| Prefix | Plan Name | |
|---|---|---|
| S2A | BCBS of Western New York | |
| S2C | Blue Cross Blue Shield of Illinois | |
| S2D | Blue Cross Blue Shield of Texas | |
| S2E | Blue Cross Blue Shield of Illinois | |
| S2F | Blue Cross Blue Shield of Illinois | |
| S2G | Blue Cross Blue Shield of Texas | |
| S2H | Blue Cross Blue Shield of Alabama | |
| S2I | Anthem BCBS of Wisconsin | |
| S2K | Blue Cross Blue Shield of Texas | |
| S2L | Blue Cross Blue Shield of Illinois | |
| S2M | Regence Blue Cross Blue Shield of Oregon | |
| S2P | Blue Cross Blue Shield of Illinois | |
| S2Q | Blue Cross Blue Shield of Massachusetts | |
| S2R | Blue Cross Blue Shield of Illinois | |
| S2S | Independence Blue Cross FOC | |
| S2T | Blue Cross Blue Shield of Illinois | |
| S2V | Blue Cross Blue Shield of Illinois | |
| S2X | Blue Cross Blue Shield of Texas | |
| S2Y | Blue Cross Blue Shield of Illinois | |
| S2Z | Blue Cross Blue Shield of Texas | |
| S3A | Blue Shield of Northeastern New York | |
| S3B | Premera Blue Cross | |
| S3C | Independence Blue Cross FOC | |
| S3D | Blue Cross Blue Shield of Illinois | |
| S3E | Blue Cross Blue Shield of Illinois | |
| S3F | Blue Cross Blue Shield of Illinois | |
| S3G | Premera Blue Cross | |
| S3H | Blue Cross Blue Shield of Texas | |
| S3K | Blue Cross Blue Shield of Texas | |
| S3L | Blue Cross Blue Shield of Illinois | |
| S3M | Blue Cross Blue Shield of Illinois | |
| S3P | Blue Cross Blue Shield of Illinois | |
| S3Q | Anthem Blue Cross of California | |
| S3R | Highmark BCBS of Pennsylvania | |
| S3S | Independence Blue Cross FOC | |
| S3T | BCBS of Western New York | |
| S3U | Highmark BCBS of Pennsylvania | |
| S3Y | Blue Cross Blue Shield of Massachusetts | |
| S4A | Premera Blue Cross | |
| S4B | Premera Blue Cross | |
| S4C | Premera Blue Cross | |
| S4E | Premera Blue Cross | |
| S4F | Blue Cross Blue Shield of Illinois | |
| S4G | Blue Cross Blue Shield of Massachusetts | |
| S4H | Anthem BCBS of Missouri | |
| S4K | Independence Blue Cross FOC | |
| S4L | Blue Cross Blue Shield of Illinois | |
| S4M | Blue Cross Blue Shield of Illinois | |
| S4N | Blue Cross Blue Shield of Illinois | |
| S4P | Blue Cross Blue Shield of Illinois | |
| S4R | Empire Blue Cross Blue Shield | |
| S4U | Blue Cross Blue Shield of Texas | |
| S4V | Premera Blue Cross | |
| S4W | Regence Blue Cross Blue Shield of Oregon | |
| S5A | Blue Cross Blue Shield of Texas | |
| S5C | Blue Cross Blue Shield of Massachusetts | |
| S5E | Blue Cross Blue Shield of Texas | |
| S5G | Anthem BCBS of Indiana | |
| S5H | Anthem BCBS of Missouri | |
| S5L | Blue Cross Blue Shield of Illinois | |
| S5M | Blue Cross Blue Shield of Illinois | |
| S5P | Blue Cross Blue Shield of Minnesota | |
| S5T | Blue Cross Blue Shield of Illinois | |
| S5U | Blue Cross Blue Shield of Texas | |
| S5V | Capital BlueCross | |
| S6A | Blue Cross Blue Shield of Texas | |
| S6B | Blue Cross Blue Shield of Illinois | |
| S6E | Blue Cross Blue Shield of Texas | |
| S6H | Blue Cross Blue Shield of Minnesota | |
| S6K | Anthem BCBS of Ohio | |
| S6L | Blue Cross Blue Shield of Texas | |
| S6M | Anthem BCBS of Kentucky | |
| S6P | Regence Blue Shield of Washington | |
| S6Q | Empire Blue Cross Blue Shield | |
| S6U | Blue Cross Blue Shield of Texas | |
| S6W | Regence Blue Cross Blue Shield of Oregon | |
| S6Y | Blue Cross Blue Shield of Illinois | |
| S7A | Anthem BCBS of Missouri | |
| S7B | Anthem BCBS of Missouri | |
| S7C | Anthem BCBS of Missouri | |
| S7E | Regence Blue Shield of Washington | |
| S7G | Anthem BCBS of Virginia | |
| S7L | Regence Blue Cross Blue Shield of Oregon | |
| S7T | Blue Cross Blue Shield of Illinois | |
| S7U | Blue Cross Blue Shield of Texas | |
| S8A | Anthem BCBS of Ohio | |
| S8C | Empire Blue Cross Blue Shield | |
| S8K | Premera Blue Cross | |
| S8L | Blue Cross Blue Shield of Illinois | |
| S8N | Blue Cross Blue Shield of Minnesota | |
| S8T | Anthem BCBS of Missouri | |
| S8Y | Highmark BCBS of Pennsylvania | |
| S9B | Premera Blue Cross | |
| S9C | Blue Cross Blue Shield of Texas | |
| S9H | Regence Blue Shield of Washington | |
| S9J | Unassigned Prefix | |
| S9L | Regence Blue Cross Blue Shield of Oregon | |
| S9M | Blue Cross Blue Shield of Michigan | |
| S9R | Anthem BCBS of Ohio | |
| S9S | Independence Blue Cross FOC |
| S9T | Anthem BCBS of Kentucky | |
| SAA | Wellmark BCBS | |
| SAB | Anthem BCBS of Ohio | |
| SAC | Anthem Blue Cross of California | |
| SAD | BCBS of North Carolina | |
| SAE | Highmark BCBS | |
| SAF | Anthem Blue Cross of California | |
| SAG | Anthem Blue Cross of California | |
| SAH | BCBS of Illinois | |
| SAI | BCBS of Delaware | |
| SAJ | Empire BCBS of New York | |
| SAK | BCBS of Illinois | |
| SAL | BCBS of South Carolina | |
| SAM | Carefirst BCBS of Maryland | |
| SAN | BCBS of Georgia | |
| SAO | Wellmark BCBS | |
| SAP | Wellmark BCBS | |
| SAQ | BCBS of Minnesota | |
| SAR | BCBS of Michigan | |
| SAS | Unassigned Prefix | |
| SAT | Wellmark BCBS | |
| SAU | BCBS of South Carolina | |
| SAV | BCBS of Georgia | |
| SAW | Regence BCBS of Utah | |
| SAX | Empire BCBS of New York | |
| SAY | Carefirst BCBS | |
| SAZ | BCBS of North Carolina | |
| SBA | Anthem BCBS of Indiana | |
| SBB | Unassigned Prefix | |
| SBC | BCBS of Illinois | |
| SBD | BCBS of South Carolina | |
| SBE | BCBS of Massachusetts | |
| SBF | BCBS of Illinois | |
| SBG | BCBS of Alabama | |
| SBH | Highmark BCBS | |
| SBI | Anthem BCBS of Georgia | |
| SBJ | Regence BCBS of Washington | |
| SBK | Carefirst Administrators | |
| SBL | Unassigned Prefix | |
| SBM | Wellmark BCBS | |
| SBN | Carefirst Administrators | |
| SBO | BCBS of Florida | |
| SBP | BCBS of Illinois | |
| SBQ | BCBS of Illinois | |
| SBR | Highmark BCBS | |
| SBS | BCBS of Georgia | |
| SBT | Anthem BCBS of Ohio | |
| SBU | Premer BCBS of Alaska | |
| SBV | Anthem Blue Cross of California | |
| SBW | BCBS of Massachusetts | |
| SBX | BCBS of Massachusetts | |
| SBY | BCBS of South Carolina | |
| SBZ | Unassigned Prefix | |
| SCA | BCBS of Rhose Island | |
| SCB | BCBS of South Carolina | |
| SCC | Blue Shield of California | |
| SCD | BCBS of Texas | |
| SCE | BCBS of Illinois | |
| SCF | Carefirst BCBS of Maryland | |
| SCG | BCBS of Alabama | |
| SCH | BCBS of Minnesota | |
| SCI | Regence Blue Cross Blue Shield of Oregon | |
| SCJ | BCBS of Minnesota | |
| SCK | Wellmark BCBS | |
| SCL | Premera BCBS of Alaska | |
| SCM | BCBS of Texas | |
| SCN | Anthem BCBS of Ohio | |
| SCO | BCBS of Alabama | |
| SCP | BCBS of Arkansas | |
| SCQ | Wellmark BCBS | |
| SCR | BCBS of Michigan | |
| SCS | Capital BlueCross | |
| SCT | BCBS of Tennessee | |
| SCU | Blue Cross of Idaho | |
| SCV | Horizon BCBS of New Jersey | |
| SCW | BCBS of Alabama | |
| SCX | BCBS of Illinois | |
| SCY | BCBS of Alabama | |
| SCZ | BCBS of South Carolina | |
| SDA | BCBS of Nebraska | |
| SDB | BCBS of South Carolina | |
| SDC | Anthem BCBS of Virginia | |
| SDD | Blue Shield of Northeastern New York | |
| SDE | BCBS of Delaware | |
| SDF | Carefirst Administrators | |
| SDG | Anthem Blue Cross of California | |
| SDH | Wellmark BCBS | |
| SDI | Wellmark BCBS | |
| SDJ | BCBS of Minnesota | |
| SDK | BCBS of South Carolina | |
| SDL | Blue Cross of Idaho | |
| SDM | Unassigned Prefix | |
| SDN | Anthem BCBS of Connecticut | |
| SDO | BCBS of Illinois | |
| SDP | Empire BCBS of New York | |
| SDQ | BCBS of Florida | |
| SDR | Highmark BCBS | |
| SDS | Excellus BCBS of New York | |
| SDT | BCBS of Alabama | |
| SDU | Anthem Blue Cross of California |
| SDV | Anthem BCBS of Ohio | |
| SDW | BCBS of Nebraska | |
| SDX | BCBS of Minnesota | |
| SDY | BCBS of Florida | |
| SDZ | Unassigned Prefix | |
| SEA | Premera Blue Cross | |
| SEB | BCBS of Michigan | |
| SEC | BCBS of Florida | |
| SED | BCBS of Illinois | |
| SEE | BCBS of Michigan | |
| SEF | Blue Shield of California | |
| SEG | Anthem BCBS of Kentucky | |
| SEH | BCBS of Alabama | |
| SEI | Highmark BCBS | |
| SEJ | Independence Blue Cross | |
| SEK | BCBS of South Carolina | |
| SEL | Wellmark BCBS | |
| SEM | Anthem Blue Cross of California | |
| SEN | Anthem BCBS of Ohio | |
| SEO | Blue Shield of California | |
| SEP | Carefirst BCBS | |
| SEQ | BCBS of Georgia | |
| SER | BCBS of Texas | |
| SES | BCBS of Michigan | |
| SET | BCBS of Texas | |
| SEU | Wellmark BCBS | |
| SEV | BCBS of North Carolina | |
| SEW | BCBS of Tennessee | |
| SEX | Unassigned Prefix | |
| SEY | Anthem Blue Cross of California | |
| SEZ | Independence Blue Cross | |
| SFA | Empire BCBS of New York | |
| SFB | BCBS of Illinois | |
| SFC | Wellmark BCBS | |
| SFD | Unassigned Prefix | |
| SFE | Unassigned Prefix | |
| SFF | BCBS of Tennessee | |
| SFG | Anthem Blue Cross of California | |
| SFH | Wellmark BCBS | |
| SFI | BCBS of Illinois | |
| SFJ | Wellmark BCBS | |
| SFK | Premera Blue Cross | |
| SFL | BCBS of Florida | |
| SFM | BCBS of Alabama | |
| SFN | Wellmark BCBS | |
| SFO | BCBS of Massachusetts | |
| SFP | BCBS of Illinois | |
| SFQ | BCBS of Mississippi | |
| SFR | BCBS of South Carolina | |
| SFS | BCBS of Tennessee | |
| SFT | BCBS of Arkansas Blue Advantage | |
| SFU | Independence Blue Cross | |
| SFV | Anthem BCBS of Virginia | |
| SFW | Empire BCBS of New York | |
| SFX | Unassigned Prefix | |
| SFY | Carefirst BCBS of Maryland | |
| SFZ | BCBS of Illinois | |
| SGA | Anthem BCBS of Missouri | |
| SGB | BCBS of Michigan | |
| SGC | BCBS of Michigan | |
| SGD | BCBS of Georgia | |
| SGE | Anthem Blue Cross of California | |
| SGF | Unassigned Prefix | |
| SGG | BCBS of Illinois | |
| SGH | Horizon BCBS of New Jersey | |
| SGI | BCBS of Vermont | |
| SGJ | Blue Cross of Idaho | |
| SGK | Carefirst Administrators | |
| SGL | Regence BCBS | |
| SGM | BCBS of Michigan | |
| SGN | BCBS of Louisiana | |
| SGO | BCBS of Massachusetts | |
| SGP | Carefirst BCBS of Maryland | |
| SGQ | Unassigned Prefix | |
| SGR | BCBS of Massachusetts | |
| SGS | BCBS of Massachusetts | |
| SGT | BCBS of Massachusetts | |
| SGU | BCBS of South Carolina | |
| SGV | Anthem Blue Cross of California | |
| SGW | BCBS of Illinois | |
| SGX | Horizon BCBS of New Jersey | |
| SGY | Anthem BCBS of Ohio | |
| SGZ | Horizon BCBS of New Jersey | |
| SHA | Anthem BCBS of Missouri | |
| SHB | Anthem BCBS of Ohio | |
| SHC | Anthem Blue Cross of California | |
| SHD | Empire BCBS of New York | |
| SHE | Wellmark BCBS | |
| SHF | Regence Blue Cross Blue Shield of Utah | |
| SHG | Wellmark BCBS | |
| SHH | Unassigned Prefix | |
| SHI | Wellmark BCBS | |
| SHJ | Anthem BCBS of Virginia | |
| SHK | Carefirst BCBS of Maryland | |
| SHL | BCBS of South Carolina | |
| SHM | BCBS of Illinois | |
| SHN | BCBS of Illinois | |
| SHO | Anthem Blue Cross of California | |
| SHP | Anthem BCBS of Connecticut | |
| SHQ | Independence Blue Cross |
| SHR | BCBS of Massachusetts | |
| SHS | Carefirst Administrators | |
| SHT | BCBS of Texas | |
| SHU | Anthem BCBS of Ohio | |
| SHV | BCBS of North Dakota | |
| SHW | Anthem BCBS of Virginia | |
| SHX | BCBS of Alabama | |
| SHY | Anthem BCBS of Ohio | |
| SHZ | BCBS of North Dakota | |
| SIA | Wellmark BCBS | |
| SIB | BCBS of South Carolina | |
| SIC | Blue Shield of California | |
| SID | Regence BCBS | |
| SIE | Anthem BCBS of Virginia | |
| SIF | Anthem Blue Cross of California | |
| SIG | BCBS of Massachusetts | |
| SIH | Empire BCBS of New York | |
| SII | Independence Blue Cross | |
| SIJ | Anthem BCBS of Georgia | |
| SIK | Unassigned Prefix | |
| SIL | Blue Shield of California | |
| SIM | Highmark BCBS | |
| SIN | Independence Blue Cross | |
| SIO | BCBS of North Carolina | |
| SIP | BCBS of North Carolina | |
| SIQ | Unassigned Prefix | |
| SIR | Anthem Blue Cross of California | |
| SIS | Blue Shield of California | |
| SIT | Blue Shield of California | |
| SIU | BCBS of Illinois | |
| SIV | Blue Shield of California | |
| SIW | BCBS of Illinois | |
| SIX | Anthem BCBS of Virginia | |
| SIY | Anthem BCBS of Ohio | |
| SIZ | Wellmark BCBS | |
| SJA | Anthem BCBS of Ohio | |
| SJB | Anthem BCBS of Ohio | |
| SJC | BCBS of Florida | |
| SJD | Carefirst BCBS of Maryland | |
| SJE | Anthem BCBS of Ohio | |
| SJF | Anthem BCBS of Ohio | |
| SJG | Anthem BCBS of Connecticut | |
| SJH | BCBS of Rhose Island | |
| SJI | BCBS of Louisiana | |
| SJJ | Blue Shield of California | |
| SJK | BCBS of Arkansas Blue Advantage | |
| SJL | BCBS of Illinois | |
| SJM | BCBS of Georgia | |
| SJN | BCBS of Georgia | |
| SJO | Anthem Blue Cross of California | |
| SJP | BCBS of Illinois | |
| SJQ | Carefirst Administrators | |
| SJR | Carefirst BCBS of Maryland | |
| SJS | Carefirst Administrators | |
| SJT | BCBS of Alabama | |
| SJU | BCBS of Massachusetts | |
| SJV | Unassigned Prefix | |
| SJW | Unassigned Prefix | |
| SJX | BCBS of North Carolina | |
| SJY | Blue Shield of California | |
| SJZ | Highmark BCBS | |
| SKA | BCBS of Minnesota | |
| SKB | Independence Blue Cross | |
| SKC | Unassigned Prefix | |
| SKD | Independence Blue Cross | |
| SKE | Blue Shield of Northeastern New York | |
| SKF | Anthem BCBS of Wisconsin | |
| SKG | Anthem BCBS of Georgia | |
| SKH | Independence Blue Cross | |
| SKI | Anthem BCBS of Georgia | |
| SKJ | Independence Blue Cross | |
| SKK | BCBS of Illinois | |
| SKL | BCBS of Illinois | |
| SKM | Highmark BCBS | |
| SKN | BCBS of Texas | |
| SKO | Premera Blue Cross | |
| SKP | BCBS of Illinois | |
| SKQ | Anthem BCBS of Ohio | |
| SKR | BCBS of Illinois | |
| SKS | BCBS of Illinois | |
| SKT | BCBS of Nebraska | |
| SKU | BCBS of North Carolina | |
| SKV | Horizon BCBS of New Jersey | |
| SKW | BCBS of Texas | |
| SKX | BCBS of Texas | |
| SKY | BCBS of Illinois | |
| SKZ | Premera Blue Cross | |
| SLA | Anthem BCBS of Virginia | |
| SLB | BCBS of Kansas City | |
| SLC | BCBS of Illinois | |
| SLD | Excellus BCBS of New York | |
| SLE | Anthem BCBS of Colorado | |
| SLF | Highmark BCBS | |
| SLG | Anthem Blue Cross of California | |
| SLH | Premera Blue Cross | |
| SLI | BCBS of Alabama | |
| SLJ | Regence BCBS of Utah | |
| SLK | BCBS of Minnesota | |
| SLL | BCBS of Delaware | |
| SLM | Unassigned Prefix |
| SLN | BCBS of Minnesota | |
| SLO | Unassigned Prefix | |
| SLP | Wellmark BCBS | |
| SLQ | Horizon BCBS of New Jersey | |
| SLR | BCBS of Texas | |
| SLS | BCBS of South Carolina | |
| SLT | BCBS of Massachusetts | |
| SLU | BCBS of Western New York | |
| SLV | Unassigned Prefix | |
| SLW | BCBS of Western New York | |
| SLX | Capital Blue Cross | |
| SLY | BCBS of Nebraska | |
| SLZ | Regence Blue Shield of Washington | |
| SMA | BCBS of Nebraska | |
| SMB | Premera Blue Cross | |
| SMC | BCBS of Minnesota | |
| SMD | Anthem BCBS of Indiana | |
| SME | Empire BCBS of New York | |
| SMF | Anthem BCBS of Virginia | |
| SMG | Wellmark BCBS | |
| SMH | Unassigned Prefix | |
| SMI | BCBS of Delaware | |
| SMJ | Horizon BCBS of New Jersey | |
| SMK | BCBS of Michigan | |
| SML | BCBS of Illinois | |
| SMM | Anthem BCBS of Ohio | |
| SMN | Premera Blue Cross | |
| SMO | Anthem Blue Cross of California | |
| SMP | Anthem BCBS of Ohio | |
| SMQ | BCBS of Georgia | |
| SMR | Carefirst BCBS of Maryland | |
| SMS | Wellmark BCBS | |
| SMT | BCBS of Illinois | |
| SMU | BCBS of Michigan | |
| SMV | BCBS of Michigan | |
| SMW | BCBS of Illinois | |
| SMX | BCBS of Michigan | |
| SMY | Wellmark BCBS | |
| SMZ | BCBS of South Carolina | |
| SNA | Anthem Blue Cross of California | |
| SNB | BCBS of Texas | |
| SNC | Independence Blue Cross | |
| SND | Unassigned Prefix | |
| SNE | BCBS of Minnesota | |
| SNF | Empire BCBS of New York | |
| SNG | Unassigned Prefix | |
| SNH | Unassigned Prefix | |
| SNI | Regence Blue Shield of Washington | |
| SNJ | Horizon BCBS of New Jersey | |
| SNK | BCBS of Arizona | |
| SNL | BCBS of Illinois | |
| SNM | Anthem Blue Cross of California | |
| SNN | BCBS of Illinois | |
| SNO | BCBS of South Carolina | |
| SNP | BCBS of Minnesota | |
| SNQ | BCBS of Rhose Island | |
| SNR | BCBS of Illinois | |
| SNS | BCBS of Illinois | |
| SNT | Carefirst Administrators | |
| SNU | Anthem BCBS of Missouri | |
| SNV | BCBS of Michigan | |
| SNW | Wellmark BCBS | |
| SNX | Anthem Blue Cross of California | |
| SNY | Unassigned Prefix | |
| SNZ | BCBS of Minnesota | |
| SOA | Regence BCBS of Utah | |
| SOB | BCBS of Michigan | |
| SOC | Blue Shield of California | |
| SOD | BCBS of Delaware | |
| SOE | BCBS of Illinois | |
| SOF | Anthem BCBS of Ohio | |
| SOG | BCBS of South Carolina | |
| SOH | BCBS of Alabama | |
| SOI | BCBS of Nebraska | |
| SOJ | Independence Blue Cross | |
| SOK | Blue Shield of California | |
| SOL | Independence Blue Cross | |
| SOM | Anthem Blue Cross of California | |
| SON | Blue Shield of California | |
| SOO | Blue Shield of California | |
| SOP | BCBS of Massachusetts | |
| SOQ | Independence Blue Cross | |
| SOR | BCBS of South Carolina | |
| SOS | BCBS of Florida | |
| SOT | Unassigned Prefix | |
| SOU | BCBS of Massachusetts | |
| SOV | Horizon BCBS of New Jersey | |
| SOW | Independence Blue Cross | |
| SOX | BCBS of Nebraska | |
| SOY | Anthem Blue Cross of California | |
| SOZ | BCBS of South Carolina | |
| SPA | BCBS of Kansas | |
| SPB | BCBS of Tennessee | |
| SPC | BCBS of Minnesota | |
| SPD | Anthem BCBS of Ohio | |
| SPE | Anthem Blue Cross of California | |
| SPF | Independence Blue Cross | |
| SPG | Blue Shield of California | |
| SPH | BCBS of Arizona | |
| SPI | Anthem Blue Cross of California |
| SPJ | BCBS of South Carolina | |
| SPK | Anthem BCBS of Virginia | |
| SPL | BCBS of Illinois | |
| SPM | BCBS of South Carolina | |
| SPN | BCBS of Texas | |
| SPO | BCBS of Western New York | |
| SPP | BCBS of Minnesota | |
| SPQ | BCBS of Illinois | |
| SPR | Unassigned Prefix | |
| SPS | BCBS of Massachusetts | |
| SPT | BCBS of Minnesota | |
| SPU | Carefirst BCBS | |
| SPV | Carefirst Administrators | |
| SPW | BCBS of Illinois | |
| SPX | BCBS of Georgia | |
| SPY | Unassigned Prefix | |
| SPZ | Anthem Blue Cross of California | |
| SQA | Unassigned Prefix | |
| SQB | Unassigned Prefix | |
| SQC | Anthem BCBS of Ohio | |
| SQD | Anthem Blue Cross of California | |
| SQE | BCBS of Minnesota | |
| SQF | BCBS of Vermont | |
| SQG | Anthem BCBS of Ohio | |
| SQH | Anthem BCBS of Ohio | |
| SQI | Unassigned Prefix | |
| SQJ | Anthem BCBS of Colorado | |
| SQK | Anthem Blue Cross of California | |
| SQL | BCBS of Massachusetts | |
| SQM | Blue Shield of California | |
| SQN | Premera Blue Cross | |
| SQO | BCBS of Michigan | |
| SQP | Regence BCBS of Utah | |
| SQQ | Blue Cross of Idaho | |
| SQR | BCBS of Minnesota | |
| SQS | Anthem Blue Cross of California | |
| SQT | Anthem BCBS of Virginia | |
| SQU | BCBS of South Carolina | |
| SQV | BCBS of Georgia | |
| SQW | Horizon BCBS of New Jersey | |
| SQX | Anthem BCBS of Ohio | |
| SQY | BCBS of South Carolina | |
| SQZ | Anthem BCBS of Ohio | |
| SRA | Horizon BCBS of New Jersey | |
| SRB | Anthem BCBS of Missouri | |
| SRC | BCBS of South Carolina | |
| SRD | Horizon BCBS of New Jersey | |
| SRE | Unassigned Prefix | |
| SRF | Highmark BCBS | |
| SRG | Blue Shield of California | |
| SRH | Capital Blue Cross | |
| SRI | Blue Cross of Northeast Pennsylvania | |
| SRJ | Regence BCBS of Oregon | |
| SRK | BCBS of Massachusetts | |
| SRL | BCBS of Western New York | |
| SRM | Anthem BCBS of Missouri | |
| SRN | Anthem BCBS of Georgia | |
| SRO | Excellus BCBS of New York | |
| SRP | BCBS of South Carolina | |
| SRQ | Anthem Blue Cross of California | |
| SRR | BCBS of Georgia | |
| SRS | BCBS of South Carolina | |
| SRT | Anthem BCBS of Wisconsin | |
| SRU | Premera Blue Cross | |
| SRV | Anthem BCBS of Missouri | |
| SRW | BCBS of Massachusetts | |
| SRX | Anthem Blue Cross of California | |
| SRY | BCBS of Illinois | |
| SRZ | Anthem BCBS of Missouri | |
| SSA | Carefirst BCBS of Maryland | |
| SSB | Unassigned Prefix | |
| SSC | Regence BCBS of Idaho | |
| SSD | Blue Shield of California | |
| SSE | BCBS of Minnesota | |
| SSF | Anthem BCBS of Missouri | |
| SSG | Wellmark BCBS | |
| SSH | BCBS of Illinois | |
| SSI | BCBS of Minnesota | |
| SSJ | Anthem Blue Cross of California | |
| SSK | Empire BCBS of New York | |
| SSL | Unassigned Prefix | |
| SSM | Anthem Blue Cross of California | |
| SSN | Blue Shield of California | |
| SSO | BCBS of Arizona | |
| SSP | BCBS of Georgia | |
| SSQ | Blue Cross of Idaho | |
| SSR | Carefirst Administrators | |
| SSS | Regence BCBS of Utah | |
| SST | BCBS of Massachusetts | |
| SSU | Anthem Blue Cross of California | |
| SSV | Anthem BCBS of Ohio | |
| SSW | BCBS of Montana | |
| SSX | BCBS of Texas | |
| SSY | Anthem Blue Cross of California | |
| SSZ | Premera Blue Cross | |
| STA | BCBS of Tennessee | |
| STB | Premera Blue Cross | |
| STC | BCBS of Alabama | |
| STD | Capital Blue Cross | |
| STE | Wellmark BCBS |
| STF | Anthem BCBS of Indiana | |
| STG | BCBS of Tennessee | |
| STH | BCBS of Georgia | |
| STI | BCBS of Texas | |
| STJ | Premera Blue Cross | |
| STK | Unassigned Prefix | |
| STL | BCBS of Tennessee | |
| STM | Highmark BCBS | |
| STN | Highmark BCBS | |
| STO | BCBS of Massachusetts | |
| STP | BCBS of Texas | |
| STQ | BCBS of Tennessee | |
| STR | Anthem BCBS of Ohio | |
| STS | Capital Blue Shield of California | |
| STT | BCBS of Tennessee | |
| STU | Wellmark BCBS | |
| STV | BCBS of Tennessee | |
| STW | Carefirst BCBS | |
| STX | BCBS of Illinois | |
| STY | Anthem BCBS of Indiana | |
| STZ | BCBS of Florida | |
| SUA | BCBS of Minnesota | |
| SUB | Horizon BCBS of New Jersey | |
| SUC | Horizon BCBS of New Jersey | |
| SUD | Excellus BCBS of New York | |
| SUE | BCBS of Nebraska | |
| SUF | Empire BCBS of New York | |
| SUG | BCBS of Massachusetts | |
| SUH | BCBS of North Carolina | |
| SUI | Anthem BCBS of Ohio | |
| SUJ | Anthem BCBS of Georgia | |
| SUK | Wellmark BCBS | |
| SUL | Wellmark BCBS | |
| SUM | BCBS of Alabama | |
| SUN | Anthem BCBS of Iilinois | |
| SUO | BCBS of Alabama | |
| SUP | Anthem Blue Cross of California | |
| SUQ | Anthem Blue Cross of California | |
| SUR | BCBS of Illinois | |
| SUS | Excellus BCBS of New York | |
| SUT | Anthem Blue Cross of California | |
| SUU | BCBS of South Carolina | |
| SUV | BCBS of Alabama | |
| SUW | BCBS of Western New York | |
| SUX | Horizon BCBS of New Jersey | |
| SUY | Horizon BCBS of New Jersey | |
| SUZ | Horizon BCBS of New Jersey | |
| SVA | BCBS of Minnesota | |
| SVB | BCBS of Michigan | |
| SVC | Premera Blue Cross | |
| SVD | BCBS of Kansas City | |
| SVE | BCBS of Tennessee | |
| SVF | Blue Cross of Idaho | |
| SVG | BCBS of South Carolina | |
| SVH | BCBS of Minnesota | |
| SVI | Unassigned Prefix | |
| SVJ | Unassigned Prefix | |
| SVK | BCBS of Mississippi | |
| SVL | BCBS of South Carolina | |
| SVM | BCBS of Georgia | |
| SVN | BCBS of North Carolina | |
| SVO | Blue Shield of California | |
| SVP | Carefirst BCBS of Maryland | |
| SVQ | BCBS of Oklahoma | |
| SVR | Anthem BCBS of Georgia | |
| SVS | BCBS of Illinois | |
| SVT | BCBS of Minnesota | |
| SVU | BCBS of Illinois | |
| SVV | Capital Blue Cross | |
| SVW | Unassigned Prefix | |
| SVX | BCBS of Western New York | |
| SVY | BCBS of Minnesota | |
| SVZ | Anthem BCBS of Wisconsin | |
| SWA | Unassigned Prefix | |
| SWB | BCBS of Arizona | |
| SWC | Anthem BCBS of Virginia | |
| SWD | BCBS of Tennessee | |
| SWE | Blue Shield of Northeastern New York | |
| SWF | Blue Shield of California | |
| SWG | Anthem BCBS of Ohio | |
| SWH | BCBS of Illinois | |
| SWI | Anthem BCBS of Georgia | |
| SWJ | BCBS of Illinois | |
| SWK | BCBS of Illinois | |
| SWL | Unassigned Prefix | |
| SWM | Blue Shield of California | |
| SWN | Anthem Blue Cross of California | |
| SWO | Wellmark BCBS | |
| SWP | Blue Cross of Idaho | |
| SWQ | Wellmark BCBS | |
| SWR | Highmark BCBS | |
| SWS | BCBS of Massachusetts | |
| SWT | BCBS of Arizona | |
| SWU | BCBS of Illinois | |
| SWV | Anthem BCBS of Wisconsin | |
| SWW | Wellmark BCBS | |
| SWX | BCBS of North Carolina | |
| SWY | BCBS of Minnesota | |
| SWZ | Highmark BCBS | |
| SXA | BCBS of Oklahoma |
| SXB | Wellmark BCBS | |
| SXC | Anthem BCBS of Ohio | |
| SXD | Blue Shield of California | |
| SXE | Anthem BCBS of Ohio | |
| SXF | BCBS of Alabama | |
| SXG | Anthem Blue Cross of California | |
| SXH | Blue Shield of California | |
| SXI | Anthem BCBS of Ohio | |
| SXJ | Anthem Blue Cross of California | |
| SXK | Empire BCBS of New York | |
| SXL | Horizon BCBS of New Jersey | |
| SXM | Blue Shield of California | |
| SXN | Regence Blue Cross Blue Shield of Oregon | |
| SXO | BCBS of Michigan | |
| SXP | BCBS of Georgia | |
| SXQ | Anthem BCBS of Ohio | |
| SXR | BCBS of Illinois | |
| SXS | Regence BCBS | |
| SXT | Carefirst Administrators | |
| SXU | Blue Shield of California | |
| SXV | BCBS of Western New York | |
| SXW | BCBS of Texas | |
| SXX | BCBS of Illinois | |
| SXY | BCBS of Massachusetts | |
| SXZ | Anthem Blue Cross of California | |
| SYA | Carefirst BCBS of Maryland | |
| SYB | BCBS of Illinois | |
| SYC | Anthem BCBS of Ohio | |
| SYD | BCBS of Arizona | |
| SYE | BCBS of South Carolina | |
| SYF | BCBS of Alabama | |
| SYG | BCBS of Minnesota | |
| SYH | BCBS of Minnesota | |
| SYI | BCBS of Minnesota | |
| SYJ | Wellmark BCBS | |
| SYK | Regence BCBS of Idaho | |
| SYL | Unassigned Prefix | |
| SYM | Carefirst BCBS of Maryland | |
| SYN | Unassigned Prefix | |
| SYO | BCBS of Michigan | |
| SYP | Anthem Blue Cross of California | |
| SYQ | BCBS of Michigan | |
| SYR | Highmark BCBS | |
| SYS | Highmark BCBS | |
| SYT | BCBS of Tennessee | |
| SYU | BCBS of Massachusetts | |
| SYV | Unassigned Prefix | |
| SYW | BCBS of Tennessee | |
| SYX | BCBS of Alabama | |
| SYY | BCBS of Illinois | |
| SYZ | Premera Blue Cross | |
| SZA | Independence Blue Cross | |
| SZB | Regence Blue Cross Blue Shield of Oregon | |
| SZC | BCBS of Illinois | |
| SZD | BCBS of Massachusetts | |
| SZE | BCBS of Illinois | |
| SZF | BCBS of Illinois | |
| SZG | Blue Cross of Idaho | |
| SZH | Anthem BCBS of Virginia | |
| SZI | Anthem BCBS of Georgia | |
| SZJ | BCBS of Delaware | |
| SZK | Wellmark BCBS | |
| SZL | Carefirst Administrators | |
| SZM | Highmark BCBS | |
| SZN | BCBS of Nebraska | |
| SZO | Blue Shield of Northeastern New York | |
| SZP | Premera Blue Cross | |
| SZQ | Anthem BCBS of Ohio | |
| SZR | Premera Blue Cross | |
| SZS | Anthem BCBS of Ohio | |
| SZT | BCBS of Massachusetts | |
| SZU | BCBS of Texas | |
| SZV | Unassigned Prefix | |
| SZW | Anthem BCBS of Georgia | |
| SZX | Premera Blue Cross | |
| SZY | Anthem Blue Cross of California | |
| SZZ | Independence Blue Cross |