| SAV SAZ SBG SBJ SBL SBM SBO SBZ SDI SDM SDZ SEF SEQ SEX SFD SFE SGD SGK SGQ SHJ SHU SHV SHY SIE SIK SIP SIQ SIS SIX SJJ SJM SJQ SJV SJW SKC SKE SKM SKR SKV SKZ SLD SLJ SLO SLP SLQ SLV SLY SLZ SMI SMO SMQ SMR SNC SND SNF SNG SNH SNI SNM SNN SNR SNT SNW SOG SOH SOI SOM SOT SOV SOY SOZ SPC SPM SPP SPV SPY SPZ SQA SQB SQF SQI SQL SSB SSH SSJ SSN SSP SSR SSV SSW STO SUK SUO SUQ SVA SVI SVJ SVM SVV SVW SVZ SWA SWC SWE SWF SWL SWM SWN SWO SWQ SXF SXG SXH SXL SXP SXR SXS SXU SYL SYN SYV SYW SZG SZP SZT SZV SZW | Alpha Prefix not assigned or unallocated |
| SLE SQJ | Anthem Blue-Cross Blue-Shield of Colorado |
| SDN SHP SJG | Anthem Blue-Cross Blue-Shield of Connecticut |
| SBI SBS SHL SIJ SJN SKG SKI SKW SPA SQD SQS SQV SRN SRR SRX SSM STH SUJ SVR SVS SWI SYP SZI | Anthem Blue-Cross Blue-Shield of Georgia |
| SBA SEN SMD SQH STF STR STY | Anthem Blue-Cross Blue-Shield of Indiana |
| SEG SGF SOR SWP | Anthem Blue-Cross Blue-Shield of Kentucky |
| SBB SFX SHA SHF SNU SOU SRB SRM SRV SRZ SSF | Anthem Blue-Cross Blue-Shield of Missouri |
| SAB SAI SBT SCN SDV SFK SGY SHB SIT SIY SJA SJB SJE SJF SJH SKQ SMB SMM SMP SOF SPD SQC SQG SQX SQZ SRK STB SUI SWG SWU SXC SXE SXI SXQ SYA SYC SZQ SZS SZU | Anthem Blue-Cross Blue-Shield of Ohio |
| SAE SAN SCF SCT SDC SEM SER SFV SHW SMF SMT SPK SPR SQT SZH | Anthem Blue-Cross Blue-Shield of Virginia |
| SKF SRT SWV SYS | Anthem Blue-Cross Blue-Shield of Wisconsin |
| SAC SAF SAG SBV SDG SDU SEY SGE SGV SHC SHO SIF SIR SJO SLG SNA SNX SPI SQK SRQ SSU SSY SUT SXJ SXZ SZY | Anthem Bluecross of California |
| SFT SIM SJK SXA | Arkansas Blue-Cross Blue-Shield |
| SCG SCO SCW SCY SDT SEH SFM SHK SJT SLI SMH SMY STC SUM SUV SYF SYX | Blue-Cross Blue-Shield of Alabama |
| SNK SPH SWB SWT SYD | Blue-Cross Blue-Shield of Arizona |
| SAH SAK SBC SBF SBQ SCE SCX SDO SED SFB SFI SFP SFZ SGG SGW SHN SIU SIW SJL SJP SKK SKL SKS SKY SML SMW SNL SNS SOE SPL SPQ SRY STX SUN SUP SUR SVU SWH SWJ SWK SXW SXX SYB SYY SZC SZE SZF | Blue-Cross Blue-Shield of Illinois |
| SVL | Blue-Cross Blue-Shield of Kansas |
| SBY SHH SLB SPE SVD SVG | Blue-Cross Blue-Shield of Kansas City |
| SGN SHX SJI SLC SLM SRE | Blue-Cross Blue-Shield of Louisiana |
| SBE SBW SBX SFO SGO SGR SGT SHR SIG SJU SLT SOP SPS SRW SST SUG SWD SWS SXY SYU SZD | Blue-Cross Blue-Shield of Massachusetts |
| SAR SCR SEB SEE SES SGB SGC SGM SMK SMU SMV SMX SNV SOB SQO SVB SXO SYO SYQ | Blue-Cross Blue-Shield of Michigan |
| SAQ SCH SCJ SDJ SDX SKA SKP SLK SLN SMC SNE SNP SNZ SPT SQE SQR SSE SSI SUA SVH SVT SVY SWY SYG SYH | Blue-Cross Blue-Shield of Minnesota |
| SFQ SVK | Blue-Cross Blue-Shield of Mississippi |
| SDA SKT SMA SOX SZN | Blue-Cross Blue-Shield of Nebraska |
| SAD SEV SIO SKU SOL SRF SSC SUH SVN | Blue-Cross Blue-Shield of North Carolina |
| SHZ | Blue-Cross Blue-Shield of North Dakota |
| SDW SVQ | Blue-Cross Blue-Shield of Oklahoma |
| SNQ | Blue-Cross Blue-Shield of Rhode Island |
| SAL SAU SBD SCB SCZ SDB SDK SDL SEK SFR SGA SGS SIB SJS SJX SLA SMZ SNO SPJ SQU SQY SRC SRP SRS STK SUU SYE | Blue-Cross Blue-Shield of South Carolina |
| SEW SFF SFS SPB STA STG STL STQ STT STV SVE SYT | Blue-Cross Blue-Shield of Tennessee |
| SBP SCD SCM SET SHT SKN SKX SLR SNB SPN SSX STI STP | Blue-Cross Blue-Shield of Texas |
| SLW SPO SRL SUW | Blue-Cross Blue-Shield of Western New York |
| SCU SGJ SPX SQQ SSQ SXV | Bluecross of Idaho |
| SAJ SAP SCC SEO SFG SIC SIL SIV SJY SOC SOK SON SOO SPG SPW SQM SRG SSD SSL SSO STS SVO SVX SXD SXM | Blueshield of California |
| SDD SZO | Blueshield of Northeastern New York |
| SAS SCS SEP SHG SLU SLX SRH STD SUE SVF | Capital Bluecross of Pennsylvania |
| SAM SAY SBK SBN SGP SHS SJD SJR SPU SSA STW SVP SXT SYM SZL | Carefirst Blue-Cross Blue-Shield(Maryland/District of Columbia/Northern Virginia) |
| SCP SNY | Credence Blue-Cross Blue-Shield |
| SAX SDP SFA SFW SHD SHM SIH SME SMN SSK SUF SXK | Empire Blue-Cross Blue-Shield of New York |
| SDS SRO SUD SUS | Excellus Blue-Cross Blue-Shield of New York |
| SDY SEC SFL SGU SJC SLS SOS STZ | Florida Blue |
| SDE SLL SOD SZJ | Highmark Blue-Cross Blue-Shield of Delaware |
| SBH SBR SDR SEI SJZ SLF SRI STM STN SWR SWZ SYR SZM | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| SCV SDQ SGH SGX SGZ SMJ SNJ SQW SRA SRD SUB SUC SUX SUY SUZ | Horizon Blue-Cross Blue-Shield of New Jersey |
| SEJ SEZ SFU SFY SGI SHQ SII SIN SKB SKD SKH SKJ SOJ SOQ SOW SPF SWX SYI SZA SZZ | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| SBU SCL SEA SKO SLH SQN SRU SSZ SVC SYZ SZR SZX | Premera Blue-Cross Blue-Shield of Alaska |
| STJ | Premera Bluecross of Alaska |
| SAW SCA SCI SGL SID SOA SQP SRJ SSS SXN SYK SZB | Regence Blue-Cross Blue-Shield(Oregon/Idaho/Utah/Washington) |
| SAA SAO SAT SCK SCQ SDF SDH SEL SEU SFC SFH SFJ SFN SHE SHI SIA SIZ SMG SMS SSG STE STU SUL SWW SXB SYJ SZK | Wellmark Blue-Cross Blue-Shield of South Dakota/Iowa |