children's medical security plan phone number
Who to Contact with Questions. If you need to call or write to CMSP, please use the telephone numbers and addresses listed below. Call CMSP Customer Service at 1-800-909-2677 for: CMSP covered services  medical, dental, vision and behavioral health only. For questions about your pharmacy benefits, please call MassHealth Customer Service (see below).
CMS Providers. At Children's Medical Services, we recognize that our providers are the foundation of the health care services we deliver; that is why we recruit only the most talented physicians and health care providers to meet the needs of the special children we serve.