STATE:

Commonwealth of Massachusetts

MassHealth

(800) 841-2900

https://www.mass.gov/topics/masshealth

New York State

NY Department of Health

(800) 541-2831

https://www.health.ny.gov/health_care

 FEDERAL:
 

The Center for Medicare and Medicaid Services (CMS)

(800) 633-4227

www.medicare.gov

https://www.medicare.gov/providers-services/claims-appeals-complaints/complaints

Social Security Administration

(800) 772-1213

www.ssa.gov/retirement

https://www.ssa.gov/medicare