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

Gregory Haman, MD

Individual provider Internal Medicine Physician · NPI 1033590773

Gregory Haman, MD practises Internal Medicine in Willimantic, Connecticut. Graduated from Harvard Medical School in 2015, 11 years ago. Practices with Hartford Healthcare Medical Group Inc, a 234-clinician group, works from 4 locations, accepts Medicare assignment and offers telehealth. Licensed in Connecticut and Illinois.

Years since qualifying
11
Trained at
Harvard Medical School
Licensed in
CT, IL
In the registry since
2015
Specialties on file
2
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

5 Founders St Ste 100
Willimantic, CT 06226-2049
Phone: (860) 423-9764
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • Cermak Health Services Of Cook County, Chicago, IL 60608-5107 — (773) 674-7488
  • 5841 S Maryland Ave, Chicago, IL 60637-1447 — (773) 702-6840
  • 5841 S Maryland Ave, Chicago, IL 60637-1447 — (773) 702-6840

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 65062 (CT)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125066888 (IL)

Record details

NPI number1033590773
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 17, 2015
Last updated in NPPESMay 6, 2020
Certification dateMay 6, 2020

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 2015 (11 years in practice)
Group practice Hartford Healthcare Medical Group Inc — 234 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients251
Services billed 1,113 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Hartford Healthcare Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 234 clinicians in the practice; 12 are shown here.

Other providers in Willimantic