Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. John Joseph Hennessey, MD

Individual provider Internal Medicine Physician · NPI 1215916564

Dr. John Joseph Hennessey, MD is an Internal Medicine in Gales Ferry, Connecticut. Graduated from Tufts University School of Medicine in 1996, 30 years ago. Practices with Gales Ferry Medical Group LLC, a 4-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
30
Trained at
Tufts University School of Medicine
Licensed in
CT
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1527 Route 12 Ste 1
Gales Ferry, CT 06335-1800
Phone: (860) 464-7253
Fax: (860) 464-7404
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 037592 (CT)

Record details

NPI number1215916564
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 14, 2006
Last updated in NPPESNovember 30, 2012

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolTUFTS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice Gales Ferry Medical Group Llc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Gales Ferry