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

Michael Harris Nathanson, MD

Individual provider Gastroenterology Physician · NPI 1437132230

Michael Harris Nathanson, MD is an Internal Medicine in New Haven, Connecticut. Qualified in 1985, 41 years ago. Practices with Yale University, a 2,618-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Connecticut and Florida.

Years since qualifying
41
Licensed in
CT, FL
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

15 York St
New Haven, CT 06510-3221
Phone: (203) 785-4138
Fax: (203) 737-1345
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Additional practice locations (1)

  • 4805 Nw 2nd Ave, Boca Raton, FL 33431-4141 — (561) 961-0208

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 029365 (CT)
Gastroenterology Physician Taxonomy 207RG0100X · Licence ME158547 (FL)

Record details

NPI number1437132230
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 25, 2005
Last updated in NPPESApril 2, 2026
Certification dateApril 2, 2026
Mailing address15 York St, Lmp - 180, New Haven, CT 06510-3221

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesGASTROENTEROLOGY
Medical schoolOTHER
Graduated 1985 (41 years in practice)
Group practice Yale University — 2618 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in New Haven