Gregory Haman, M.D.
Internal Medicine · Willimantic, CT
At a glance
5 Founders St Ste 100, Willimantic, CT 06226-2049
NPPES record updated May 6, 2020. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
5 Founders St Ste 100Willimantic, CT 06226-2049
Additional reported practice locations
5841 S Maryland AveRoom A700; Mc-7082
Chicago, IL 606371447
Phone: 7737026840 5841 S Maryland Ave
Room A700; Mc-7082
Chicago, IL 606371447
Phone: 7737026840 Cermak Health Services Of Cook County
2800 South California Avenue
Chicago, IL 606085107
Phone: 7736747488
Education & affiliations
- Medical / professional school
- Harvard Medical School
- Graduation year
- 2015
- CMS specialties
- Internal Medicine
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- Hartford Hospital Hartford, CT
- William W Backus Hospital Norwich, CT
- Windham Community Memorial Hospital Willimantic, CT
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Internal Medicine
- Taxonomy code
- 207R00000X
- Enumeration date
- Jun 17, 2015
- Record updated
- May 6, 2020
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207R00000X
License reported: 125066888 IL
207R00000X · Primary
License reported: 65062 CT
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
5 Founders St Ste 100Willimantic, CT 06226-2049
- Phone
- (860) 423-9764
Mailing address
1290 SILAS DEANE HWYHHC CVO ENROLLMENT 1ST FLOOR
WETHERSFIELD, CT 06109
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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