Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Gregory David Gersten, MD

Individual provider Diagnostic Radiology Physician · NPI 1487688214

Dr. Gregory David Gersten, MD practises Diagnostic Radiology in Southbury, Connecticut. Graduated from Columbia University College of Physicians and Surgeons in 1990, 36 years ago. Practices with Saint Alphonsus Regional Medical Center Inc, a 673-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Connecticut, Idaho and North Dakota.

Years since qualifying
36
Trained at
Columbia University College of Physicians and Surgeons
Licensed in
CT, ID, ND
In the registry since
2006
Specialties on file
5
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

385 Main St S Union Sq
Southbury, CT 06488-4240
Phone: (203) 264-7999
Fax: (203) 264-7477
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1055 N Curtis Rd, Boise, ID 83706-1309 — (208) 367-4320
  • 3000 32nd Ave S, Fargo, ND 58103-6132 — (701) 364-8000

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 036955 (CT)
Body Imaging Physician Taxonomy 2085B0100X · Licence 036955 (CT)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 4271297 (ID)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence 036955 (CT)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 24716 (ND)

Record details

NPI number1487688214
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 10, 2006
Last updated in NPPESAugust 7, 2026
Certification dateAugust 7, 2026

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolCOLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduated 1990 (36 years in practice)
Group practice Saint Alphonsus Regional Medical Center Inc — 673 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations14 on file with Medicare

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 patients902
Services billed 3,921 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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 $1,546 14 payments · a meal or drink at a meeting or visit, 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.

Colleagues at Saint Alphonsus Regional Medical Center Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 673 clinicians in the practice; 12 are shown here.

Other providers in Southbury