| PAA | Capital Blue Cross of Pennsylvania |
| PAB | BCBS of Tennessee |
| PAC | Capital Blue Cross of Pennsylvania |
| PAD | Anthem BCBS of Georgia |
| PAE | BCBS of Massachusetts |
| PAF | Anthem Blue Cross |
| PAG | Blue-Shield of California |
| PAH | Independence Blue Cross of Philadelphia /S. Pennsylvania |
| PAI | No Prefix Assigned |
| PAJ | BCBS of Illinois |
| PAK | Carefirst BCBS |
| PAL | Anthem BCBS of Georgia |
| PAM | Blue-Shield of California |
| PAN | BCBS of Illinois |
| PAO | Carefirst BCBS |
| PAP | BCBS of Illinois |
| PAQ | Anthem BCBS of Ohio |
| PAR | No Prefix Assigned |
| PAS | BCBS of Illinois |
| PAT | Wellmark BCBS |
| PAU | No Prefix Assigned |
| PAV | Anthem BCBS of Virginia |
| PAW | BCBS of North Carolina |
| PAX | Anthem BCBS of Georgia |
| PAY | Excellus BCBS of New York |
| PAZ | Premera BCBS of Alaska |
| PBA | BCBS of Massachusetts |
| PBB | Florida Blue |
| PBC | Anthem BCBS of Missouri |
| PBD | Anthem BCBS of Missouri |
| PBE | Anthem Blue Cross |
| PBF | Premera BCBS of Alaska |
| PBG | Blue-Shield of California |
| PBH | BCBS of Louisiana |
| PBI | BCBS of Western New York |
| PBJ | Anthem BCBS of Ohio |
| PBK | No Prefix Assigned |
| PBL | Blue-Shield of California |
| PBM | No Prefix Assigned |
| PBN | Blue-Shield of Northeastern New York |
| PBO | Blue-Shield of California |
| PBP | Wellmark BCBS |
| PBQ | Premera Blue Cross of Alaska |
| PBR | BCBS of Minnesota |
| PBS | No Prefix Assigned |
| PBT | BCBS of Minnesota |
| PBU | BCBS of Illinois |
| PBV | Premera BCBS of Alaska |
| PBW | BCBS of Texas |
| PBX | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PBY | BCBS of Western New York |
| PBZ | Empire BCBS of New York |
| PCA | Empire BCBS of New York |
| PCB | No Prefix Assigned |
| PCC | No Prefix Assigned |
| PCD | BCBS of Texas |
| PCE | No Prefix Assigned |
| PCF | Carefirst BCBS |
| PCG | BCBS of Kansas City |
| PCH | BCBS of North Carolina |
| PCI | Blue-Shield of California |
| PCJ | Anthem BCBS of Georgia |
| PCK | Empire BCBS of New York |
| PCL | BCBS of Arizona |
| PCM | Premera BCBS of Alaska |
| PCN | Carefirst BCBS |
| PCO | Anthem BCBS of Ohio |
| PCP | Anthem BCBS of Colorado |
| PCQ | No Prefix Assigned |
| PCR | Carefirst BCBS |
| PCS | Wellmark BCBS |
| PCT | Anthem BCBS of Ohio |
| PCU | Carefirst BCBS |
| PCV | Blue-Shield of California |
| PCW | Anthem BCBS of Ohio |
| PCX | Wellmark BCBS |
| PCY | Anthem BCBS of Ohio |
| PCZ | No Prefix Assigned |
| PDA | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PDB | BCBS of Texas |
| PDC | Anthem BCBS of Georgia |
| PDD | No Prefix Assigned |
| PDE | Blue-Shield of California |
| PDF | Anthem BCBS of Ohio |
| PDG | BCBS of Tennessee |
| PDH | Anthem BCBS of Colorado |
| PDI | Wellmark BCBS |
| PDJ | Wellmark BCBS |
| PDK | Anthem Blue Cross |
| PDL | Anthem Blue Cross |
| PDM | No Prefix Assigned |
| PDN | BCBS of Minnesota |
| PDO | BCBS of Alabama |
| PDP | BCBS of Minnesota |
| PDQ | Blue-Shield of California |
| PDR | Regence BCBS |
| PDS | Carefirst BCBS |
| PDT | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PDU | BCBS of Illinois |
| PDV | Wellmark BCBS |
| PDW | BCBS of Illinois |
| PDX | BCBS of Michigan |
| PDY | BCBS of Illinois |
| PDZ | BCBS of Alabama |
| PEA | Anthem BCBS of Colorado |
| PEB | Capital Blue Cross of Pennsylvania |
| PEC | BCBS of Texas |
| PED | Anthem BCBS of Ohio |
| PEE | No Prefix Assigned |
| PEF | BCBS of Alabama |
| PEG | BCBS of Texas |
| PEH | Blue-Shield of Northeastern New York |
| PEI | No Prefix Assigned |
| PEJ | Blue Cross of Idaho |
| PEK | Empire BCBS of New York |
| PEL | Anthem BCBS of Missouri |
| PEM | BCBS of Minnesota |
| PEN | No Prefix Assigned |
| PEO | No Prefix Assigned |
| PEP | Blue-Shield of California |
| PEQ | No Prefix Assigned |
| PER | Wellmark BCBS |
| PES | BCBS of Texas |
| PET | BCBS of Rhode Island |
| PEU | Anthem BCBS of Missouri |
| PEV | Carefirst BCBS |
| PEW | No Prefix Assigned |
| PEX | BCBS of Alabama |
| PEY | No Prefix Assigned |
| PEZ | No Prefix Assigned |
| PFA | Highmark Blue-Shield of Pennsylvania |
| PFB | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PFC | Blue-Shield of California |
| PFD | Blue-Shield of California |
| PFE | Anthem BCBS of Virginia |
| PFF | Anthem BCBS of Virginia |
| PFG | BCBS of Kansas City |
| PFH | Anthem BCBS of Wisconsin |
| PFI | Highmark BCBS of Pennsylvania |
| PFJ | BCBS of Illinois |
| PFK | BCBS of Massachusetts |
| PFL | No Prefix Assigned |
| PFM | Regence BCBS |
| PFN | No Prefix Assigned |
| PFO | No Prefix Assigned |
| PFP | Premera BCBS of Alaska |
| PFQ | Blue-Shield of California |
| PFR | Horizon BCBS of New Jersey |
| PFS | Anthem Blue Cross |
| PFT | Anthem BCBS of Virginia |
| PFU | Florida Blue |
| PFV | No Prefix Assigned |
| PFW | Anthem BCBS of Missouri |
| PFX | Capital Blue Cross of Pennsylvania |
| PFY | BCBS of Illinois |
| PFZ | Horizon BCBS of New Jersey |
| PGA | BCBS of North Carolina |
| PGB | No Prefix Assigned |
| PGC | BCBS of Tennessee |
| PGD | Blue-Shield of California |
| PGE | BCBS of Arizona |
| PGF | No Prefix Assigned |
| PGG | Anthem BCBS of Wisconsin |
| PGH | No Prefix Assigned |
| PGI | BCBS of Illinois |
| PGJ | No Prefix Assigned |
| PGK | BCBS of Tennessee |
| PGL | No Prefix Assigned |
| PGM | Highmark BCBS of Pennsylvania |
| PGN | No Prefix Assigned |
| PGO | Anthem BCBS of Ohio |
| PGP | Florida Blue |
| PGQ | Arkansas BCBS |
| PGR | BCBS of Kansas City |
| PGS | Anthem BCBS of Ohio |
| PGT | No Prefix Assigned |
| PGU | Anthem BCBS of Georgia |
| PGV | Anthem BCBS of Georgia |
| PGW | BCBS of Alabama |
| PGX | BCBS of Alabama |
| PGY | Empire BCBS of New York |
| PGZ | BCBS of Illinois |
| PHA | No Prefix Assigned |
| PHB | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PHC | Anthem BCBS of Wisconsin |
| PHD | No Prefix Assigned |
| PHE | No Prefix Assigned |
| PHF | BCBS of Kansas |
| PHG | Blue-Shield of California |
| PHH | No Prefix Assigned |
| PHI | Blue-Shield of California |
| PHJ | Capital Blue Cross of Pennsylvania |
| PHK | No Prefix Assigned |
| PHL | Blue-Shield of California |
| PHM | Anthem Blue Cross |
| PHN | BCBS of Rhode Island |
| PHO | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PHP | Anthem BCBS of Georgia |
| PHQ | Anthem BCBS of Georgia |
| PHR | No Prefix Assigned |
| PHS | Anthem BCBS of Georgia |
| PHT | BCBS of Alabama |
| PHU | Blue-Shield of California |
| PHV | No Prefix Assigned |
| PHW | Carefirst BCBS |
| PHX | Anthem BCBS of Ohio |
| PHY | Empire BCBS of New York |
| PHZ | No Prefix Assigned |
| PIA | Carefirst BCBS |
| PIB | BCBS of Minnesota |
| PIC | No Prefix Assigned |
| PID | Anthem BCBS of Wisconsin |
| PIE | No Prefix Assigned |
| PIF | Wellmark BCBS |
| PIG | No Prefix Assigned |
| PIH | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PII | Wellmark BCBS |
| PIJ | No Prefix Assigned |
| PIK | Anthem BCBS of Ohio |
| PIL | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PIM | Anthem BCBS of Wisconsin |
| PIN | No Prefix Assigned |
| PIO | BCBS of Tennessee |
| PIP | Arkansas BCBS |
| PIQ | Arkansas BCBS |
| PIR | No Prefix Assigned |
| PIS | No Prefix Assigned |
| PIT | BCBS of Massachusetts |
| PIU | Carefirst BCBS |
| PIV | No Prefix Assigned |
| PIW | Highmark BCBS of Pennsylvania |
| PIX | BCBS of Alabama |
| PIY | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PIZ | BCBS of Alabama |
| PJA | BCBS of Alabama |
| PJB | Regence BCBS |
| PJC | Anthem Blue Cross |
| PJD | BCBS of Michigan |
| PJE | Regence BCBS |
| PJF | Wellmark BCBS |
| PJG | No Prefix Assigned |
| PJH | No Prefix Assigned |
| PJI | BCBS of Michigan |
| PJJ | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PJK | BCBS of South Carolina |
| PJL | BCBS of Western New York |
| PJM | No Prefix Assigned |
| PJN | Carefirst BCBS |
| PJO | BCBS of North Carolina |
| PJP | BCBS of Illinois |
| PJQ | Wellmark BCBS |
| PJR | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PJS | BCBS of Illinois |
| PJT | BCBS of Illinois |
| PJU | Highmark BCBS of Pennsylvania |
| PJV | Anthem BCBS of Georgia |
| PJW | Anthem BCBS of Ohio |
| PJX | Anthem BCBS of Georgia |
| PJY | Horizon BCBS of New Jersey |
| PJZ | Florida Blue |
| PKA | BCBS of Illinois |
| PKB | Florida Explore-My-Plan |
| PKC | No Prefix Assigned |
| PKD | Blue-Shield of California |
| PKE | No Prefix Assigned |
| PKF | BCBS of Alabama |
| PKG | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PKH | Anthem BCBS of Virginia |
| PKI | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PKJ | Anthem BCBS of Ohio |
| PKK | No Prefix Assigned |
| PKL | BCBS of Michigan |
| PKM | BCBS of Michigan |
| PKN | Highmark BCBS of Pennsylvania |
| PKO | Premera BCBS of Alaska |
| PKP | Horizon BCBS of New Jersey |
| PKQ | Anthem Blue Cross |
| PKR | Wellmark BCBS |
| PKS | Anthem Blue Cross |
| PKT | BCBS of Minnesota |
| PKU | No Prefix Assigned |
| PKV | BCBS of Louisiana |
| PKW | Anthem BCBS of Ohio |
| PKX | Anthem BCBS of Connecticut |
| PKY | No Prefix Assigned |
| PKZ | No Prefix Assigned |
| PLA | No Prefix Assigned |
| PLB | No Prefix Assigned |
| PLC | BCBS of Alabama |
| PLD | No Prefix Assigned |
| PLE | BCBS of Michigan |
| PLF | No Prefix Assigned |
| PLG | Carefirst BCBS |
| PLH | Anthem BCBS of Ohio |
| PLI | No Prefix Assigned |
| PLJ | Empire BCBS of New York |
| PLK | No Prefix Assigned |
| PLL | Anthem Blue Cross |
| PLM | BCBS of Massachusetts |
| PLN | Anthem BCBS of Ohio |
| PLO | BCBS of Massachusetts |
| PLP | BCBS of Minnesota |
| PLQ | No Prefix Assigned |
| PLR | BCBS of Western New York |
| PLS | Wellmark BCBS |
| PLT | Empire BCBS of New York |
| PLU | BCBS of Illinois |
| PLV | Anthem BCBS of Virginia |
| PLW | Anthem BCBS of Ohio |
| PLX | No Prefix Assigned |
| PLY | No Prefix Assigned |
| PLZ | No Prefix Assigned |
| PMA | BCBS of Arizona |
| PMB | BCBS of Illinois |
| PMC | Anthem BCBS of Ohio |
| PMD | BCBS of North Carolina |
| PME | BCBS of Texas |
| PMF | No Prefix Assigned |
| PMG | Anthem BCBS of Ohio |
| PMH | No Prefix Assigned |
| PMI | Carefirst BCBS |
| PMJ | No Prefix Assigned |
| PMK | BCBS of Arizona |
| PML | No Prefix Assigned |
| PMM | Anthem BCBS of Indiana |
| PMN | No Prefix Assigned |
| PMO | BCBS of South Carolina |
| PMP | Wellmark BCBS |
| PMQ | Wellmark BCBS |
| PMR | Florida Blue |
| PMS | Blue-Shield of California |
| PMT | Premera BCBS of Alaska |
| PMU | BCBS of Minnesota |
| PMV | BCBS of Louisiana |
| PMW | No Prefix Assigned |
| PMX | BCBS of Illinois |
| PMY | Anthem BCBS of Missouri |
| PMZ | BCBS of South Carolina |
| PNA | Carefirst BCBS |
| PNB | No Prefix Assigned |
| PNC | Premera BCBS of Alaska |
| PND | Carefirst BCBS |
| PNE | Blue-Shield of California |
| PNF | BCBS of Illinois |
| PNG | No Prefix Assigned |
| PNH | Capital Blue Cross of Pennsylvania |
| PNI | BCBS of Michigan |
| PNJ | No Prefix Assigned |
| PNK | BCBS of Illinois |
| PNL | Capital Blue Cross of Pennsylvania |
| PNM | Highmark BCBS of Pennsylvania |
| PNN | Wellmark BCBS |
| PNO | Anthem Blue Cross |
| PNP | Anthem Blue Cross |
| PNQ | Premera BCBS of Alaska |
| PNR | BCBS of Minnesota |
| PNS | Wellmark BCBS |
| PNT | Premera BCBS of Alaska |
| PNU | BCBS of Texas |
| PNV | No Prefix Assigned |
| PNW | Wellmark BCBS |
| PNX | Highmark BCBS of Pennsylvania |
| PNY | No Prefix Assigned |
| PNZ | Wellmark BCBS |
| POA | Anthem BCBS of Ohio |
| POB | Wellmark BCBS |
| POC | No Prefix Assigned |
| POD | Blue-Shield of California |
| POE | Blue-Shield of California |
| POF | Blue Cross of Idaho |
| POG | Anthem Blue Cross |
| POH | Anthem Blue Cross |
| POI | Highmark BCBS of Pennsylvania |
| POJ | No Prefix Assigned |
| POK | Blue-Shield of California |
| POL | BCBS of Kansas City |
| POM | No Prefix Assigned |
| PON | Premera BCBS of Alaska |
| POO | Blue-Shield of California |
| POP | Blue-Shield of California |
| POQ | BCBS of Massachusetts |
| POR | Wellmark BCBS |
| POS | No Prefix Assigned |
| POT | Blue-Shield of California |
| POU | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| POV | Anthem Blue Cross |
| POW | Blue-Shield of California |
| POX | No Prefix Assigned |
| POY | Blue-Shield of California |
| POZ | No Prefix Assigned |
| PPA | BCBS of Alabama |
| PPB | Premera BCBS of Alaska |
| PPC | Anthem BCBS of Virginia |
| PPD | Anthem BCBS of Kentucky |
| PPE | Highmark BCBS of Pennsylvania |
| PPF | BCBS of Illinois |
| PPG | Highmark BCBS of Pennsylvania |
| PPH | No Prefix Assigned |
| PPI | Anthem BCBS of Virginia |
| PPJ | BCBS of Minnesota |
| PPK | BCBS of Illinois |
| PPL | Regence BCBS |
| PPM | Highmark BCBS of Pennsylvania |
| PPN | No Prefix Assigned |
| PPO | BCBS of Illinois |
| PPP | BCBS of Illinois |
| PPQ | BCBS of Illinois |
| PPR | BCBS of Alabama |
| PPS | Premera BCBS of Alaska |
| PPT | Anthem BCBS of Georgia |
| PPU | BCBS of Illinois |
| PPV | Blue Cross of Idaho |
| PPW | Highmark BCBS of Pennsylvania |
| PPX | Florida Blue |
| PPY | BCBS of Minnesota |
| PPZ | No Prefix Assigned |
| PQA | Premera BCBS of Alaska |
| PQB | BCBS of Alabama |
| PQC | No Prefix Assigned |
| PQD | Anthem Blue Cross |
| PQE | BCBS of Massachusetts |
| PQF | No Prefix Assigned |
| PQG | Empire BCBS of New York |
| PQH | Premera BCBS of Alaska |
| PQI | BCBS of Tennessee |
| PQJ | BCBS of Minnesota |
| PQK | BCBS of Kansas City |
| PQL | No Prefix Assigned |
| PQM | Highmark BCBS of Pennsylvania |
| PQN | No Prefix Assigned |
| PQO | Blue Cross of Idaho |
| PQP | Premera BCBS of Alaska |
| PQQ | Anthem BCBS of Colorado |
| PQR | Wellmark BCBS |
| PQS | BCBS of Massachusetts |
| PQT | Regence BCBS |
| PQU | Blue-Shield of California |
| PQV | Anthem Blue Cross |
| PQW | BCBS of Massachusetts |
| PQX | Anthem Blue Cross |
| PQY | No Prefix Assigned |
| PQZ | No Prefix Assigned |
| PRA | BCBS of Alabama |
| PRB | BCBS of Western New York |
| PRC | Blue-Shield of California |
| PRD | BCBS of Alabama |
| PRE | BCBS of Nebraska |
| PRF | Empire BCBS of New York |
| PRG | No Prefix Assigned |
| PRH | Anthem BCBS of Ohio |
| PRI | No Prefix Assigned |
| PRJ | Anthem BCBS of Virginia |
| PRK | No Prefix Assigned |
| PRL | Arkansas BCBS |
| PRM | BCBS of Tennessee |
| PRN | No Prefix Assigned |
| PRO | Carefirst BCBS |
| PRP | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PRQ | Wellmark BCBS |
| PRR | Anthem BCBS of Ohio |
| PRS | No Prefix Assigned |
| PRT | Regence BCBS |
| PRU | BCBS of Western New York |
| PRV | BCBS of Alabama |
| PRW | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PRX | BCBS of Alabama |
| PRY | BCBS of Kansas City |
| PRZ | BCBS of Illinois |
| PSA | BCBS of Massachusetts |
| PSB | BCBS of Texas |
| PSC | BCBS of Illinois |
| PSD | No Prefix Assigned |
| PSE | Blue-Shield of California |
| PSF | No Prefix Assigned |
| PSG | No Prefix Assigned |
| PSH | Anthem BCBS of Connecticut |
| PSI | Blue-Shield of California |
| PSJ | No Prefix Assigned |
| PSK | No Prefix Assigned |
| PSL | Anthem BCBS of Virginia |
| PSM | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PSN | No Prefix Assigned |
| PSO | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PSP | Blue-Shield of California |
| PSQ | Anthem BCBS of Georgia |
| PSR | No Prefix Assigned |
| PSS | Wellmark BCBS |
| PST | BCBS of North Carolina |
| PSU | Premera BCBS of Alaska |
| PSV | Anthem BCBS of Ohio |
| PSW | No Prefix Assigned |
| PSX | Anthem BCBS of Nevada |
| PSY | Anthem BCBS of Connecticut |
| PSZ | BCBS of Louisiana |
| PTA | Anthem Blue Cross |
| PTB | Blue-Shield of California |
| PTC | Blue-Shield of California |
| PTD | BCBS of Kansas City |
| PTE | BCBS of Texas |
| PTF | No Prefix Assigned |
| PTG | Anthem BCBS of Ohio |
| PTH | Anthem BCBS of Connecticut |
| PTI | Wellmark BCBS |
| PTJ | No Prefix Assigned |
| PTK | Capital Blue Cross of Pennsylvania |
| PTL | BCBS of Illinois |
| PTM | Capital Blue Cross of Pennsylvania |
| PTN | BCBS of Illinois |
| PTO | Anthem BCBS of Ohio |
| PTP | Carefirst BCBS |
| PTQ | Empire BCBS of New York |
| PTR | Arkansas BCBS |
| PTS | Anthem BCBS of Kentucky |
| PTT | BCBS of Tennessee |
| PTU | Anthem BCBS of Georgia |
| PTV | Anthem BCBS of Wisconsin |
| PTW | BCBS of Rhode Island |
| PTX | BCBS of Montana |
| PTY | Anthem BCBS of Indiana |
| PTZ | No Prefix Assigned |
| PUA | BCBS of Michigan |
| PUB | Horizon BCBS of New Jersey |
| PUC | Wellmark BCBS |
| PUD | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PUE | Blue-Shield of California |
| PUF | No Prefix Assigned |
| PUG | BCBS of Michigan |
| PUH | Highmark BCBS of Pennsylvania |
| PUI | No Prefix Assigned |
| PUJ | Anthem BCBS of Georgia |
| PUK | BCBS of South Carolina |
| PUL | Premera BCBS of Alaska |
| PUM | BCBS of South Carolina |
| PUN | No Prefix Assigned |
| PUO | BCBS of Arizona |
| PUP | Florida Blue |
| PUQ | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PUR | Wellmark BCBS |
| PUS | BCBS of Arizona |
| PUT | BCBS of Michigan |
| PUU | BCBS of Michigan |
| PUV | BCBS of Michigan |
| PUW | BCBS of Massachusetts |
| PUX | Premera BCBS of Alaska |
| PUY | Wellmark BCBS |
| PUZ | No Prefix Assigned |
| PVA | BCBS of Kansas City |
| PVB | Wellmark BCBS |
| PVC | BCBS of Rhode Island |
| PVD | BCBS of Illinois |
| PVE | No Prefix Assigned |
| PVF | BCBS of Tennessee |
| PVG | Anthem Blue Cross |
| PVH | BCBS of Alabama |
| PVI | No Prefix Assigned |
| PVJ | Anthem BCBS of Ohio |
| PVK | Anthem Blue Cross |
| PVL | No Prefix Assigned |
| PVM | No Prefix Assigned |
| PVN | Anthem BCBS of Virginia |
| PVO | Carefirst BCBS |
| PVP | Anthem Blue Cross |
| PVQ | No Prefix Assigned |
| PVR | Anthem BCBS of Ohio |
| PVS | No Prefix Assigned |
| PVT | Anthem BCBS of Ohio |
| PVU | No Prefix Assigned |
| PVV | BCBS of South Carolina |
| PVW | Florida Blue |
| PVX | BCBS of North Carolina |
| PVY | BCBS of North Carolina |
| PVZ | No Prefix Assigned |
| PWA | Florida Blue |
| PWB | Anthem BCBS of Virginia |
| PWC | Regence BCBS |
| PWD | BCBS of Illinois |
| PWE | Empire BCBS of New York |
| PWF | Anthem Blue Cross |
| PWG | Anthem BCBS of Virginia |
| PWH | No Prefix Assigned |
| PWI | No Prefix Assigned |
| PWJ | Blue Cross North Carolina |
| PWK | BCBS of Massachusetts |
| PWL | Anthem BCBS of Colorado |
| PWM | Wellmark BCBS |
| PWN | Anthem BCBS of Ohio |
| PWO | Blue-Shield of California |
| PWP | Empire BCBS of New York |
| PWQ | No Prefix Assigned |
| PWR | No Prefix Assigned |
| PWS | Anthem BCBS of Virginia |
| PWT | Anthem BCBS of Georgia |
| PWU | Wellmark BCBS |
| PWV | BCBS of Illinois |
| PWW | BCBS of Illinois |
| PWX | Blue Cross of Idaho |
| PWY | No Prefix Assigned |
| PWZ | BCBS of Rhode Island |
| PXA | Anthem BCBS of Ohio |
| PXB | Florida Blue |
| PXC | No Prefix Assigned |
| PXD | BCBS of Arizona |
| PXE | Premera BCBS of Alaska |
| PXF | No Prefix Assigned |
| PXG | Arkansas BCBS |
| PXH | No Prefix Assigned |
| PXI | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PXJ | Florida Blue |
| PXK | No Prefix Assigned |
| PXL | BCBS of Massachusetts |
| PXM | No Prefix Assigned |
| PXN | Florida Blue |
| PXO | BCBS of Arizona |
| PXP | Anthem BCBS of Kentucky |
| PXQ | Anthem BCBS of Wisconsin |
| PXR | Anthem BCBS of Ohio |
| PXS | BCBS of Illinois |
| PXT | No Prefix Assigned |
| PXU | BCBS of Michigan |
| PXV | Capital Blue Cross of Pennsylvania |
| PXW | BCBS of Michigan |
| PXX | No Prefix Assigned |
| PXY | No Prefix Assigned |
| PXZ | No Prefix Assigned |
| PYA | Blue-Shield of California |
| PYB | Empire BCBS of New York |
| PYC | No Prefix Assigned |
| PYD | No Prefix Assigned |
| PYE | BCBS of Illinois |
| PYF | Premera BCBS of Alaska |
| PYG | Carefirst BCBS |
| PYH | BCBS of Texas |
| PYI | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PYJ | BCBS of Michigan |
| PYK | Anthem BCBS of Wisconsin |
| PYL | BCBS of Western New York |
| PYM | Wellmark BCBS |
| PYN | Anthem BCBS of Ohio |
| PYO | BCBS of North Carolina |
| PYP | Anthem BCBS of Virginia |
| PYQ | Anthem BCBS of Ohio |
| PYR | No Prefix Assigned |
| PYS | Anthem BCBS of Ohio |
| PYT | No Prefix Assigned |
| PYU | No Prefix Assigned |
| PYV | No Prefix Assigned |
| PYW | No Prefix Assigned |
| PYX | No Prefix Assigned |
| PYY | Wellmark BCBS |
| PYZ | Anthem BCBS of Georgia |
| PZA | BCBS of Texas |
| PZB | Anthem BCBS of Ohio |
| PZC | No Prefix Assigned |
| PZD | BCBS of Illinois |
| PZE | No Prefix Assigned |
| PZF | Blue-Shield of California |
| PZG | Anthem Blue Cross |
| PZH | No Prefix Assigned |
| PZI | BCBS of South Carolina |
| PZJ | BCBS of Michigan |
| PZK | No Prefix Assigned |
| PZL | No Prefix Assigned |
| PZM | Anthem Blue Cross |
| PZN | Anthem BCBS of Ohio |
| PZO | Independence Blue Cross of Philadelphia/S.Pennsylvania |
| PZP | No Prefix Assigned |
| PZQ | Florida Blue |
| PZR | Empire BCBS of New York |
| PZS | Wellmark BCBS |
| PZT | Wellmark BCBS |
| PZU | No Prefix Assigned |
| PZV | Anthem BCBS of Virginia |
| PZW | Wellmark BCBS |
| PZX | No Prefix Assigned |
| PZY | BCBS of Western New York |
| PZZ | BCBS of Western New York |
| P3L | Premera Blue Cross |
| P3M | Premera Blue Cross |
| P3T | Premera Blue Cross |
| P4T | Premera Blue Cross |
| P6B | Premera Blue Cross |
| P8M | Premera Blue Cross |
| P9M | Premera Blue Cross |
