| AAA | BCBS of Alabama (AL) |
| AAB | BCBS Blue Care Network Michigan (MI) |
| AAC | BCBS of Illinois (IL) |
| AAD | BCBS of South Carolina (SC) / Southcarolinablues |
| AAE | Anthem BCBS of Nevada (NV) |
| AAF | BCBS of Arizona (AZ) |
| AAG | Anthem BCBS of Georgia (GA) |
| AAH | Blue shield(BS) of California (CA) |
| AAI | BCBS Blue Care Network Michigan (MI) |
| AAJ | Unassigned Prefix |
| AAK | Anthem BCBS of Indiana (IN) |
| AAL | Unassigned Prefix |
| AAM | BCBS of Alabama (AL) |
| AAN | Empire BCBS of New York (NY) |
| AAO | Blue shield(BS) of California (CA) |
| AAP | BCBS of Tennessee (TN) |
| AAQ | Anthem BCBS of Kentucky (KY) |
| AAR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AAS | Anthem BCBS of Indiana (IN) |
| AAT | Anthem Blue Cross(BC) of California (CA) |
| AAU | Anthem BCBS of Ohio (OH) |
| AAV | Anthem BCBS of Georgia (GA) |
| AAW | Unassigned Prefix |
| AAX | BCBS of South Carolina (SC) / Southcarolinablues |
| AAY | Blue Cross (BC) of Idaho (ID) |
| AAZ | Anthem BCBS of Indiana (IN) |
| ABA | BCBS of Illinois (IL) |
| ABB | BCBS of Arizona (AZ) |
| ABC | BCBS of Alabama (AL) |
| ABD | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| ABE | BCBS of Minnesota (MN) |
| ABF | Empire BCBS of New York (NY) |
| ABG | BCBS of Illinois (IL) |
| ABH | BCBS of Minnesota (MN) |
| ABI | Highmark BCBS of Pennsylvania (PA) |
| ABJ | BCBS of Minnesota (MN) |
| ABK | Carefirst BCBS of Maryland (MD) District of Columbia (DC) and Northern Virginia (VA) |
| ABL | BCBS of Illinois (IL) |
| ABM | BCBS of Alabama (AL) |
| ABN | Anthem BCBS of Nevada (NV) |
| ABO | Anthem Blue Cross(BC) of California (CA) |
| ABP | BCBS of North Carolina (NC) |
| ABQ | Carefirst BCBS of Maryland (MD) District of Columbia (DC) and Northern Virginia (VA) |
| ABR | Carefirst BCBS of Maryland (MD) District of Columbia (DC) and Northern Virginia (VA) |
| ABS | Wellmark |
| ABT | Anthem BCBS of Connecticut (CT) |
| ABU | BCBS of Minnesota (MN) |
| ABV | BCBS of Tennessee (TN) |
| ABW | Anthem BCBS of Colorado (CO) |
| ABX | Blue shield(BS) of California (CA) |
| ABY | Carefirst BCBS of Maryland (MD) / District of Columbia (DC) and Northern Virginia (VA) |
| ABZ | Anthem BCBS of Indiana (IN) |
| ACA | BCBS of Alabama (AL) |
| ACB | Unassigned Prefix |
| ACC | Unassigned Prefix |
| ACD | Empire BCBS of New York (NY) |
| ACE | Highmark BCBS of Pennsylvania (PA) |
| ACF | Premera Blue Cross (BC) of Alaska (AK) |
| ACG | BCBS of Tennessee (TN) |
| ACH | Empire BCBS of New York (NY) |
| ACI | Anthem BCBS of Kentucky (KY) |
| ACJ | Anthem BCBS of New Hampshire (NH) |
| ACK | Empire BCBS of New York (NY) |
| ACL | Blue Cross (BC) of Idaho (ID) |
| ACM | BCBS of Massachusetts (MA) |
| CAN | BCBS of Texas (TX) |
| ACO | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ACP | Unassigned Prefix |
| ACQ | Florida (FL) Blue |
| ACR | Anthem Blue Cross(BC) of California (CA) |
| ACS | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ACT | BCBS of Illinois (IL) |
| ACU | Blue shield(BS) of California (CA) |
| ACV | Wellmark |
| ACW | Anthem Blue Cross(BC) of California (CA) |
| ACX | BCBS of Illinois (IL) |
| ACY | Unassigned Prefix |
| ACZ | Anthem BCBS of Georgia (GA) |
| ADA | Anthem Blue Cross(BC) of California (CA) |
| ADB | Anthem BCBS of Missouri (MO) |
| |
| ADC | BCBS of Illinois (IL) |
| ADD | Anthem BCBS of Indiana (IN) |
| ADE | BCBS of Illinois (IL) |
| ADF | BCBS of Western New York (WNY) |
| ADG | Anthem BCBS of Missouri (MO) |
| ADH | Anthem BCBS of Ohio (OH) |
| ADI | Anthem Blue Cross(BC) of California (CA) |
| ADJ | BCBS of Nebraska (NE) |
| ADK | Anthem Blue Cross(BC) of California (CA) |
| ADL | Anthem BCBS of Indiana (IN) |
| ADM | BCBS of Illinois (IL) |
| AND | Anthem BCBS of Missouri (MO) |
| ADO | BCBS Blue Care Network Michigan (MI) |
| ADP | Empire BCBS of New York (NY) |
| ADQ | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| ADR | Wellmark |
| ADS | Unassigned Prefix |
| ADT | Unassigned Prefix |
| ADU | Florida (FL) Blue |
| ADV | BCBS of Illinois (IL) |
| ADW | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ADX | Florida(FL) Explore my plan |
| ADY | Unassigned Prefix |
| ADZ | Anthem BCBS of Missouri (MO) |
| AEA | BCBS of Texas (TX) |
| AEB | Unassigned Prefix |
| AEC | Anthem BCBS of Kentucky (KY) |
| AED | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AEE | Arkansas (AR) Blue Cross |
| AEF | BCBS of Illinois (IL) |
| AEG | Anthem BCBS of Ohio (OH) |
| AEH | Carefirst BCBS of Maryland (MD) / District of Columbia (DC) and Northern Virginia (VA) |
| AEI | Anthem BCBS of Virginia (VA) |
| AEJ | Unassigned Prefix |
| AEK | Anthem BCBS of Ohio (OH) |
| AEL | Anthem Blue Cross(BC) of California (CA) |
| AEM | Carefirst BCBS of Maryland (MD) / District of Columbia (DC) and Northern Virginia (VA) |
| AEN | Highmark BCBS of Pennsylvania (PA) |
| AEO | BCBS of Massachusetts (MA) |
| AEP | Wellmark |
| AEQ | BCBS Blue Care Network Michigan (MI) |
| AER | BCBS of Texas (TX) |
| AES | BCBS of Alabama (AL) |
| AET | Anthem Blue Cross(BC) of California (CA) |
| AEU | BCBS of Texas (TX) |
| AEV | BCBS of Texas (TX) |
| AEW | Florida (FL) Blue |
| AEX | BCBS of Texas (TX) |
| AEY | Unassigned Prefix |
| AEZ | BCBS of Illinois (IL) |
| AFA | Unassigned Prefix |
| AFB | BCBS of Kansas City |
| AFC | Wellmark |
| AFD | BCBS of South Carolina (SC) / Southcarolinablues |
| AFE | Blue shield(BS) of California (CA) |
| AFF | Unassigned Prefix |
| AFG | BCBS of Kansas City |
| AFH | Anthem BCBS of Ohio (OH) |
| AFI | BCBS of Rhode Island (RI) |
| AFJ | Anthem BCBS of Nevada (NV) |
| AFK | BCBS of South Carolina (SC) / Southcarolinablues |
| AFL | Unassigned Prefix |
| AFM | BCBS of Minnesota (MN) |
| AFN | Anthem BCBS of Ohio (OH) |
| AFO | Arkansas (AR) Blue Cross |
| AFP | Unassigned Prefix |
| AFQ | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AFR | Anthem Blue Cross(BC) of California (CA) |
| AFS | Unassigned Prefix |
| AFT | Anthem BCBS of Virginia (VA) |
| AFU | Anthem BCBS of Virginia (VA) |
| AFV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AFW | Unassigned Prefix |
| AFX | BCBS of Illinois (IL) |
| AFY | Highmark BCBS of Pennsylvania (PA) |
| AFZ | Anthem BCBS of Ohio (OH) |
| AGA | Anthem BCBS of Georgia (GA) |
| AGB | Excellus BCBS of New York (NY) |
| AGC | Empire BCBS of New York (NY) |
| AGD | Anthem BCBS of Indiana (IN) |
| AGE | Anthem BCBS of Ohio (OH) |
| AGF | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| AGG | Anthem BCBS of Ohio (OH) |
| AGH | Anthem BCBS of Georgia (GA) |
| AGI | Anthem BCBS of Nevada (NV) |
| AGJ | Blue Cross (BC) of Idaho (ID) |
| AGK | BCBS of Minnesota (MN) |
| AGL | Premera BCBS of Alaska (AK) |
| AGM | Blue Cross (BC) of Idaho (ID) |
| AGN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AGO | Unassigned Prefix |
| AGP | BCBS of Minnesota (MN) |
| AGQ | Carefirst BCBS of Maryland (MD)/District of Columbia (DC) and Northern Virginia (VA) |
| AGR | Anthem BCBS of Colorado (CO) |
| AGS | Anthem Blue Cross(BC) of California (CA) |
| AGT | Blue shield(BS) of California (CA) |
| AGU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AGV | BCBS of South Carolina (SC) / Southcarolinablues |
| AGW | Unassigned Prefix |
| AGX | Anthem BCBS of Virginia (VA) |
| AGY | Anthem BCBS of Wisconsin (WI) |
| AGZ | BCBS of Massachusetts (MA) |
| AHA | BCBS of Illinois (IL) |
| AHB | Anthem BCBS of Ohio (OH) |
| AHC | Premera Blue Cross (BC) of Alaska (AK) |
| AHD | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AHE | Empire BCBS of New York (NY) |
| AHF | Unassigned Prefix |
| AHG | BCBS of North Carolina (NC) |
| AHH | Anthem BCBS of Wisconsin (WI) |
| AHI | Unassigned Prefix |
| AHJ | Unassigned Prefix |
| AHK | Unassigned Prefix |
| AHL | Florida (FL) Blue |
| AHM | BCBS of Illinois (IL) |
| AHN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AHO | Unassigned Prefix |
| AHP | BCBS of Texas (TX) |
| AHQ | BCBS of Illinois (IL) |
| AHR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AHS | BCBS of Oklahoma (OK) |
| AHT | Anthem BCBS of Wisconsin (WI) |
| AHU | Unassigned Prefix |
| AHV | Anthem BCBS of Indiana (IN) |
| AHW | BCBS of Vermont (VT) |
| AHX | Anthem BCBS of Ohio (OH) |
| AHY | Unassigned Prefix |
| AHZ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AIA | BCBS of Texas (TX) |
| AIB | BCBS Blue Care Network Michigan (MI) |
| AIC | Unassigned Prefix |
| AID | Anthem BCBS of Ohio (OH) |
| AIE | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AIF | BCBS Blue Care Network Michigan (MI) |
| AIG | BCBS Blue Care Network Michigan (MI) |
| AIH | Anthem BCBS of Wisconsin (WI) |
| AII | BCBS of Louisiana(LA) |
| AIJ | Anthem BCBS of New Hampshire (NH) |
| AIK | BCBS Blue Care Network Michigan (MI) |
| AIL | Anthem BCBS of Wisconsin (WI) |
| AIM | BCBS of Massachusetts (MA) |
| AIN | Unassigned Prefix |
| AIO | Anthem BCBS of Virginia (VA) |
| AIP | Anthem BCBS of Nevada (NV) |
| AIQ | Unassigned Prefix |
| AIR | Capital Blue Cross of Pennsylvania |
| AIS | BCBS Blue Care Network Michigan (MI) |
| AIT | BCBS Blue Care Network Michigan (MI) |
| AIU | BCBS of Louisiana(LA) |
| AIV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AIW | BCBS of Illinois (IL) |
| AIX | BCBS of South Carolina (SC) / Southcarolinablues |
| AIY | Anthem BCBS of Indiana (IN) |
| AIZ | Florida (FL) Blue |
| AJA | BCBS of South Carolina (SC) / Southcarolinablues |
| AJB | BCBS of Louisiana(LA) |
| AJC | Blue shield(BS) of California (CA) |
| AJD | Anthem BCBS of Ohio (OH) |
| AJE | Florida (FL) Blue |
| AJF | BCBS of South Carolina (SC) / Southcarolinablues |
| AJG | BCBS of Illinois (IL) |
| AJH | BCBS of South Carolina (SC) / Southcarolinablues |
| AJI | Florida (FL) Blue |
| AJJ | Unassigned Prefix |
| AJK | BCBS of Illinois (IL) |
| AJL | BCBS of Texas (TX) |
| AJM | Unassigned Prefix |
| AJN | Unassigned Prefix |
| AJO | Anthem BCBS of Indiana (IN) |
| AJP | Unassigned Prefix |
| AJQ | Anthem Blue Cross(BC) of California (CA) |
| AJR | BCBS Blue Care Network Michigan (MI) |
| AJS | Anthem BCBS of Indiana (IN) |
| AJT | BCBS Blue Care Network Michigan (MI) |
| AJU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AJV | Florida (FL) Blue |
| AJW | Anthem BCBS of Kentucky (KY) |
| AJX | Premera BCBS of Alaska (AK) |
| AJY | BCBS of South Carolina (SC) / Southcarolinablues |
| AJZ | Unassigned Prefix |
| AKA | BCBS of Massachusetts (MA) |
| AKB | Anthem BCBS of Ohio (OH) |
| AKC | BCBS of South Carolina (SC) / Southcarolinablues |
| AKD | BCBS of Minnesota (MN) |
| AKE | Unassigned Prefix |
| AKF | Empire BCBS of New York (NY) |
| AKG | Unassigned Prefix |
| AKH | Anthem BCBS of Ohio (OH) |
| AKI | Anthem BCBS of Nevada (NV) |
| AKJ | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AKK | Anthem BCBS of Ohio (OH) |
| AKL | Anthem BCBS of Ohio (OH) |
| AKM | BCBS Blue Care Network Michigan (MI) |
| AKN | Anthem BCBS of Georgia (GA) |
| AKO | Unassigned Prefix |
| AKP | Unassigned Prefix |
| AKQ | Empire BCBS of New York (NY) |
| AKR | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AKS | Anthem Blue Cross(BC) of California (CA) |
| AKT | Anthem BCBS of Georgia (GA) |
| AKU | Unassigned Prefix |
| AKV | Empire BCBS of New York (NY) |
| AKW | BCBS of South Carolina (SC) / Southcarolinablues |
| AKX | Anthem BCBS of Kentucky (KY) |
| AKY | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AKZ | Anthem BCBS of Georgia (GA) |
| ALA | Wellmark |
| ALB | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ALC | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| ALD | Unassigned Prefix |
| ALE | BCBS of Texas (TX) |
| ALF | Wellmark |
| ALG | Unassigned Prefix |
| ALH | Unassigned Prefix |
| ALI | Anthem BCBS of Indiana (IN) |
| ALJ | Unassigned Prefix |
| ALK | Premera BCBS of Alaska (AK) |
| ALL | Anthem BCBS of Ohio (OH) |
| ALM | Anthem BCBS of Ohio (OH) |
| ALN | Highmark BCBS of Pennsylvania (PA) |
| ALO | Wellmark |
| ALP | Anthem BCBS of Connecticut (CT) |
| ALQ | Unassigned Prefix |
| ALR | Anthem BCBS of Connecticut (CT) |
| ALS | BCBS Blue Care Network Michigan (MI) |
| ALT | BCBS of Texas (TX) |
| ALU | Highmark BCBS of Western Virginia (WV) |
| ALV | Premera BCBS of Alaska (AK) |
| ALW | Blue Cross (BC) of Idaho (ID) |
| ALX | Anthem BCBS of Ohio (OH) |
| ALY | Unassigned Prefix |
| ALZ | Unassigned Prefix |
| AMA | BCBS of Illinois (IL) |
| AMB | Anthem BCBS of Nevada (NV) |
| AMC | Unassigned Prefix |
| AMD | Anthem BCBS of Indiana (IN) |
| AME | Blue shield(BS) of California (CA) |
| AMF | Anthem BCBS of Wisconsin (WI) |
| AMG | BCBS of Illinois (IL) |
| AMH | Anthem BCBS of Nevada (NV) |
| AMI | Blue Cross (BC) of Idaho (ID) |
| AMJ | Anthem BCBS of Ohio (OH) |
| AMK | Premera BCBS of Alaska (AK) |
| AML | Wellmark |
| AMM | Highmark BCBS of Pennsylvania (PA) |
| AMN | Blue Cross (BC) of Idaho (ID) |
| AMO | Unassigned Prefix |
| AMP | Blue shield(BS) of California (CA) |
| AMQ | Highmark BCBS of Pennsylvania (PA) |
| AMR | BCBS of Texas (TX) |
| AMS | BCBS of Illinois (IL) |
| AMT | Blue Cross (BC) of Idaho (ID) |
| AMU | Anthem BCBS of Virginia (VA) |
| AMV | Anthem BCBS of Wisconsin (WI) |
| AMW | Anthem BCBS of Wisconsin (WI) |
| AMX | BCBS of North Carolina (NC) |
| AMY | Anthem BCBS of Kentucky (KY) |
| AMZ | Anthem BCBS of Wisconsin (WI) |
| ANA | BCBS of Massachusetts (MA) |
| ANB | Anthem BCBS of Wisconsin (WI) |
| ANC | BCBS of Nebraska (NE) |
| AND | BCBS of Illinois (IL) |
| ANE | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| ANF | Unassigned Prefix |
| ANG | Unassigned Prefix |
| ANH | Anthem BCBS of Kentucky (KY) |
| ANI | Florida (FL) Blue |
| ANJ | Anthem Blue Cross(BC) of California (CA) |
| ANK | Anthem BCBS of Wisconsin (WI) |
| ANL | Unassigned Prefix |
| ANM | Unassigned Prefix |
| ANN | Anthem BCBS of Ohio (OH) |
| ANO | BCBS of Illinois (IL) |
| ANP | Anthem BCBS of Nevada (NV) |
| ANQ | Florida (FL) Blue |
| ANR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ANS | Blue shield(BS) of California (CA) |
| ANT | Anthem BCBS of Ohio (OH) |
| ANU | Anthem BCBS of Ohio (OH) |
| ANV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ANW | Anthem BCBS of Missouri (MO) |
| ANX | Anthem BCBS of Wisconsin (WI) |
| ANY | BCBS of Illinois (IL) |
| ANZ | Wellmark |
| AOA | Anthem BCBS of Ohio (OH) |
| AOB | BCBS Blue Care Network Michigan (MI) |
| AOC | Anthem BCBS of Missouri (MO) |
| AOD | BCBS of Western New York (WNY) |
| AOE | Anthem Blue Cross(BC) of California (CA) |
| AOF | Wellmark |
| AOG | BCBS of Western New York (WNY) |
| AOH | BCBS of Western New York (WNY) |
| AOI | BCBS of Texas (TX) |
| AOJ | BCBS of Western New York (WNY) |
| AOK | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AOL | Unassigned Prefix |
| AOM | Highmark BCBS of Pennsylvania (PA) |
| AON | BCBS of Illinois (IL) |
| AOO | BCBS of Minnesota (MN) |
| AOP | Blue shield(BS) of Northeastern New York (NeNY) |
| AOQ | BCBS of Western New York (WNY) |
| AOR | BCBS of Western New York (WNY) |
| AOS | BCBS of Tennessee (TN) |
| AOT | Anthem BCBS of Missouri (MO) |
| AOU | Unassigned Prefix |
| AOV | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| AOW | BCBS Blue Care Network Michigan (MI) |
| AOX | BCBS of North Carolina (NC) |
| AOY | Blue Cross (BC) of Idaho (ID) |
| AOZ | Anthem Blue Cross(BC) of California (CA) |
| APA | Wellmark |
| APB | Arkansas (AR) Blue Cross |
| APC | Anthem BCBS of Ohio (OH) |
| APD | BCBS of Illinois (IL) |
| APE | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| APF | Unassigned Prefix |
| APG | Anthem BCBS of Connecticut (CT) |
| APH | Anthem BCBS of Connecticut (CT) |
| API | BCBS of Western New York (WNY) |
| APJ | BCBS of Massachusetts (MA) |
| APK | BCBS of Arizona (AZ) |
| APL | Unassigned Prefix |
| APM | Highmark BCBS of Pennsylvania (PA) |
| APN | Anthem BCBS of Indiana (IN) |
| APO | Anthem Blue Cross(BC) of California (CA) |
| APP | Wellmark |
| APQ | Anthem BCBS of Connecticut (CT) |
| APR | Anthem BCBS of Connecticut (CT) |
| APS | BCBS of South Carolina (SC) / Southcarolinablues |
| APT | Unassigned Prefix |
| APU | BCBS of Minnesota (MN) |
| APV | BCBS of Illinois (IL) |
| APW | BCBS of Massachusetts (MA) |
| APX | Blue Shield (BS) of California |
| APY | Highmark BCBS of Pennsylvania (PA) |
| APZ | Unassigned Prefix |
| AQA | Florida (FL) Blue |
| AQB | BCBS of Rhode Island (RI) |
| AQC | Anthem BCBS of Ohio (OH) |
| AQD | Anthem BCBS of Ohio (OH) |
| AQE | Blue Cross (BC) of Idaho (ID) |
| AQF | Wellmark |
| AQG | Anthem BCBS of Wisconsin (WI) |
| AQH | BCBS of Massachusetts (MA) |
| AQI | Anthem BCBS of Kentucky (KY) |
| AQJ | Premera BCBS of Alaska (AK) |
| AQK | BCBS of Minnesota (MN) |
| AQL | Highmark BCBS of Pennsylvania (PA) |
| AQM | Unassigned Prefix |
| AQN | Anthem BCBS of Georgia (GA) |
| AQO | Unassigned Prefix |
| AQP | BCBS of South Carolina (SC) / Southcarolinablues |
| AQQ | BCBS Blue Care Network Michigan (MI) |
| AQR | Anthem BCBS of Georgia (GA) |
| AQS | Blue Shield (BS) of California |
| AQT | Premera BCBS of Alaska (AK) |
| AQU | BCBS of Kansas City |
| AQV | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AQW | Unassigned Prefix |
| AQX | Empire BCBS of New York (NY) |
| AQY | BCBS of Alabama (AL) |
| AQZ | BCBS of Illinois (IL) |
| ARA | BCBS of Western New York (WNY) |
| ARB | BCBS of Texas (TX) |
| ARC | Anthem Blue Cross(BC) of California (CA) |
| ARD | BCBS of New Mexico (NM) |
| ARE | Anthem BCBS of Georgia (GA) |
| ARF | Unassigned Prefix |
| ARG | Highmark BCBS of Pennsylvania (PA) |
| ARH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ARI | Unassigned Prefix |
| ARJ | Anthem BCBS of Missouri (MO) |
| ARK | Anthem Blue Cross(BC) of California (CA) |
| ARL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ARM | Blue Shield (BS) of California |
| ARN | BCBS of Alabama (AL) |
| ARO | Unassigned Prefix |
| ARP | BCBS of Illinois (IL) |
| ARQ | Anthem BCBS of Georgia (GA) |
| ARR | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| ARS | BCBS of Texas (TX) |
| ART | BCBS of Minnesota (MN) |
| ARU | BCBS of Texas (TX) |
| ARV | Anthem Blue Cross(BC) of California (CA) |
| ARW | Anthem BCBS of Missouri (MO) |
| ARX | BCBS of Kansas |
| ARY | Anthem BCBS of Connecticut (CT) |
| ARZ | Highmark BCBS of Pennsylvania (PA) |
| ASA | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ASB | Excellus BCBS of New York (NY) |
| ASC | Unassigned Prefix |
| ASD | BCBS of Illinois (IL) |
| ASE | BCBS of North Carolina (NC) |
| ASF | BCBS of Illinois (IL) |
| ASG | Excellus BCBS of New York (NY) |
| ASH | Anthem BCBS of Kentucky (KY) |
| ASI | BCBS of Kansas City |
| ASJ | Anthem BCBS of Kentucky (KY) |
| ASK | Wellmark |
| ASL | Horizon BCBS of New Jersey (NJ) |
| ASM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ASN | Unassigned Prefix |
| ASO | Anthem BCBS of Indiana (IN) |
| ASP | BCBS of Massachusetts (MA) |
| ASQ | Anthem BCBS of Wisconsin (WI) |
| ASR | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| ASS | Unassigned Prefix |
| AST | BCBS of Tennessee (TN) |
| ASU | Anthem BCBS of Georgia (GA) |
| ASV | Carefirst BCBS of Maryland (MD)/District of Columbia (DC) and Northern Virginia (VA) |
| ASW | Unassigned Prefix |
| ASX | Anthem BCBS of Georgia (GA) |
| ASY | BCBS Blue Care Network Michigan (MI) |
| ASZ | Anthem BCBS of Ohio (OH) |
| ATA | BCBS of Illinois (IL) |
| ATB | Wellmark |
| ATC | BCBS Blue Care Network Michigan (MI) |
| ATD | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| ATE | Empire BCBS of New York (NY) |
| ATF | Unassigned Prefix |
| ATG | Carefirst BCBS of Maryland (MD)/District of Columbia (DC) and Northern Virginia (VA) |
| ATH | BCBS of Massachusetts (MA) |
| ATI | BCBS of Alabama (AL) |
| ATJ | Anthem BCBS of Connecticut (CT) |
| ATK | Anthem BCBS of Connecticut (CT) |
| ATL | Unassigned Prefix |
| ATM | Anthem BCBS of Maine (ME) |
| ATN | Anthem BCBS of Missouri (MO) |
| ATO | BCBS of Illinois (IL) |
| ATP | Wellmark |
| ATQ | Blue Shield (BS) of California |
| ATR | Anthem Blue Cross(BC) of California (CA) |
| ATS | BCBS of Illinois (IL) |
| ATT | Unassigned Prefix |
| ATU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ATV | BCBS of Illinois (IL) |
| ATW | Anthem BCBS of Virginia (VA) |
| ATX | Unassigned Prefix |
| ATY | BCBS of South Carolina (SC) / Southcarolinablues |
| ATZ | BCBS of Illinois (IL) |
| AUA | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| AUB | BCBS Blue Care Network Michigan (MI) |
| AUC | Unassigned Prefix |
| AUD | Unassigned Prefix |
| AUE | Anthem BCBS of Virginia (VA) |
| AUF | Anthem BCBS of Georgia (GA) |
| AUG | BCBS Blue Care Network Michigan (MI) |
| AUH | Highmark BCBS of Pennsylvania (PA) |
| AUI | Unassigned Prefix |
| AUJ | Anthem BCBS of Wisconsin (WI) |
| AUK | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| AUL | Empire BCBS of New York (NY) |
| AUM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AUN | Unassigned Prefix |
| AUO | Unassigned Prefix |
| AUP | BCBS Blue Care Network Michigan (MI) |
| AUQ | Anthem BCBS of Wisconsin (WI) |
| AUR | Anthem BCBS of Wisconsin (WI) |
| AUS | Blue Shield (BS) of California |
| AUT | Florida (FL) Blue |
| AUU | Unassigned Prefix |
| AUV | BCBS Blue Care Network Michigan (MI) |
| AUW | Highmark BCBS of Delaware (DE) |
| AUX | BCBS of Massachusetts (MA) |
| AUY | Wellmark |
| AUZ | BCBS of Texas (TX) |
| AVA | BCBS of Minnesota (MN) |
| AVB | Carefirst BCBS of Maryland (MD)/District of Columbia (DC) and Northern Virginia (VA) |
| AVC | BCBS of South Carolina (SC) / Southcarolinablues |
| AVD | BCBS of Minnesota (MN) |
| AVE | Empire BCBS of New York (NY) |
| AVF | BCBS of Western New York (WNY) |
| AVG | BCBS of New Mexico (NM) |
| AVH | Unassigned Prefix |
| AVI | Anthem BCBS of Virginia (VA) |
| AVJ | Unassigned Prefix |
| AVK | Blue Shield (BS) of California |
| AVL | Premera BCBS of Alaska (AK) |
| AVM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AVN | Premera BCBS of Alaska (AK) |
| AVO | Anthem BCBS of Virginia (VA) |
| AVP | Anthem BCBS of Georgia (GA) |
| AVQ | Unassigned Prefix |
| AVR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AVS | Unassigned Prefix |
| AVT | Anthem Blue Cross(BC) of California (CA) |
| AVU | Unassigned Prefix |
| AVV | Premera BCBS of Alaska (AK) |
| AVW | BCBS of Massachusetts (MA) |
| AVX | Empire BCBS of New York (NY) |
| AVY | BCBS of Texas (TX) |
| AVZ | Anthem BCBS of Connecticut (CT) |
| AWA | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AWB | Premera BCBS of Alaska (AK) |
| AWC | Anthem BCBS of Connecticut (CT) |
| AWD | BCBS of Minnesota (MN) |
| AWE | Anthem BCBS of Connecticut (CT) |
| AWF | BCBS of Illinois (IL) |
| AWG | Unassigned Prefix |
| AWH | Unassigned Prefix |
| AWI | BCBS of Alabama (AL) |
| AWJ | Premera BCBS of Alaska (AK) |
| AWK | Wellmark |
| AWL | Anthem BCBS of Connecticut (CT) |
| AWM | Highmark BCBS of Pennsylvania (PA) |
| AWN | BCBS of Illinois (IL) |
| AWO | BCBS of Illinois (IL) |
| AWP | Anthem Blue Cross(BC) of California (CA) |
| AWQ | Regence BCBS of Oregon (OR) and Utah (UT) |
| |
| * | Regence Blue Shield (BS) of Idaho (ID) and select counties of Washington (WA) |
| AWR | Highmark BCBS of Pennsylvania (PA) |
| AWS | Wellmark |
| AWT | Anthem BCBS of Connecticut (CT) |
| AWU | Unassigned Prefix |
| AWV | Anthem BCBS of Connecticut (CT) |
| AWW | BCBS of Alabama (AL) |
| AWX | Anthem BCBS of Ohio (OH) |
| AWY | Anthem BCBS of Connecticut (CT) |
| AWZ | BCBS of Alabama (AL) |
| AXA | BCBS of Nebraska (NE) |
| AXB | Highmark BCBS of Delaware (DE) |
| AXC | Arkansas (AR) Blue Cross |
| AXD | BCBS of Massachusetts (MA) |
| AXE | Anthem BCBS of Indiana (IN) |
| AXF | Anthem BCBS of Georgia (GA) |
| AXG | Florida (FL) Blue |
| AXH | Unassigned Prefix |
| AXI | Unassigned Prefix |
| AXJ | Anthem BCBS of Nevada (NV) |
| AXK | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AXL | BCBS Blue Care Network Michigan (MI) |
| AXM | BCBS of Illinois (IL) |
| AXN | Unassigned Prefix |
| AXO | Blue Shield (BS) of California |
| AXP | BCBS of Massachusetts (MA) |
| AXQ | BCBS of Minnesota (MN) |
| AXR | BCBS of South Carolina (SC) / Southcarolinablues |
| AXS | BCBS of Massachusetts (MA) |
| AXT | BCBS of Illinois (IL) |
| AXU | Anthem BCBS of Georgia (GA) |
| AXV | BCBS of Illinois (IL) |
| AXW | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AXX | BCBS of Alabama (AL) |
| AXY | Unassigned Prefix |
| AXZ | Unassigned Prefix |
| AYA | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AYB | Blue Shield (BS) of California |
| AYC | BCBS of Texas (TX) |
| AYD | Florida (FL) Blue |
| AYE | Wellmark |
| AYF | BCBS of Illinois (IL) |
| AYG | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| AYH | BCBS of Massachusetts (MA) |
| AYI | BCBS of Tennessee (TN) |
| AYJ | Anthem Blue Cross(BC) of California (CA) |
| AYK | Anthem Blue Cross(BC) of California (CA) |
| AYL | Unassigned Prefix |
| AYM | Unassigned Prefix |
| AYN | BCBS of Alabama (AL) |
| AYO | Unassigned Prefix |
| AYP | Unassigned Prefix |
| AYQ | BCBS of Massachusetts (MA) |
| AYR | Highmark BCBS of Pennsylvania (PA) |
| AYS | Premera BCBS of Alaska (AK) |
| AYT | Anthem BCBS of Nevada (NV) |
| AYU | Anthem BCBS of Wisconsin (WI) |
| AYV | Unassigned Prefix |
| AYW | BCBS of Western New York (WNY) |
| AYX | Anthem BCBS of Wisconsin (WI) |
| AYY | Blue Shield (BS) of California |
| AYZ | BCBS of North Carolina (NC) |
| AZA | BCBS of North Carolina (NC) |
| AZB | Anthem BCBS of Connecticut (CT) |
| AZC | Anthem BCBS of Colorado (CO) |
| AZD | Unassigned Prefix |
| AZE | BCBS of Illinois (IL) |
| AZF | BCBS of Mississippi (MS) |
| AZG | Unassigned Prefix |
| AZH | BCBS of Texas (TX) |
| AZI | Unassigned Prefix |
| AZJ | Anthem BCBS of Connecticut (CT) |
| AZK | BCBS of Massachusetts (MA) |
| AZL | Anthem BCBS of Connecticut (CT) |
| AZM | Unassigned Prefix |
| AZN | Excellus BCBS of New York (NY) |
| AZO | Blue Shield (BS) of California |
| AZP | Unassigned Prefix |
| AZQ | Unassigned Prefix |
| AZR | Unassigned Prefix |
| AZS | Blue Shield (BS) of California |
| AZT | Blue Shield (BS) of California |
| AZU | Anthem Blue Cross(BC) of California (CA) |
| AZV | Anthem Blue Cross(BC) of California (CA) |
| AZW | BCBS of Illinois (IL) |
| AZX | Anthem BCBS of Georgia (GA) |
| AZY | Blue Shield (BS) of California |
| AZZ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
