Feds approve 18-member Blues HMO network.
D054598:Blue Cross Blue Shield Insurance Plans / Q000458:organization & administration*; D006264:Health Benefit Plans, Employee / Q000191:economics; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D007342:Insurance Benefits / Q000191:economics; D007350:Insurance, Hospitalization / Q000458:organization & administration*; D007357:Insurance, Physician Services / Q000458:organization & administration*; D014481:United States