HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CT

JOHN J HENNESSEY, MD

INTERNAL MEDICINE

Medical school: TUFTS UNIVERSITY SCHOOL OF MEDICINE

Graduated: 1996

NPI: 1215916564

Practice Locations (2)

GALES FERRY MEDICAL GROUP LLC

1527 ROUTE 12

GALES FERRY, CT 063351800

8604647274

PTSMA INC

37 S BROAD ST, UNIT 12

PAWCATUCK, CT 063797909

8604951919

Source: CMS National Downloadable File, September 2026.

JOHN HENNESSEY, MD | HealthCareAtlasUSA