| AAJ AAL AAW ACB ACC ACP ACY ADS ADT ADY AEB AEJ AEY AFA AFF AFL AFP AFS AFW AGO AGW AHF AHI AHJ AHK AHO AHU AHY AIC AIN AIQ AJJ AJM AJN AJP AJZ AKE AKG AKO AKP AKU ALD ALG ALH ALJ ALQ ALY ALZ AMC AMO ANF ANG ANL ANM AOL AOU APF APL APT APZ AQM AQO AQW ARF ARI ARO ASC ASN ASS ASW ATF ATL ATT ATX AUC AUD AUI AUN AUO AUU AVH AVJ AVQ AVS AVU AWG AWH AWU AXH AXI AXN AXY AXZ AYL AYM AYO AYP AYV AZD AZG AZI AZM AZP AZQ AZR | Alpha Prefix not assigned or unallocated |
| ABW AGR AZC | Anthem Blue Cross Blue Shield of Colorado |
| ABT ALP ALR APG APH APQ APR ARY ATJ ATK AVZ AWC AWE AWL AWT AWV AWY AZB AZJ AZL | Anthem Blue Cross Blue Shield of Connecticut |
| AAG AAV ACZ AGA AGH AKN AKT AKZ AQN AQR ARE ARQ ASU ASX AUF AVP AXF AXU AZX | Anthem Blue Cross Blue Shield of Georgia |
| AAK AAS AAZ ABZ ADD ADL AGD AHV AIY AJO AJS ALI AMD APN ASO AXE | Anthem Blue Cross Blue Shield of Indiana |
| AAQ ACI AEC AJW AKX AMY ANH AQI ASH ASJ | Anthem Blue Cross Blue Shield of Kentucky |
| ATM | Anthem Blue Cross Blue Shield of Maine |
| ADB ADG ADN ADZ ANW AOC AOT ARJ ARW ATN | Anthem Blue Cross Blue Shield of Missouri |
| AAE ABN AFJ AGI AIP AKI AMB AMH ANP AXJ AYT | Anthem Blue Cross Blue Shield of Nevada |
| ACJ AIJ | Anthem Blue Cross Blue Shield of New Hampshire |
| AAU ADH AEG AEK AFH AFN AFZ AGE AGG AHB AHX AID AJD AKB AKH AKK AKL ALL ALM ALX AMJ ANN ANT ANU AOA APC AQC AQD ASZ AWX | Anthem Blue Cross Blue Shield of Ohio |
| AEI AFT AFU AGX AIO AMU ATW AUE AVI AVO | Anthem Blue Cross Blue Shield of Virginia |
| AGY AHH AHT AIH AIL AMF AMV AMW AMZ ANB ANK ANX AQG ASQ AUJ AUQ AUR AYU AYX | Anthem Blue Cross Blue Shield of Wisconsin |
| AAT ABO ACR ACW ADA ADI ADK AEL AET AFR AGS AJQ AKS ANJ AOE AOZ APO ARC ARK ARV ATR AVT AWP AYJ AYK AZU AZV | Anthem Bluecross of California |
| AEE AFO APB AXC | Arkansas Blue Cross Blue Shield |
| AAA AAM ABC ABM ACA AES AQY ARN ATI AWI AWW AWZ AXX AYN | Blue Cross Blue Shield of Alabama |
| AAF ABB APK | Blue Cross Blue Shield of Arizona |
| AAC ABA ABG ABL ACT ACX ADC ADE ADM ADV AEF AEZ AFX AHA AHM AHQ AIW AJG AJK AMA AMG AMS AND ANO ANY AON APD APV AQZ ARP ASD ASF ATA ATO ATS ATV ATZ AWF AWN AWO AXM AXT AXV AYF AZE AZW | Blue Cross Blue Shield of Illinois |
| ARX | Blue Cross Blue Shield of Kansas |
| AFB AFG AQU ASI | Blue Cross Blue Shield of Kansas City |
| AII AIU AJB | Blue Cross Blue Shield of Louisiana |
| ACM AEO AGZ AIM AKA ANA APJ APW AQH ASP ATH AUX AVW AXD AXP AXS AYH AYQ AZK | Blue Cross Blue Shield of Massachusetts |
| AAB AAI ADO AEQ AIB AIF AIG AIK AIS AIT AJR AJT AKM ALS AOB AOW AQQ ASY ATC AUB AUG AUP AUV AXL | Blue Cross Blue Shield of Michigan |
| ABE ABH ABJ ABU AFM AGK AGP AKD AOO APU AQK ART AVA AVD AWD AXQ | Blue Cross Blue Shield of Minnesota |
| AZF | Blue Cross Blue Shield of Mississippi |
| ADJ ANC AXA | Blue Cross Blue Shield of Nebraska |
| ARD AVG | Blue Cross Blue Shield of New Mexico |
| ABP AHG AMX AOX ASE AYZ AZA | Blue Cross Blue Shield of North Carolina |
| AHS | Blue Cross Blue Shield of Oklahoma |
| AFI AQB | Blue Cross Blue Shield of Rhode Island |
| AAD AAX AFD AFK AGV AIX AJA AJF AJH AJY AKC AKW APS AQP ATY AVC AXR | Blue Cross Blue Shield of South Carolina |
| AAP ABV ACG AOS AST AYI | Blue Cross Blue Shield of Tennessee |
| ACN AEA AER AEU AEV AEX AHP AIA AJL ALE ALT AMR AOI ARB ARS ARU AUZ AVY AYC AZH | Blue Cross Blue Shield of Texas |
| AHW | Blue Cross Blue Shield of Vermont |
| ADF AOD AOG AOH AOJ AOQ AOR API ARA AVF AYW | Blue Cross Blue Shield of Western New York |
| AAY ACL AGJ AGM ALW AMI AMN AMT AOY AQE | Bluecross of Idaho |
| AAH AAO ABX ACU AFE AGT AJC AME AMP ANS APX AQS ARM ATQ AUS AVK AXO AYB AYY AZO AZS AZT AZY | Blueshield of California |
| AOP | Blueshield of Northeastern New York |
| AIR | Capital Bluecross of Pennsylvania |
| AAR ABK ABQ ABR ABY ACO ACS ADW AED AEH AEM AFV AGN AGQ AGU AHD AHN AHR AHZ AIE AIV AJU AKY ALB ANR ANV ARH ARL ASA ASM ASV ATG ATU AUM AVB AVM AVR AXK AXW AYA AYG AZZ | Carefirst Blue Cross Blue Shield(Maryland/District of Columbia/Northern Virginia) |
| AAN ABF ACD ACH ACK ADP AGC AHE AKF AKQ AKV AQX ATE AUL AVE AVX | Empire Blue Cross Blue Shield of New York |
| AGB ASB ASG AZN | Excellus Blue Cross Blue Shield of New York |
| ACQ ADU AEW AHL AIZ AJE AJI AJV ANI ANQ AQA AUT AXG AYD | Florida Blue |
| ADX | Florida Explore-my-plan |
| AUW AXB | Highmark Blue Cross Blue Shield of Delaware |
| ABI ACE AEN AFY ALN AMM AMQ AOM APM APY AQL ARG ARZ AUH AWM AWR AYR | Highmark Blue Cross Blue Shield of Pennsylvania |
| ALU | Highmark Blue Cross Blue Shield of West Virginia |
| ASL | Horizon Blue Cross Blue Shield of New Jersey |
| ADQ AGF AOV ARR ASR AUA AUK | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ACF AGL AHC AJX ALK ALV AMK AQJ AQT AVL AVN AVV AWB AWJ AYS | Premera Blue Cross Blue Shield of Alaska |
| ABD AFQ AKJ AKR ALC ANE AOK APE AQV ATD AWA AWQ | Regence Blue Cross Blue Shield(Oregon/Idaho/Utah/Washington) |
| ABS ACV ADR AEP AFC ALA ALF ALO AML ANZ AOF APA APP AQF ASK ATB ATP AUY AWK AWS AYE | Wellmark Blue Cross Blue Shield of South Dakota/Iowa |