Important Telephone Numbers and Addresses

If you need to call or write CMSP, please use the telephone numbers and addresses listed below.

For questions concerning benefits, providers, and claims, please contact CMSP Customer service at the following address.

For questions concerning eligibility changes, status, documentation, or premiums, please contact MassHealth Customer service at 1-800-841-2900.

CMSP offers outpatient-laboratory, behavioral-health, substance-abuse, dental, and pharmacy services through contracted providers.

CMSP has contracted with the following providers to provide CMSP members with the services they need. To get the most from your plan and to find a participating provider, please call the telephone numbers below or click and connect to our website www.cmspkids.com.