BCBS – COLORADO |
| MOP | WELLMARK OF IOWA/SOUTH DAKOTA |
| MOQ | BLUE SHIELD OF CALIFORNIA |
| MOU | ANTHEM BCBS – MISSOURI |
| MOV | ANTHEM BLUE CROSS – CALIFORNIA |
| MOW | ANTHEM BCBS – OHIO |
| MOX | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MOZ | BCBS – SOUTH CAROLINA |
| MPB | WELLMARK OF IOWA/SOUTH DAKOTA |
| MPD | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MPF | EXCELLUS BCBS – ROCHESTER – NY |
| MPG | WELLMARK OF IOWA/SOUTH DAKOTA |
| MPH | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MPJ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MPK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MPM | HIGHMARK INC |
| MPO | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MPP | CAREFIRST BCBS – WASHINGTON DC |
| MPR | ANTHEM BLUE CROSS – CALIFORNIA |
| MPU | ANTHEM BCBS – OHIO |
| MPY | EMPIRE BCBS – NEW YORK |
| MPZ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MQA | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MQB | BCBS – MINNESOTA |
| MQC | ANTHEM BLUE CROSS – CALIFORNIA |
| MQE | BCBS OF MICHIGAN |
| MQE | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MQF | HEALTHNOW NEW YORK INC – BUFFALO |
| MQH | BCBS OF MICHIGAN |
| MQJ | BCBS OF MICHIGAN |
| MQK | BCBS OF MICHIGAN |
| MQN | BCBS – NORTH CAROLINA |
| MQO | BCBS OF MICHIGAN |
| MQP | ANTHEM BLUE CROSS – CALIFORNIA |
| MQR | HIGHMARK INC |
| MQW | BCBS OF MICHIGAN |
| MQY | BCBS – NORTH CAROLINA |
| MQZ | ANTHEM BLUE CROSS – CALIFORNIA |
| MRB | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MRD | ANTHEM BLUE CROSS – CALIFORNIA |
| MRE | PREMERA BLUE CROSS – SEATTLE WA |
| MRF | BCBS OF MICHIGAN |
| MRG | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MRI | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MRJ | CAREFIRST BCBS – MARYLAND |
| MRK | ANTHEM BCBS – VIRGINIA |
| MRL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MRQ | HEALTHNOW NEW YORK INC – BUFFALO |
| MRU | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MRV | ANTHEM BLUE CROSS – CALIFORNIA |
| MRW | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MRY | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MSA | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MSD | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MSI | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MSJ | PREMERA BLUE CROSS – SEATTLE WA |
| MSK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MSN | PREMERA BLUE CROSS – SEATTLE WA |
| MSQ | PREMERA BLUE CROSS – SEATTLE WA |
| MSR | BCBS OF MICHIGAN |
| MSV | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MSX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MTA | ANTHEM BCBS – OHIO |
| MTB | WELLMARK OF IOWA/SOUTH DAKOTA |
| MTF | CAPITAL BLUE CROSS – HARRISBURG PA |
| MTG | CAREFIRST BCBS – WASHINGTON DC |
| MTI | EMPIRE BCBS – NEW YORK |
| MTN | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MTO | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MTP | BCBS – MASSACHUSETTS |
| MTR | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MTY | ANTHEM BLUE CROSS – CALIFORNIA |
| MTZ | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MUA | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MUC | WELLMARK OF IOWA/SOUTH DAKOTA |
| MUE | WELLMARK OF IOWA/SOUTH DAKOTA |
| MUF | ANTHEM BCBS – OHIO |
| MUG | ANTHEM BCBS – OHIO |
| MUH | ANTHEM BCBS – MISSOURI |
| MUI | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MUK | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MUO | BCBS OF MICHIGAN |
| MUS | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MUU | BCBS OF MICHIGAN |
| MUW | HIGHMARK INC |
| MUX | WELLMARK OF IOWA/SOUTH DAKOTA |
| MUY | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MUZ | BCBS OF MICHIGAN |
| MVB | CAPITAL BLUE CROSS – HARRISBURG PA |
| MVC | ANTHEM BCBS – VIRGINIA |
| MVD | PREMERA BLUE CROSS – SEATTLE WA |
| MVF | EMPIRE BCBS – NEW YORK |
| MVH | ANTHEM BCBS – MISSOURI |
| MVJ | BLUE SHIELD OF CALIFORNIA |
| MVK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MVL | ANTHEM BLUE CROSS – CALIFORNIA |
| MVM | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MVO | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MVP | ANTHEM BCBS – VIRGINIA |
| MVQ | BCBS – NORTH CAROLINA |
| MVR | HIGHMARK INC |
| MVV | WELLMARK OF IOWA/SOUTH DAKOTA |
| MVX | BCBS – SOUTH CAROLINA |
| MWG | ANTHEM BCBS – OHIO |
| MWH | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MWM | ANTHEM BLUE CROSS – CALIFORNIA |
| MWO | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MWO | BLUECROSS BLUESHIELD-NORTH DAKOTA |
| MWP | ANTHEM BCBS – VIRGINIA |
| MWQ | WELLPOINT HEALTH NETWORKS-VIRGINIA |
| MWR | BCBS – KANSAS CITY – MO |
| MWS | WELLPOINT HEALTH NETWORKS-VIRGINIA |
| MWT | ANTHEM BCBS – OHIO |
| MWU | ANTHEM BCBS – OHIO |
| MWX | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MWX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MWY | ANTHEM BCBS – OHIO |
| MWZ | BLUE CROSS – IDAHO – BOISE |
| MXB | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MXE | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| MXF | EMPIRE BCBS – NEW YORK |
| MXG | ANTHEM BCBS – MISSOURI |
| MXH | CAREFIRST BCBS – MARYLAND |
| MXJ | WELLPOINT HEALTH NETWORKS-VIRGINIA |
| MXK | CAPITAL BLUE CROSS – HARRISBURG PA |
| MXL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MXO | WELLMARK OF IOWA/SOUTH DAKOTA |
| MXR | ANTHEM BLUE CROSS – CALIFORNIA |
| MXU | BLUE SHIELD OF CALIFORNIA |
| MXV | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MXX | BCBS – MINNESOTA |
| MYB | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| MYD | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MYE | ANTHEM BCBS – OHIO |
| MYF | EMPIRE BCBS – NEW YORK |
| MYJ | ANTHEM BCBS – MISSOURI |
| MYK | ANTHEM BCBS – MISSOURI |
| MYM | ANTHEM BCBS – OHIO |
| MYN | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MYO | ANTHEM BCBS – OHIO |
| MYR | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MYT | BCBS OF MICHIGAN |
| MYU | ANTHEM BCBS – OHIO |
| MYV | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MYW | CAREFIRST BCBS – MARYLAND |
| MYX | BLUE CROSS AND BLUE SHIELD-OKLAHOMA |
| MYY | CAREFIRST BCBS – MARYLAND |
| MZB | HIGHMARK INC |
| MZC | BCBS – RHODE ISLAND |
| MZD | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| MZF | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZH | ANTHEM BCBS – MISSOURI |
| MZI | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZJ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZL | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| MZN | BCBS – NORTH CAROLINA |
| MZO | BCBS OF MICHIGAN |
| MZP | BCBS OF MICHIGAN |
| MZQ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZR | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| MZU | BCBS – SOUTH CAROLINA |
| MZV | BCBS OF MICHIGAN |
| MZY | BCBS OF MICHIGAN |
