BCBS alpha prefix list CAA-CZZ. There are total of 795 alpha prefix in BCBS CAA-CZZ list and 41 are Not Assigned prefixes out of 795.
| BCBS Prefix | BCBS Plan Name |
| C2A | Blue Cross Blue Shield Texas |
| C2B | Highmark BCBS Pennsylvania |
| C2C | Blue Shield Northeastern New York |
| C2E | Premera Blue Cross |
| C2F | Highmark BCBS Pennsylvania |
| C2G | Blue Cross Blue Shield Minnesota |
| C2H | Blue Cross Blue Shield Alabama |
| C2I | Highmark BCBS Pennsylvania |
| C2J | Blue Cross California |
| C2K | Blue Cross Blue Shield Minnesota |
| C2L | Highmark BCBS Pennsylvania |
| C2M | Blue Cross California |
| C2N | Highmark BCBS Pennsylvania |
| C2Q | Independence Blue Cross |
| C2R | Blue Cross Blue Shield Illinois |
| C2S | Blue Cross Blue Shield Illinois |
| C2V | Premera Blue Cross |
| C2W | Regence Blue Cross Blue Shield Oregon |
| C2Y | Blue Cross Blue Shield Minnesota |
| C2Z | Anthem Blue Cross California |
| C3A | Regence Blue Cross Blue Shield Oregon |
| C3C | Regence Blue Cross Blue Shield Oregon |
| C3D | Premera Blue Cross |
| C3E | Blue Cross Blue Shield Texas |
| C3F | Highmark BCBS Pennsylvania |
| C3G | Anthem Blue Cross California |
| C3J | Anthem BCBS Indiana |
| C3K | Highmark BCBS Pennsylvania |
| C3L | Highmark BCBS Pennsylvania |
| C3M | Highmark BCBS Pennsylvania |
| C3N | Blue Cross Blue Shield Texas |
| C3S | Anthem BCBS Virginia |
| C3T | Regence Blue Cross Blue Shield Oregon |
| C3U | Anthem BCBS Wisconsin |
| C3V | Blue Cross Blue Shield Illinois |
| C3W | Regence Blue Cross Blue Shield Oregon |
| C3X | Anthem BCBS Wisconsin |
| C3Y | Empire Blue Cross Blue Shield |
| C3Z | Empire Blue Cross Blue Shield |
| C4A | Premera Blue Cross |
| C4B | Anthem BCBS Virginia |
| C4C | Blue Cross Blue Shield Texas |
| C4D | Empire Blue Cross Blue Shield |
| C4F | Anthem BCBS Virginia |
| C4G | Anthem BCBS New Hampshire |
| C4H | Regence Blue Shield Washington |
| C4L | Blue Cross Blue Shield Texas |
| C4M | Empire Blue Cross Blue Shield |
| C4N | Independence Blue Cross |
| C4P | Blue Cross Blue Shield Texas |
| C4R | Premera Blue Cross |
| C4T | Anthem BCBS Ohio |
| C4U | Blue Cross Blue Shield Oklahoma |
| C4V | Anthem BCBS Georgia |
| C4W | BCBS Western New York |
| C5A | Anthem Blue Cross California |
| C5B | Blue Cross Blue Shield Illinois |
| C5C | Blue Cross Blue Shield Arkansas |
| C5D | Blue Cross Blue Shield Illinois |
| C5G | Anthem Blue Cross California |
| C5H | Anthem Blue Cross California |
| C5J | Anthem Blue Cross California |
| C5K | Blue Shield Northeastern New York |
| C5L | Blue Cross Blue Shield Illinois |
| C5M | Anthem BCBS Georgia |
| C5R | Anthem BCBS Connecticut |
| C5S | Anthem BCBS Colorado |
| C5T | Anthem BCBS Missouri |
| C5U | Anthem BCBS Colorado |
| C5W | Anthem BCBS Georgia |
| C5Z | BCBS Western New York |
| C6A | Anthem Blue Cross California |
| C6B | Anthem BCBS New Hampshire |
| C6C | Anthem BCBS Virginia |
| C6D | Anthem BCBS New Hampshire |
| C6E | Anthem BCBS New Hampshire |
| C6F | Blue Cross Blue Shield Illinois |
| C6G | Anthem BCBS New Hampshire |
| C6H | Anthem BCBS Virginia |
| C6J | Blue Cross Blue Shield Illinois |
| C6L | Horizon Blue Cross Blue Shield New Jersey |
| C6P | Regence Blue Cross Blue Shield Oregon |
| C6R | Empire Blue Cross Blue Shield |
| C6S | Anthem BCBS Virginia |
| C6T | Regence Blue Cross Blue Shield Oregon |
| C6W | Anthem BCBS Georgia |
| C7A | Anthem Blue Cross California |
| C7B | Blue Cross Blue Shield Illinois |
| C7C | Blue Cross Blue Shield Minnesota |
| C7D | Blue Cross Blue Shield Illinois |
| C7E | Anthem BCBS Colorado |
| C7F | Blue Cross Blue Shield Illinois |
| C7M | Anthem BCBS Wisconsin |
| C7N | Anthem BCBS Wisconsin |
| C7S | Blue Cross Blue Shield Minnesota |
| C7T | Anthem BCBS Ohio |
| C7W | Anthem BCBS Colorado |
| C7X | Anthem BCBS Colorado |
| C7Y | Regence Blue Shield Washington |
| C8A | Anthem Blue Cross California |
| C8B | Blue Cross Blue Shield Illinois |
| C8C | Anthem BCBS Missouri |
| C8D | Anthem BCBS Missouri |
| C8F | Blue Cross Blue Shield Massachusetts |
| C8M | Blue Cross Blue Shield Illinois |
| C8S | Blue Cross Blue Shield Minnesota |
| C8T | Anthem BCBS Nevada |
| C8V | Anthem Blue Cross California |
| C8W | Blue Cross Blue Shield Massachusetts |
| C9A | BCBS Western New York |
| C9B | Blue Cross Blue Shield Illinois |
| C9C | Anthem BCBS Connecticut |
| C9D | Regence Blue Shield Washington |
| C9E | Anthem Blue Cross California |
| C9H | Blue Cross Blue Shield Illinois |
| C9R | Blue Cross Blue Shield Texas |
| C9S | Premera Blue Cross |
| CAA | Carefirst BCBS Maryland |
| CAB | BCBS Massachusetts |
| CAC | Anthem Blue Cross California |
| CAD | Blue Cross Blue Shield Massachusetts |
| CAE | Empire Blue Cross Blue Shield |
| CAF | BCBS Mississippi |
| CAG | Blue Shield California |
| CAH | Blue Cross Blue Shield Georgia |
| CAI | Anthem Blue Cross California |
| CAJ | Wellmark BCBS |
| CAK | Blue Shield California |
| CAL | BCBS Minnesota |
| CAM | Highmark BCBS |
| CAN | BCBS Illinois |
| CAO | Independence Blue Cross |
| CAP | BCBS Texas |
| CAQ | Premera Blue Cross |
| CAR | Wellmark BCBS |
| CAS | BCBS Texas |
| CAT | Independence Blue Cross |
| CAU | Carefirst BCBS |
| CAV | Premera Blue Cross |
| CAW | Blue Shield California |
| CAX | Anthem Blue Cross California |
| CAY | BCBS Massachusetts |
| CAZ | BCBS Minnesota |
| CBA | Anthem Blue Cross California |
| CBB | BCBS Texas |
| CBC | BCBS Massachusetts |
| CBD | Highmark BCBS |
| CBE | Independence Blue Cross |
| CBF | Anthem BCBS Ohio |
| CBG | BCBS Alabama |
| CBH | Anthem BCBS Colorado |
| CBI | Anthem BCBS Ohio |
| CBJ | BCBS South Carolina |
| CBK | Anthem BCBS Ohio |
| CBL | Not Assigned Prefix |
| CBM | Wellmark BCBS |
| CBN | Blue Cross Blue Shield Georgia |
| CBO | BCBS South Carolina |
| CBP | Anthem BCBS Ohio |
| CBQ | Anthem Blue Cross California |
| CBR | BCBS Wisconsin |
| CBS | Anthem BCBS New Hampshire |
| CBT | Anthem BCBS Ohio |
| CBU | Horizon BCBS New Jersey |
| CBV | BCBS South Carolina |
| CBW | Anthem BCBS Colorado |
| CBX | Anthem BCBS Ohio |
| CBY | BCBS Illinois |
| CBZ | Horizon BCBS New Jersey |
| CCA | BCBS Illinois |
| CCB | Carefirst BCBS Maryland |
| CCC | Blue Cross Idaho |
| CCD | Blue Cross Blue Shield South Carolina |
| CCE | Not Assigned Prefix |
| CCF | BCBS Illinois |
| CCG | Not Assigned Prefix |
| CCH | Wellmark BCBS |
| CCI | BCBS Michigan |
| CCJ | BCBS Michigan |
| CCK | BCBS Minnesota |
| CCL | BCBS Illinois |
| CCM | BCBS Texas |
| CCN | BCBS Alabama |
| CCO | Independence Administrators |
| CCP | BCBS Michigan |
| CCQ | Independence Blue Cross |
| CCR | Wellmark BCBS |
| CCS | Not Assigned Prefix |
| CCT | Blue Cross Idaho |
| CCU | Anthem BCBS Connecticut – Taft Hartley National Account |
| CCV | Anthem Blue Cross California |
| CCW | Carefirst BCBS |
| CCX | BCBS Minnesota |
| CCY | Wellmark BCBS |
| CCZ | Blue Shield California |
| CDA | BCBS Illinois |
| CDB | Anthem Blue Cross California |
| CDC | BCBS Arizona |
| CDD | Carefirst Administrators |
| CDE | BCBS Texas |
| CDF | Anthem BCBS Kentucky |
| CDG | Wellmark BCBS |
| CDH | Not Assigned Prefix |
| CDI | CareFirst BCBS |
| CDJ | Anthem BCBS Indiana |
| CDK | Empire BCBS New York |
| CDL | Carefirst BCBS Maryland |
| CDM | Highmark BCBS |
| CDN | Blue Advantage Administrators Arkansas |
| CDO | Wellmark BCBS |
| CDP | Wellmark BCBS |
| CDQ | Independence Blue Cross |
| CDR | Carefirst BCBS Maryland |
| CDS | Blue Shield Northeastern New York |
| CDT | BCBS Minnesota |
| CDU | BCBS Illinois |
| CDV | BCBS South Carolina |
| CDW | BCBS Massachusetts |
| CDX | BCBS Illinois |
| CDY | Carefirst Administrators |
| CDZ | Independence Blue Cross |
| CEA | Anthem BCBS Virginia |
| CEB | Wellmark BCBS |
| CEC | BCBS Minnesota |
| CED | BCBS Illinois |
| CEE | BCBS Texas |
| CEF | Anthem BCBS Ohio |
| CEG | Carefirst BCBS Maryland |
| CEH | Blue Cross Blue Shield Massachusetts |
| CEI | CareFirst BCBS |
| CEJ | BCBS Illinois |
| CEK | Regence Blue Cross Blue Shield Utah |
| CEL | BCBS Massachusetts |
| CEM | Anthem Blue Cross California |
| CEN | Not Assigned Prefix |
| CEO | BCBS Nebraska |
| CEP | BCBS Illinois |
| CEQ | Wellmark BCBS |
| CER | Not Assigned Prefix |
| CES | BCBS South Carolina |
| CET | Blue Shield California |
| CEU | BCBS Alabama |
| CEV | BCBS Minnesota |
| CEW | Wellmark BCBS |
| CEX | BCBS Illinois |
| CEY | BCBS Illinois |
| CEZ | BCBS Illinois |
| CFA | Independence Blue Cross |
| CFB | Wellmark BCBS |
| CFC | Anthem BCBS Georgia |
| CFD | Anthem BCBS Ohio |
| CFE | BCBS South Carolina |
| CFF | Highmark BCBS |
| CFG | Not Assigned Prefix |
| CFH | Anthem Blue Cross California |
| CFI | Carefirst BCBS Maryland |
| CFJ | Wellmark BCBS |
| CFK | Wellmark BCBS |
| CFL | BCBS South Carolina |
| CFM | BCBS Massachusetts |
| CFN | BCBS Massachusetts |
| CFO | Carefirst BCBS Maryland |
| CFP | Anthem Blue Cross California |
| CFQ | Blue Cross Idaho |
| CFR | BCBS Illinois |
| CFS | Horizon Blue Cross Blue Shield New Jersey |
| CFT | Empire Blue Cross Blue Shield |
| CFU | CareFirst BCBS |
| CFV | Wellmark BCBS |
| CFW | BCBS Massachusetts |
| CFX | Premera Blue Cross |
| CFY | Anthem BCBS Ohio |
| CFZ | Anthem BCBS Ohio |
| CGA | Anthem Blue Cross California |
| CGB | BCBS Texas |
| CGC | BCBS South Carolina |
| CGD | Blue Shield California |
| CGE | BCBS Texas |
| CGF | BCBS Arizona |
| CGG | Anthem BCBS Kentucky |
| CGH | Anthem BCBS Missouri |
| CGI | Wellmark BCBS |
| CGJ | BCBS Massachusetts |
| CGK | Carefirst BCBS Maryland |
| CGL | BCBS Minnesota |
| CGM | Carefirst Administrators |
| CGN | BCBS Nebraska |
| CGO | BCBS Illinois |
| CGP | Excellus BCBS New York |
| CGQ | BCBS North Carolina |
| CGR | Carefirst BCBS Maryland |
| CGS | Anthem BCBS Missouri |
| CGT | Not Assigned Prefix |
| CGU | Not Assigned Prefix |
| CGV | Carefirst BCBS Maryland |
| CGW | BCBS Minnesota |
| CGX | Anthem BCBS Missouri |
| CGY | BCBS Florida |
| CGZ | Anthem BCBS Ohio |
| CHA | BCBS Alabama |
| CHB | BCBS Massachusetts |
| CHC | Carefirst BCBS |
| CHD | Highmark BCBS Pennsylvania |
| CHE | BCBS Nebraska |
| CHF | BCBS Texas |
| CHG | BCBS Illinois |
| CHH | BCBS Tennessee |
| CHI | Not Assigned Prefix |
| CHJ | Not Assigned Prefix |
| CHK | Wellmark BCBS |
| CHL | Anthem BCBS Ohio |
| CHM | Blue Cross Blue Shield Nebraska |
| CHN | Not Assigned Prefix |
| CHO | BCBS South Carolina |
| CHP | Capital Blue Cross |
| CHQ | Anthem Blue Cross California |
| CHR | BCBS Illinois |
| CHS | BCBS North Carolina |
| CHT | BCBS Tennessee |
| CHU | Carefirst BCBS Maryland |
| CHV | BCBS Illinois |
| CHW | BCBS South Carolina |
| CHX | Not Assigned Prefix |
| CHY | BCBS South Carolina |
| CHZ | BCBS Minnesota |
| CIA | Carefirst Administrators |
| CIB | BCBS Illinois |
| CIC | Carefirst BCBS Maryland |
| CID | BCBS North Carolina |
| CIE | Wellmark BCBS |
| CIF | BCBS Illinois |
| CIG | Not Assigned Prefix |
| CIH | Carefirst BCBS Maryland |
| CII | Anthem Blue Cross California |
| CIJ | Blue Cross Idaho |
| CIK | Capital Blue Cross |
| CIL | BCBS South Carolina |
| CIM | Blue Shield California |
| CIN | Carefirst BCBS |
| CIO | Capital Blue Cross |
| CIP | BCBS Alabama |
| CIQ | BCBS Tennessee |
| CIR | Premera Blue Cross |
| CIS | Regence Blue Shield Washington |
| CIT | Blue Cross Blue Shield South Carolina |
| CIU | Anthem BCBS Virginia |
| CIV | Capital Blue Cross |
| CIW | Anthem BCBS Ohio |
| CIX | Anthem BCBS Missouri |
| CIY | BCBS South Carolina |
| CIZ | CareFirst BCBS |
| CJA | Independence Blue Cross |
| CJB | BCBS Illinois |
| CJC | BCBS Nebraska |
| CJD | Anthem Blue Cross California |
| CJE | Empire BCBS New York |
| CJF | BCBS Nebraska |
| CJG | BCBS Kansas City |
| CJH | BCBS North Carolina |
| CJI | Highmark BCBS West Virginia |
| CJJ | Premera Blue Cross Washington |
| CJK | BCBS Massachusetts |
| CJL | Empire BCBS New York |
| CJM | BCBS Florida |
| CJN | BCBS Florida |
| CJO | Anthem BCBS Ohio |
| CJP | Horizon BCBS New Jersey |
| CJQ | Blue Cross Idaho |
| CJR | Anthem BCBS Wisconsin |
| CJS | BCBS Illinois |
| CJT | BCBS Texas |
| CJU | BCBS Illinois |
| CJV | Empire BCBS New York |
| CJW | Regence Blue Cross Blue Shield Oregon |
| CJX | Anthem BCBS Ohio |
| CJY | Anthem BCBS Ohio |
| CJZ | Wellmark BCBS |
| CKA | CareFirst BCBS |
| CKB | Anthem BCBS Ohio |
| CKC | Anthem BCBS Connecticut |
| CKD | BCBS North Carolina |
| CKE | BCBS Western New York |
| CKF | Blue Cross Idaho |
| CKG | BCBS Tennessee |
| CKH | Anthem BCBS Indiana |
| CKI | Anthem Blue Cross California |
| CKJ | Anthem BCBS Ohio |
| CKK | Highmark BCBS |
| CKL | Carefirst Administrators |
| CKM | Highmark BCBS |
| CKN | Regence Blue Cross Blue Shield Utah |
| CKO | BCBS Massachusetts |
| CKP | BCBS Texas |
| CKQ | Anthem BCBS Ohio |
| CKR | BCBS Tennessee |
| CKS | Anthem BCBS Missouri |
| CKT | Not Assigned Prefix |
| CKU | Anthem BCBS Ohio |
| CKV | Anthem BCBS Ohio |
| CKW | Anthem BCBS Ohio |
| CKX | Not Assigned Prefix |
| CKY | Blue Shield California |
| CKZ | Premera Blue Cross |
| CLA | BCBS Illinois |
| CLB | BCBS Illinois |
| CLC | BCBS South Carolina |
| CLD | Anthem BCBS Georgia |
| CLE | BCBS Texas |
| CLF | Anthem BCBS Georgia |
| CLG | Carefirst BCBS |
| CLH | Excellus BCBS New York |
| CLI | Wellmark BCBS |
| CLJ | Anthem BCBS Ohio |
| CLK | Empire BCBS New York |
| CLL | Anthem Blue Cross California |
| CLM | Wellmark BCBS |
| CLN | BCBS South Carolina |
| CLO | BCBS Mississippi |
| CLP | BCBS Illinois |
| CLQ | Anthem BCBS Virginia |
| CLR | Premera Blue Cross Washington |
| CLS | BCBS Massachusetts |
| CLT | Wellmark BCBS |
| CLU | Anthem BCBS Virginia |
| CLV | CareFirst BCBS |
| CLW | Anthem Blue Cross California |
| CLX | Premera Blue Cross |
| CLY | Wellmark BCBS |
| CLZ | Carefirst BCBS Maryland |
| CMA | BCBS Michigan |
| CMB | Anthem BCBS Virginia |
| CMC | Wellmark BCBS |
| CMD | BCBS Georgia |
| CME | BCBS Illinois |
| CMF | Wellmark BCBS |
| CMG | Wellmark BCBS |
| CMH | BCBS Tennessee |
| CMI | Independence Blue Cross |
| CMJ | Anthem BCBS Ohio |
| CMK | Anthem BCBS Ohio |
| CML | Not Assigned Prefix |
| CMM | BCBS Massachusetts |
| CMN | Blue Shield Northeastern New York |
| CMO | BCBS Arizona |
| CMP | BCBS Minnesota |
| CMQ | Regence BCBS Oregon |
| CMR | BCBS Illinois |
| CMS | BCBS Massachusetts |
| CMT | Not Assigned Prefix |
| CMU | Highmark BCBS Pennsylvania |
| CMV | Blue Shield California |
| CMW | Wellmark BCBS |
| CMX | Excellus BCBS New York |
| CMY | Blue Cross Idaho |
| CMZ | Anthem BCBS Ohio |
| CNA | Premera Blue Cross |
| CNB | Anthem BCBS Ohio |
| CNC | BCBS Illinois |
| CND | BCBS Minnesota |
| CNE | Wellmark BCBS |
| CNF | Wellmark BCBS |
| CNG | Highmark BCBS |
| CNH | Anthem BCBS Ohio |
| CNI | BCBS Texas |
| CNJ | BCBS South Carolina |
| CNK | Wellmark BCBS |
| CNL | BCBS Illinois |
| CNM | Highmark BCBS |
| CNN | Highmark BCBS |
| CNO | Anthem Blue Cross California |
| CNP | BCBS Western New York |
| CNQ | Anthem Blue Cross California |
| CNR | Carefirst BCBS |
| CNS | Not Assigned Prefix |
| CNT | BCBS Illinois |
| CNU | Carefirst BCBS |
| CNV | BCBS Illinois |
| CNW | Carefirst BCBS |
| CNX | BCBS Minnesota |
| CNY | Anthem BCBS Virginia |
| CNZ | BCBS Illinois |
| COA | Capital Blue Cross |
| COB | BCBS Texas |
| COC | Carefirst BCBS Maryland |
| COD | Anthem BCBS Ohio |
| COE | Anthem Blue Cross California |
| COF | Not Assigned Prefix |
| COG | Anthem BCBS Colorado |
| COH | Empire BCBS New York |
| COI | Not Assigned Prefix |
| COJ | BCBS Alabama |
| COL | Highmark BCBS |
| COM | BCBS Alabama |
| CON | BCBS Massachusetts |
| COO | BCBS Minnesota |
| COP | BCBS Alabama |
| COQ | Independence Blue Cross |
| COR | Blue Shield California |
| COS | Independence Blue Cross |
| COT | Blue Cross Idaho |
| COU | BCBS Texas |
| COV | BCBS Arizona |
| COW | Highmark BCBS |
| COX | Blue Shield California |
| COY | Capital Blue Cross |
| COZ | Highmark BCBS |
| CPA | BCBS Minnesota |
| CPB | Carefirst Administrators |
| CPC | BCBS Alabama |
| CPD | BCBS Massachusetts |
| CPE | BCBS Illinois |
| CPF | BCBS South Carolina |
| CPG | Blue Shield Northeastern New York |
| CPH | BCBS Illinois |
| CPI | BCBS Minnesota |
| CPJ | Carefirst Administrators |
| CPK | Regence BCBS Washington |
| CPL | BCBS Kansas City |
| CPM | Carefirst BCBS |
| CPN | Carefirst BCBS |
| CPO | BCBS Texas |
| CPP | Wellmark BCBS |
| CPQ | Anthem Blue Cross California |
| CPR | Anthem Blue Cross California |
| CPS | BCBS Alabama |
| CPT | Anthem Blue Cross California |
| CPU | BCBS Nebraska |
| CPV | Anthem Blue Cross California |
| CPW | Wellmark BCBS |
| CPX | BCBS South Carolina |
| CPY | BCBS Illinois |
| CPZ | Blue Shield Northeastern New York |
| CQA | Independence Blue Cross |
| CQB | Anthem Blue Cross California |
| CQC | Not Assigned Prefix |
| CQD | BCBS South Carolina |
| CQE | BCBS Missouri |
| CQF | BCBS South Carolina |
| CQG | Anthem Blue Cross California |
| CQH | Regence BCBS Oregon |
| CQI | Carefirst BCBS Maryland |
| CQJ | BCBS Texas |
| CQK | Blue Shield California |
| CQL | Anthem Blue Cross California |
| CQM | Highmark BCBS |
| CQN | Blue Shield California |
| CQO | Carefirst BCBS Maryland |
| CQP | Carefirst BCBS Maryland |
| CQQ | Anthem BCBS Colorado |
| CQR | Anthem Blue Cross California |
| CQS | BCBS Western New York |
| CQT | Carefirst BCBS Maryland |
| CQU | Carefirst BCBS Maryland |
| CQV | Wellmark BCBS |
| CQW | BCBS Minnesota |
| CQX | Independence Blue Cross |
| CQY | Wellmark BCBS |
| CQZ | Blue Cross Idaho |
| CRA | Capital Blue Cross |
| CRB | BCBS Minnesota |
| CRC | Capital Blue Cross |
| CRD | BCBS Minnesota |
| CRE | Blue Shield California |
| CRF | BCBS South Carolina |
| CRG | BCBS Texas |
| CRH | BCBS Michigan |
| CRI | Anthem BCBS Ohio |
| CRJ | Premera Blue Cross |
| CRK | BCBS Texas |
| CRL | Excellus BCBS New York |
| CRM | BCBS Illinois |
| CRN | BCBS South Carolina |
| CRO | Anthem BCBS Virginia |
| CRP | BCBS Illinois |
| CRQ | Anthem BCBS Wisconsin |
| CRR | Anthem BCBS Ohio |
| CRS | Premera Blue Cross |
| CRT | BCBS Nebraska |
| CRU | BCBS Western New York |
| CRV | Not Assigned Prefix |
| CRW | BCBS Nebraska |
| CRX | BCBS North Carolina |
| CRY | BCBS Tennessee |
| CRZ | BCBS Texas |
| CSA | BCBS Alabama |
| CSB | BCBS Illinois |
| CSC | BCBS South Carolina |
| CSD | Carefirst BCBS Maryland |
| CSE | Not Assigned Prefix |
| CSF | Anthem BCBS Colorado |
| CSG | Anthem BCBS Georgia |
| CSH | Anthem BCBS Georgia |
| CSI | BCBS Kansas City |
| CSJ | Anthem BCBS Missouri |
| CSK | Wellmark BCBS |
| CSL | Horizon BCBS New Jersey |
| CSM | BCBS Arkansas Blue Advantage |
| CSN | Independence Blue Cross |
| CSO | Carefirst BCBS Maryland |
| CSP | Excellus BCBS New York |
| CSQ | Anthem BCBS Missouri |
| CSR | Blue Shield California |
| CSS | Anthem BCBS Colorado |
| CST | Anthem BCBS Colorado |
| CSU | Regence BCBS Utah |
| CSV | Anthem BCBS Virginia |
| CSW | BCBS Nebraska |
| CSX | Wellmark BCBS |
| CSY | Anthem Blue Cross California |
| CSZ | BCBS South Carolina |
| CT2 | Assigned |
| CT5 | Assigned |
| CTA | BCBS Massachusetts |
| CTB | BCBS South Carolina |
| CTC | BCBS Oklahoma |
| CTD | Anthem BCBS Georgia |
| CTE | Blue Cross Idaho |
| CTF | BCBS Minnesota |
| CTG | Not Assigned Prefix |
| CTH | BCBS South Carolina |
| CTI | BCBS Massachusetts |
| CTJ | Anthem BCBS Indiana |
| CTK | Capital Blue Cross |
| CTL | BCBS Illinois |
| CTM | Blue Cross Idaho |
| CTN | Anthem BCBS Connecticut |
| CTO | Blue Shield California |
| CTP | Anthem BCBS Connecticut |
| CTQ | BCBS Western New York |
| CTR | Anthem BCBS Indiana |
| CTS | BCBS Nebraska |
| CTT | Premera Blue Cross |
| CTU | Blue Shield California |
| CTV | BCBS Massachusetts |
| CTW | Premera Blue Cross Washington |
| CTX | Blue Shield California |
| CTY | BCBS Illinois |
| CTZ | BCBS Arizona |
| CUA | Not Assigned Prefix |
| CUB | Excellus BCBS New York |
| CUC | BCBS Illinois |
| CUD | BCBS Massachusetts |
| CUE | Not Assigned Prefix |
| CUF | Blue Shield California |
| CUG | Wellmark BCBS |
| CUH | Anthem BCBS Colorado |
| CUI | Independence Blue Cross |
| CUJ | BCBS South Carolina |
| CUK | BCBS Alabama |
| CUL | Blue Shield California |
| CUN | Highmark BCBS |
| CUO | Independence Blue Cross |
| CUP | Wellmark BCBS |
| CUQ | Blue Shield California |
| CUR | BCBS Western New York |
| CUS | Independence Blue Cross |
| CUT | BCBS Illinois |
| CUU | BCBS Texas |
| CUV | BCBS Illinois |
| CUW | Wellmark BCBS |
| CUX | Regence Blue Shield Idaho |
| CUY | Regence Blue Shield Washington |
| CUZ | Anthem BCBS Ohio |
| CVA | Anthem BCBS Ohio |
| CVB | BCBS Florida |
| CVC | BCBS Illinois |
| CVD | Carefirst Administrators |
| CVE | Anthem BCBS Ohio |
| CVF | Anthem BCBS Ohio |
| CVG | Anthem BCBS Ohio |
| CVH | Not Assigned Prefix |
| CVI | BCBS Alabama |
| CVJ | BCBS Florida |
| CVK | BCBS Florida |
| CVL | Regence BCBS Oregon |
| CVM | Anthem BCBS Wisconsin |
| CVN | Anthem BCBS Wisconsin |
| CVO | Anthem BCBS Virginia |
| CVP | Anthem BCBS Ohio |
| CVQ | Anthem BCBS Ohio |
| CVR | Anthem BCBS Ohio |
| CVS | Wellmark BCBS |
| CVT | Carefirst BCBS Maryland |
| CVU | Anthem BCBS Virginia |
| CVV | Carefirst BCBS Maryland |
| CVW | Blue Shield California |
| CVX | BCBS Illinois |
| CVY | Anthem BCBS Ohio |
| CVZ | Wellmark BCBS |
| CWA | Carefirst BCBS Maryland |
| CWB | Anthem BCBS Ohio |
| CWC | Not Assigned Prefix |
| CWD | Wellmark BCBS |
| CWE | BCBS Michigan |
| CWF | Blue Cross Idaho |
| CWG | Anthem BCBS Ohio |
| CWH | Anthem BCBS Missouri |
| CWI | Blue Shield California |
| CWJ | BCBS Alabama |
| CWK | BCBS Massachusetts |
| CWL | BCBS Illinois |
| CWM | Highmark BCBS |
| CWN | Carefirst BCBS Maryland |
| CWO | BCBS Massachusetts |
| CWP | BCBS Texas |
| CWQ | Anthem BCBS Ohio |
| CWR | Anthem BCBS Georgia |
| CWS | BCBS Texas |
| CWT | BCBS Texas |
| CWU | Carefirst Administrators |
| CWV | Carefirst Administrators |
| CWW | Wellmark BCBS |
| CWX | Anthem BCBS Wisconsin |
| CWY | Anthem BCBS Missouri |
| CWZ | Empire BCBS New York |
| CXA | Premera Blue Cross |
| CXB | Carefirst BCBS Maryland |
| CXC | BCBS Rhose Island |
| CXD | BCBS Illinois |
| CXE | BCBS South Carolina |
| CXF | Premera Blue Cross |
| CXG | BCBS Massachusetts |
| CXH | BCBS Minnesota |
| CXI | BCBS Nebraska |
| CXJ | Excellus BCBS New York |
| CXK | BCBS Texas |
| CXL | Not Assigned Prefix |
| CXM | Highmark BCBS |
| CXN | BCBS South Carolina |
| CXO | BCBS Arkansas Blue Advantage |
| CXP | BCBS Texas |
| CXQ | Wellmark BCBS |
| CXR | Highmark BCBS |
| CXS | Anthem BCBS Georgia |
| CXT | BCBS Illinois |
| CXU | Not Assigned Prefix |
| CXV | Blue Shield California |
| CXW | BCBS South Carolina |
| CXX | Blue Shield California |
| CXY | Not Assigned Prefix |
| CXZ | Carefirst BCBS Maryland |
| CYA | BCBS Illinois |
| CYB | Blue Shield California |
| CYC | BCBS Illinois |
| CYD | BCBS Florida |
| CYE | Regence BCBS Utah |
| CYF | Carefirst BCBS |
| CYG | BCBS Florida |
| CYH | BCBS Georgia |
| CYI | BCBS Massachusetts |
| CYJ | Anthem BCBS Georgia |
| CYK | BCBS South Carolina |
| CYL | BCBS Illinois |
| CYM | Anthem Blue Cross California |
| CYN | Highmark BCBS |
| CYO | BCBS Massachusetts |
| CYP | BCBS Illinois |
| CYQ | BCBS Illinois |
| CYR | BCBS Illinois |
| CYS | BCBS Illinois |
| CYT | Anthem BCBS Georgia |
| CYU | Empire BCBS New York |
| CYV | Regence BCBS Washington |
| CYW | Not Assigned Prefix |
| CYX | BCBS Tennessee |
| CYY | BCBS South Carolina |
| CYZ | Regence BCBS Washington |
| CZA | Anthem BCBS Kentucky |
| CZB | Anthem BCBS Kentucky |
| CZC | Anthem BCBS Connecticut |
| CZD | Not Assigned Prefix |
| CZE | BCBS Texas |
| CZF | Not Assigned Prefix |
| CZG | Carefirst Administrators |
| CZH | Anthem BCBS Connecticut |
| CZI | Blue Shield California |
| CZJ | Premera Blue Cross |
| CZK | Anthem BCBS Virginia |
| CZL | Not Assigned Prefix |
| CZM | Not Assigned Prefix |
| CZN | Independence Blue Cross |
| CZO | Carefirst BCBS |
| CZP | Anthem BCBS Ohio |
| CZQ | Anthem BCBS Ohio |
| CZR | Wellmark BCBS |
| CZS | Independence Blue Cross |
| CZT | Anthem BCBS Connecticut |
| CZU | Anthem Blue Cross California |
| CZV | Independence Blue Cross |
| CZW | BCBS Minnesota |
| CZX | Not Assigned Prefix |
| CZY | BCBS North Carolina |
| CZZ | Highmark BCBS |
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