Blue Cross Blue Shield of Massachusetts is an HMO and PPO Plan with a Medicare contract. Enrollment in Blue Cross Blue Shield of Massachusetts depends on contract renewal. Anthem Insurance Companies, Inc., Blue Cross and Blue Shield of Massachusetts, Inc., Blue Cross & Blue Shield of Rhode Island, and Blue Cross and Blue Shield of Vermont are the legal entities that have contracted as a joint enterprise with the Centers for Medicare & Medicaid Services (CMS) and are the risk-bearing entities for Blue MedicareRx (PDP) plans. The joint enterprise is a Medicare-approved Part D Sponsor. Enrollment in Blue MedicareRx (PDP) depends on contract renewal. You must continue to pay your Medicare Part B Premium.