| CAO CBC CBE CBL CBN CBX CCE CCG CCN CCP CCS CCT CCU CDB CDD CDE CDH CEK CEN CER CEU CFP CFQ CFW CGM CGU CHE CHI CHJ CHN CHW CHZ CIG CIL CIM CJD CJP CJW CKC CKD CKF CKK CKT CKZ CLA CLG CLK CLP CLQ CLX CML CMO CNA CND CNN CNO CNP CNQ CNS COE COF COH COI COK COL COQ COR COU COW COZ CPI CPO CPX CQC CQD CQF CQG CQL CQP CQR CQT CQU CQW CQZ CRD CRJ CRT CRV CSE CSN CSW CSY CTE CTN CTP CTV CUA CUC CUE CUJ CUL CUM CVH CVQ CVW CWC CWJ CWL CXA CXE CXL CXM CXN CXU CXV CXW CXY CYD CYF CYH CYM CYN CYW CZD CZF CZJ CZL CZM CZO CZX CZZ | Alpha prefix not assigned or unallocated |
| CBH CBW COG CQQ CSF CSS CST CUH | Anthem Blue Cross Blue Shield of Colorado |
| CDT CGT CTG CVN CZC CZH CZT | Anthem Blue Cross Blue Shield of Connecticut |
| CAH CFC CII CKI CLD CLF CLW CPV CSH CWS CXS CYJ CYT | Anthem Blue Cross Blue Shield of Georgia |
| CDJ CFD CIW CKH CKJ CKW CMJ CSG CTD CTJ CTR CVA CVE CVR CZB | Anthem Blue Cross Blue Shield of Indiana |
| CDF CGG CHQ CZA | Anthem Blue Cross Blue Shield of Kentucky |
| CAC CGH CGS CGX CIX CKS CMD CQE CSJ CSQ CWH CWX | Anthem Blue Cross Blue Shield of Missouri |
| CBS | Anthem Blue Cross Blue Shield of New Hampshire |
| CBF CBI CBK CBP CBT CEF CFY CFZ CGZ CHL CJC CJO CJX CJY CKB CKQ CKU CKV CLJ CMK CMT CMZ CNB CNH COD CRI CRR CUZ CVF CVG CVP CVY CWB CWG CWQ CZP CZQ | Anthem Blue Cross Blue Shield of Ohio |
| CEA CIU CLU CMB CNY CRO CSV CVO CVU CZK | Anthem Blue Cross Blue Shield of Virginia |
| CAB CAR CBR CJR CRQ CVM CWR | Anthem Blue Cross Blue Shield of Wisconsin |
| CAI CAX CBA CBM CBQ CCV CEM CFH CGA CLL CPQ CPR CPT CQB CRW CZU | Anthem Bluecross of California |
| CDN CSM CXO | Arkansas Blue Cross Blue Shield |
| CBG CHA CIP COJ COM COP CPC CPS CSA CUK CVI | Blue Cross Blue Shield of Alabama |
| CDC CGF COV CTZ | Blue Cross Blue Shield of Arizona |
| CAN CBY CCF CCL CDA CDU CDX CEC CED CEJ CEP CEV CEX CEY CEZ CFR CGO CHG CHR CHV CIB CIF CJB CJS CJU CLB CME CMR CNL CNT CNV CNZ CPE CPH CPY CRM CRP CSB CTL CTY CUT CUV CVC CVX CXD CXT CYA CYC CYL CYP CYS | Blue Cross Blue Shield of Illinois |
| CJG CPL CSI | Blue Cross Blue Shield of Kansas City |
| CBO CBV CES CHO | Blue Cross Blue Shield of Louisiana |
| CAD CAY CDW CEH CEL CFM CFN CGJ CHB CJK CKO CLS CMM CMS CON CPD CTA CTI CUD CWK CWO CYI CYO | Blue Cross Blue Shield of Massachusetts |
| CCI CCJ CMA CRH CWE | Blue Cross Blue Shield of Michigan |
| CAL CAZ CCK CCX CGL CGW CMP CNX COO CPA CRB CTF CXG CXH CZW | Blue Cross Blue Shield of Minnesota |
| CAF CLO | Blue Cross Blue Shield of Mississippi |
| CEO CGN CHM CJF CPU CTS CXI | Blue Cross Blue Shield of Nebraska |
| CFG CGQ CHS CHX CID CJH CLN CPF CRF CRN CRX CYX CYY CZY | Blue Cross Blue Shield of North Carolina |
| CTC | Blue Cross Blue Shield of Oklahoma |
| CXC CXR | Blue Cross Blue Shield of Rhode Island |
| CBJ CCD CDV CFE CFL CGC CHY CLC CNJ CSZ CTB CTH | Blue Cross Blue Shield of South Carolina |
| CHH CHT CIQ CKG CKR CMH CRY | Blue Cross Blue Shield of Tennessee |
| CAP CAS CBB CCM CEE CGE CHF CJT CKP CLE CNC CNI COB CQJ CRG CRK CRZ CUU CWP CWT CXK CXP CYR CZE | Blue Cross Blue Shield of Texas |
| CQS CRU CTQ CUR | Blue Cross Blue Shield of Western New York |
| CCC CIJ CJQ CMY COT CTM CWF CXB | Bluecross of Idaho |
| CAG CAK CAW CCZ CET CGB CGD CKE CKX CKY CMV COX CQK CQN CRE CSR CTO CTU CTX CUF CUQ CWI CXX CYB CZI | Blueshield of California |
| CDS CMN CPG CPZ | Blueshield of Northeastern New York |
| CHP CIK CIO CIV COA COY CRA CRC CTK | Capital Bluecross of Pennsylvania |
| CAA CAU CCB CCW CDI CDL CDR CDY CEG CEI CFI CFO CFU CGK CGR CGV CHC CHD CHU CIA CIC CIH CIN CIZ CKA CKL CLV CLZ CNR CNU CNW COC CPB CPJ CPM CPN CQI CQO CSD CSO CVD CVT CVV CWA CWN CWU CWV CXZ CZG | Carefirst Blue Cross Blue Shield(Maryland/District of Columbia/Northern Virginia) |
| CAE CCA CDK CFT CJE CJL CJV CWZ CYU | Empire Blue Cross Blue Shield of New York |
| CGP CLH CMX CRL CSP CUB CXJ | Excellus Blue Cross Blue Shield of New York |
| CGY CIT CIY CJM CJN CSC CVB CVJ CVK CYG CYK | Florida Blue |
| CBD CDM CFF CKM CMU CNG CNM CQM CUN CWM | Highmark Blue Cross Blue Shield of Pennsylvania |
| CAM CJI | Highmark Blue Cross Blue Shield of West Virginia |
| CBU CBZ CFS CSL | Horizon Blue Cross Blue Shield of New Jersey |
| CAT CCO CCQ CDQ CDZ CFA CJA CMI COS CQA CQX CUI CUO CUS CYQ CZN CZS CZV | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| CAQ CAV CFX CIR CJJ CLR CRS CTT CTW CXF | Premera Bluecross of Alaska |
| CIS CKN CMQ CPK CQH CSU CUX CUY CVL CYE CYV CYZ | Regence Blue Cross Blue Shield(Oregon/Idaho/Utah/Washington) |
| CAJ CCH CCR CCY CDG CDO CDP CEB CEQ CEW CFB CFJ CFK CFV CGI CHK CIE CJZ CLI CLM CLT CLY CMC CMF CMG CMW CNE CNF CNK CPP CPW CQV CQY CSK CSX CUG CUP CUW CVS CVZ CWD CWW CWY CXQ CZR | Wellmark Blue Cross Blue Shield of South Dakota/Iowa |