Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Jonathan J Fillmore, MD

Individual provider Endocrinology, Diabetes & Metabolism Physician · NPI 1578592713

Jonathan J Fillmore, MD practises Endocrinology in Trumbull, Connecticut. Graduated from Js Weill Medical College, Cornell University in 1997, 29 years ago. Practices with Prospect CT Medical Foundation Inc, a 289-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
29
Trained at
Js Weill Medical College, Cornell University
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

5520 Park Ave Ste 306
Trumbull, CT 06611-3463 Not confirmed with CMS for 16 years — call before visiting
Phone: (203) 373-7388
Fax: (203) 373-7472
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Endocrinology, Diabetes & Metabolism Physician (primary) Taxonomy 207RE0101X · Licence 039461 (CT)

Record details

NPI number1578592713
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 1, 2006
Last updated in NPPESDecember 9, 2009

Medicare enrollment

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

Medicare specialtyENDOCRINOLOGY
Medical schoolJS WEILL MEDICAL COLLEGE, CORNELL UNIVERSITY
Graduated 1997 (29 years in practice)
Group practice Prospect Ct Medical Foundation Inc — 289 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients304
Services billed 2,524 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,055 35 payments · a meal or drink at a meeting or visit, not a fee
Education $7 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Griffin Hospital Hospital · Derby, CT · listed as The Griffin Hospital
  • Saint Mary'S Hospital Hospital · Waterbury, CT · listed as Saint Mary's Hospital, Inc
  • Waterbury Hospital Hospital · Waterbury, CT

Colleagues at Prospect CT Medical Foundation Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 289 clinicians in the practice; 12 are shown here.

Other providers in Trumbull