Gregory Haman, M.D.
NPI 1033590773 · Internal Medicine Physician · Willimantic, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Haman, M.D. is a Internal Medicine Physician provider in Willimantic, CT (NPI 1033590773).
Provider details
- NPI number
- 1033590773
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 125066888 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
969 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 485 | $139 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 135 | $143 |
| Hemoglobin A1c Level83036 | 79 | $10 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 76 | $98 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 52 | $18 |
| Administration of Influenza Virus Vaccine |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 164 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 849 | 259 |
| Amlodipine Besylate | 778 | 227 |
| Losartan Potassium | 434 | 132 |
| Rosuvastatin Calcium | 372 | 116 |
| Metoprolol Succinate | 354 | 102 |
| Hydrochlorothiazide | 334 | 104 |
| Levothyroxine Sodium |
Practice location
Mailing address
Additional practice locations (3)
- 5841 S Maryland AveRoom A700; Mc-7082Chicago, IL 60637-1447Phone: (773) 702-6840
- Cermak Health Services of Cook County2800 South California AvenueChicago, IL 60608-5107Phone: (773) 674-7488
- 5841 S Maryland AveRoom A700; Mc-7082Chicago, IL 60637-1447Phone: (773) 702-6840
Registry dates
- Enumerated
- 2015-06-17
- Last updated
- 2020-05-06
- Certified
- 2020-05-06
Frequently asked questions
- What is Gregory Haman's NPI number?
- Gregory Haman's National Provider Identifier (NPI) is 1033590773, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Haman's specialty?
- Gregory Haman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Haman located?
- Gregory Haman's practice location on file with NPPES is 5 Founders St Ste 100, Willimantic, CT 06226-2049.
- What is Gregory Haman's phone number?
- The practice phone number listed in the NPPES registry for Gregory Haman is (860) 423-9764.
- Does Gregory Haman accept Medicare?
- Gregory Haman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Haman's NPI active?
- Yes — Gregory Haman's NPI (1033590773) is active in the NPPES registry as of the last update on 2020-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.