Prefixes from IAA to JZK
| IAA | ANTHEM BLUE CROSS – CALIFORNIA |
| IAB | WELLMARK OF IOWA/SOUTH DAKOTA |
| IAD | ANTHEM BCBS – OHIO |
| IAF | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IAG | WELLPOINT HEALTH NETWORKS-VIRGINIA |
| IAI | BCBS – SOUTH CAROLINA |
| IAJ | BLUE SHIELD OF CALIFORNIA |
| IAK | BCBS OF MICHIGAN |
| IAL | WELLMARK OF IOWA/SOUTH DAKOTA |
| IAR | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IAS | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IAT | EMPIRE BCBS – NEW YORK |
| IAX | WELLMARK OF IOWA/SOUTH DAKOTA |
| IAY | BCBS – SOUTH CAROLINA |
| IAZ | BCBS OF MICHIGAN |
| IBA | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IBE | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IBG | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IBH | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IBI | WELLMARK OF IOWA/SOUTH DAKOTA |
| IBJ | BCBS OF MICHIGAN |
| IBN | BCBS OF MICHIGAN |
| IBU | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IBV | BCBS – SOUTH CAROLINA |
| IBY | ANTHEM BCBS – OHIO |
| ICB | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| ICD | CAREFIRST BCBS – MARYLAND |
| ICH | EMPIRE BCBS – NEW YORK |
| ICI | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| ICJ | CAREFIRST BCBS – WASHINGTON DC |
| ICM | ANTHEM BCBS – OHIO |
| ICN | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| ICO | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| ICQ | ANTHEM BCBS – VIRGINIA |
| ICR | ANTHEM BCBS – OHIO |
| ICS | BCBS OF MICHIGAN |
| ICV | BCBS OF MICHIGAN |
| ICW | ANTHEM BCBS – MISSOURI |
| ICY | ANTHEM BCBS – OHIO |
| IDA | BLUE CROSS – IDAHO – BOISE |
| IDB | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IDK | ANTHEM BLUE CROSS – CALIFORNIA |
| IDL | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IDN | BLUE SHIELD OF CALIFORNIA |
| IDO | ANTHEM BLUE CROSS – CALIFORNIA |
| IDP | BLUE CROSS – IDAHO – BOISE |
| IDR | ANTHEM BLUE CROSS – CALIFORNIA |
| IDS | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IDT | ANTHEM BLUE CROSS – CALIFORNIA |
| IDU | ANTHEM BCBS – OHIO |
| IDW | ANTHEM BCBS – OHIO |
| IDX | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IDY | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IEF | HIGHMARK INC |
| IEL | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IEM | EMPIRE BCBS – NEW YORK |
| IEP | BCBS – LOUISIANA |
| IEQ | ANTHEM BCBS – OHIO |
| IES | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| IET | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IEU | BCBS – LOUISIANA |
| IEV | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IEW | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IEX | BLUE SHIELD OF CALIFORNIA |
| IFA | ANTHEM BLUE CROSS – CALIFORNIA |
| IFB | WELLMARK OF IOWA/SOUTH DAKOTA |
| IFF | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IFG | ANTHEM BCBS – OHIO |
| IFH | WELLMARK OF IOWA/SOUTH DAKOTA |
| IFI | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IFL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IFR | ANTHEM BCBS – OHIO |
| IFS | BCBS – KANSAS CITY – MO |
| IFW | ANTHEM BLUE CROSS – CALIFORNIA |
| IFX | ANTHEM BLUE CROSS – CALIFORNIA |
| IGB | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IGD | WELLMARK OF IOWA/SOUTH DAKOTA |
| IGH | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| IGI | WELLMARK OF IOWA/SOUTH DAKOTA |
| IGK | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IGL | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IGP | WELLMARK OF IOWA/SOUTH DAKOTA |
| IGS | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IGT | BLUE SHIELD OF CALIFORNIA |
| IHE | ANTHEM BCBS – OHIO |
| IHH | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IHK | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| IHL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IHP | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IHQ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IHR | BLUE CROSS – IDAHO – BOISE |
| IHT | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IHW | BLUE SHIELD OF CALIFORNIA |
| IHX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| III | BLUECROSS BLUESHIELD OF TENNESSEE |
| IIS | BCBS OF MICHIGAN |
| IIT | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| IJA | ANTHEM BCBS – OHIO |
| IJM | ANTHEM BLUE CROSS – CALIFORNIA |
| IJP | ANTHEM BCBS – OHIO |
| IJS | ANTHEM BCBS – OHIO |
| IJU | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| IKC | ANTHEM BCBS – OHIO |
| ILD | BCBS OF MICHIGAN |
| ILF | ANTHEM BCBS – OHIO |
| ILH | ANTHEM BLUE CROSS – CALIFORNIA |
| ILL | ANTHEM BLUE CROSS – CALIFORNIA |
| ILM | ANTHEM BLUE CROSS – CALIFORNIA |
| ILS | PREMERA BLUE CROSS – SEATTLE WA |
| ILT | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| ILU | ANTHEM BLUE CROSS – CALIFORNIA |
| ILY | ANTHEM BLUE CROSS – CALIFORNIA |
| IMB | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IME | ANTHEM BLUE CROSS – CALIFORNIA |
| IMI | WELLMARK OF IOWA/SOUTH DAKOTA |
| IMO | ANTHEM BLUE CROSS – CALIFORNIA |
| IMP | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IMU | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IMV | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IMW | ANTHEM BCBS – COLORADO |
| IMY | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IMZ | BCBS OF MICHIGAN |
| INA | EMPIRE BCBS – NEW YORK |
| INC | ANTHEM BLUE CROSS – CALIFORNIA |
| IND | WELLPOINT HEALTH NETWORKS-VIRGINIA |
| INE | BCBS – SOUTH CAROLINA |
| INF | BLUE SHIELD OF CALIFORNIA |
| ING | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| INH | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| INM | BCBS – NORTH CAROLINA |
| INO | BLUE SHIELD OF CALIFORNIA |
| INT | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| INU | BCBS – SOUTH CAROLINA |
| INW | INDEPENDENCE BLUE CROSS |
| INX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| INZ | REGENCE BCBS – OREGON |
| IOB | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IOD | ANTHEM BLUE CROSS – CALIFORNIA |
| IOE | EMPIRE BCBS – NEW YORK |
| ION | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| IOP | BLUE CROSS AND BLUE SHIELD-OKLAHOMA |
| IOT | HIGHMARK INC |
| IPA | HIGHMARK INC |
| IPB | EMPIRE BCBS – NEW YORK |
| IPD | WELLMARK OF IOWA/SOUTH DAKOTA |
| IPE | BLUE SHIELD OF CALIFORNIA |
| IPH | BCBS – KANSAS – TOPEKA |
| IPM | HIGHMARK INC |
| IPN | HIGHMARK INC |
| IPP | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IPS | BLUE SHIELD OF CALIFORNIA |
| IPV | BCBS OF MICHIGAN |
| IQA | PREMERA BLUE CROSS – SEATTLE WA |
| IQT | ANTHEM BCBS – OHIO |
| IRG | ANTHEM BCBS – OHIO |
| IRP | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| IRS | BLUE CROSS AND BLUE SHIELD-FLORIDA |
| IRT | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IRU | ANTHEM BCBS – OHIO |
| IRX | BCBS – SOUTH CAROLINA |
| IRZ | ANTHEM BLUE CROSS – CALIFORNIA |
| ISA | ANTHEM BCBS – OHIO |
| ISD | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| ISE | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| ISF | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| ISG | ANTHEM BCBS – OHIO |
| ISJ | BLUECROSS BLUESHIELD OF TENNESSEE |
| ISL | HEALTHNOW NEW YORK INC – BUFFALO |
| ISM | HIGHMARK INC |
| ISQ | ANTHEM BCBS – OHIO |
| IST | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| ISX | WELLMARK OF IOWA/SOUTH DAKOTA |
| ISY | ANTHEM BCBS – MISSOURI |
| ITA | CAREFIRST BCBS – WASHINGTON DC |
| ITE | BCBS – NORTH CAROLINA |
| ITG | ANTHEM BCBS – VIRGINIA |
| ITQ | WELLMARK OF IOWA/SOUTH DAKOTA |
| ITR | EMPIRE BCBS – NEW YORK |
| ITS | BLUE ADVANTAGE ADMINS OF ARKANSAS |
| ITU | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| ITV | HEALTHCARE ADMINISTRATORS – SEATTLE |
| ITW | BLUE CROSS AND BLUE SHIELD-ILLINOIS |
| ITY | HEALTHCARE ADMINISTRATORS – SEATTLE |
| IUB | ANTHEM BCBS – OHIO |
| IUF | ANTHEM BCBS – OHIO |
| IUG | PREMERA BLUE CROSS – SEATTLE WA |
| IUK | BCBS – SOUTH CAROLINA |
| IUM | ANTHEM BCBS – OHIO |
| IUO | ANTHEM BCBS – OHIO |
| IUP | ANTHEM BCBS – OHIO |
| IUW | ANTHEM BCBS – OHIO |
| IVK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IVL | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IVR | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IVS | ANTHEM BLUE CROSS – CALIFORNIA |
| IVW | ANTHEM BCBS – OHIO |
| IVY | EMPIRE BCBS – NEW YORK |
| IVZ | ANTHEM BCBS – OHIO |
| IWB | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IWM | HEALTHNOW NEW YORK INC – ALBANY |
| IWN | ANTHEM BCBS – OHIO |
| IWP | BCBS OF MICHIGAN |
| IWS | WELLMARK OF IOWA/SOUTH DAKOTA |
| IWU | ANTHEM BCBS – OHIO |
| IWW | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| IWZ | BCBS OF MICHIGAN |
| IXB | BCBS – SOUTH CAROLINA |
| IXC | ANTHEM BCBS – VIRGINIA |
| IXI | HIGHMARK INC |
| IXR | HIGHMARK INC |
| IXT | ANTHEM BLUE CROSS – CALIFORNIA |
| IXW | BCBS OF MICHIGAN |
| IYC | INDEPENDENCE BLUE CROSS |
| IYF | ANTHEM BCBS – OHIO |
| IYS | BLUE CROSS AND BLUE SHIELD-GEORGIA |
| IZA | BLUE CROSS AND BLUE SHIELD-ALABAMA |
| IZC | ANTHEM BCBS – OHIO |
| IZP | BLUE CROSS – IDAHO – BOISE |
| IZS | BCBS OF MICHIGAN |
| IZU | WELLMARK OF IOWA/SOUTH DAKOTA |
| J01 | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JAE | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JCG | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JCK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JET | BLUE CROSS AND BLUE SHIELD OF TEXAS |
| JFK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHG | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHI | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHM | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHN | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHQ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JHZ | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JJA | HEALTHCARE ADMINISTRATORS – SEATTLE |
| JJC | HEALTHCARE ADMINISTRATORS – SEATTLE |
| JKA | WELLPOINT HEALTH NETWORKS-KENTUCKY |
| JKG | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JKK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JNX | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JPC | EMPIRE BCBS – NEW YORK |
| JQA | ANTHEM BLUE CROSS – CALIFORNIA |
| JQB | ANTHEM BLUE CROSS – CALIFORNIA |
| JQC | ANTHEM BLUE CROSS – CALIFORNIA |
| JQD | ANTHEM BLUE CROSS – CALIFORNIA |
| JQK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
| JQQ | ANTHEM BLUE CROSS – CALIFORNIA |
| JQV | ANTHEM BLUE CROSS – CALIFORNIA |
| JWA | ANTHEM BCBS – MISSOURI |
| JWB | ANTHEM BCBS – MISSOURI |
| JWC | ANTHEM BCBS – MISSOURI |
| JWD | ANTHEM BCBS – MISSOURI |
| JWE | ANTHEM BCBS – MISSOURI |
| JWG | ANTHEM BCBS – MISSOURI |
| JWI | WELLPOINT HEALTH NETWORKS-MISSOURI |
| JWM | ANTHEM BCBS – MISSOURI |
| JWP | ANTHEM BCBS – MISSOURI |
| JWW | ANTHEM BCBS – MISSOURI |
| JZK | BLUE CROSS BLUE SHIELD OF MICHIGAN |
