Summary

Dr. Jonathan Fillmore is an endocrinologist specializing in diabetes and metabolism with nearly three decades of experience treating patients. He earned his medical degree from Weill Cornell Medical College and completed his residency training at Yale University School of Medicine. His extensive background has given him deep expertise in managing complex hormone and metabolic disorders. Dr. Fillmore is fluent in both English and Spanish, allowing him to care for diverse patient populations.

Dr. Fillmore practices at Saint Vincents Medical Center and Yale New Haven Hospital, with locations in Middlebury, New Haven, and Bridgeport, Connecticut. He focuses primarily on treating various forms of diabetes, including type 2 diabetes in both adults and younger patients. His approach includes comprehensive blood testing and glucose monitoring to help patients achieve better diabetes control. Patients rate Dr. Fillmore 4.0 out of 5 stars for his compassionate care and clinical expertise.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4
  • 29 years of experience
  • speaks English, Spanish
  • Yale University School Of Medicine
  • 17 written reviews
  • 1 specialty
  • 16 areas of expertise
  • 2 hospital affiliations
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Jonathan James Fillmore has 3 locations

Alliance Medical Group Middlebury

1625 Straits TpkeMiddlebury, CT 06762
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Yale New Haven Hospital

20 York StNew Haven, CT 06510

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Dr. Jonathan James Fillmore, MD
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Dr. Jonathan James Fillmore, MDDr. Prarthana DesaiErin Denise MartinDr. Joseph Anthony Lorenzo, MD
Endocrinology, Diabetes & MetabolismInternal MedicineNurse PractitionerEndocrinology, Diabetes & Metabolism
Accepts New Patients Accepts New Patients
29 Years of Experience 6 Years of Experience 52 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English, Spanish Speaks English, Spanish
Middlebury , CTDanbury , CTNew Haven , CTFarmington , CT
Med School: Weill Cornell Medical College Med School: G.M.E.R.S. Medical College Gotri Med School: Suny Downstate Medical Center College Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Jonathan James Fillmore

  • Accepts Medicare
  • Accepts Medicaid

Medical Specialties

Dr. Jonathan James Fillmore has the following specialty

Specialty Expertise

Dr. Jonathan James Fillmore has the following 16 areas of expertise

  • Acromegaly
  • Addison Disease
  • Bone Densitometry
  • Cushing Disease
  • Diabetes
  • Diabetes (Types I & II)
  • Diabetes Mellitus, Type 1
  • Endocrinology
  • Fatigue
  • Gland Issues
  • Hormones
  • Hyperthyroidism
  • Hypopituitarism
  • Hypothyroidism
  • Insulin Resistance
  • Polycystic Ovary Syndrome (PCOS)

Certifications, License, & Education

29 Years Experience

Dr. Jonathan James Fillmore holds an expired medical license in the state of Connecticut.

Medical License

Medical Doctor with an expired medical license in the state of Connecticut that expired in 2026.

Education & Training

Residency

Completed their residency at Yale University School Of Medicine.

Medical School

Graduated from Weill Cornell Medical College in 1997.

NPI Number

Dr. Fillmore's NPI number is 1578592713.

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Frequently Asked Questions

How can I make an appointment with Dr. Jonathan Fillmore?
You can find contact information for Dr. Jonathan Fillmore here on Vitals.
Does Dr. Jonathan Fillmore accept virtual/telehealth appointments?
Dr. Jonathan Fillmore has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Where is Dr. Jonathan Fillmore's office located?
Dr. Jonathan Fillmore's office is located at 1625 Straits Tpke, Middlebury, CT, 06762.
Which hospitals is Dr. Jonathan Fillmore affiliated with?
Dr. Jonathan Fillmore is affiliated with Saint Vincents Medical Center and Yale New Haven Hospital.
Does Dr. Jonathan Fillmore accept my insurance?
You can see the insurance plans that Dr. Jonathan Fillmore accepts on their Vitals profile.

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