Blues' HMOs enrollment increases to 1.2 million.
D054598:Blue Cross Blue Shield Insurance Plans / Q000706:statistics & numerical data*; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D007350:Insurance, Hospitalization / Q000706:statistics & numerical data*; D007357:Insurance, Physician Services / Q000706:statistics & numerical data*; D014481:United States