Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Frank Joseph Mongillo III, MD

Individual provider Internal Medicine Physician · NPI 1811917289

Dr. Frank Joseph Mongillo III, MD is an Internal Medicine in New Haven, Connecticut. Graduated from George Washington University School of Medicine in 1994, 32 years ago. Accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
32
Trained at
George Washington 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

26 Elm St
New Haven, CT 06510-2006
Phone: (203) 776-6845
Fax: (203) 777-9020
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 035706 (CT)

Record details

NPI number1811917289
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 20, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolGEORGE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1994 (32 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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