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

Dr. Diane S Morgenthaler, MD

Individual provider Internal Medicine Physician · NPI 1578708111

Dr. Diane S Morgenthaler, MD is an Internal Medicine in Ledyard, Connecticut. Graduated from Medical College of Pennsylvania in 1988, 38 years ago. Practices with Mashantucket Pequot Tribal Council, a 3-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
38
Trained at
Medical College of Pennsylvania
Licensed in
CT
In the registry since
2008
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

75 Norwich Westerly Rd
Ledyard, CT 06339-1128
Phone: (860) 312-8000
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 033164 (CT)

Record details

NPI number1578708111
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 11, 2008
Last updated in NPPESJanuary 16, 2025
Certification dateJanuary 16, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolMEDICAL COLLEGE OF PENNSYLVANIA
Graduated 1988 (38 years in practice)
Group practice Mashantucket Pequot Tribal Council — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare