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Important Telephone Numbers and Addresses

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


Children's Medical Security Plan
PO Box 519
Andover, MA 01810
1-800-909-2677 (CMSP)

MassHealth
Central Processing Unit
PO Box 12924
Boston, MA 02112
1-800-843-7114

MassHealth Enrollment Center
1-888-665-9993


CMSP offers two preferred providers for outpatient lab services and mental health/substance abuse services. CMSP has contracted with these providers who have agreed to provide these services at negotiated rates. Maximize your benefits and get the most from your plan by using Quest Diagnostics for lab tests and Magellan Behavioral Health for mental health and substance abuse services.


Quest Diagnostics (Outpatient Laboratory)
1-800-842-1412

Magellan Behavioral Health
1-877-769-7245

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