Laws in N.Y., Massachusetts may reduce Blues' advantage.
D054598:Blue Cross Blue Shield Insurance Plans; D006264:Health Benefit Plans, Employee / Q000331:legislation & jurisprudence*; D007348:Insurance, Health / Q000331:legislation & jurisprudence*; D007350:Insurance, Hospitalization / Q000331:legislation & jurisprudence; D008404:Massachusetts; D009518:New York