John A. Gelzhiser, M.D.
NPI 1013100759ActiveIndividual· Internal Medicine· Warwick, RI
Internal Medicine (M.D.) with Affinity Physicians LLC., practicing in Warwick, Rhode Island. Their prescriptions cost Medicare Part D more than their services did: $1,261,264 for 18,493 claims, against $81,169 paid for services in 2024. Lists Kent County Memorial Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1013100759 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 27, 2007 |
| Last updated in NPPES | Aug 27, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | PENDING | RI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (RI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 364 |
|---|---|
| Services billed | 805 across 6 procedure codes |
| Paid by Medicare | $81,169 |
Part D prescriptions in 2024
| Prescriptions (claims) | 18,493 · 18,510 30-day fills |
|---|---|
| Patients | 711 |
| Total drug cost | $1,261,264 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Affinity Physicians LLC.Warwick, RI · 730 clinicians
Hospital affiliations
- Kent County Memorial HospitalWarwick, RI
- South County Hospital IncWakefield, RI
Other facilities
- Beacon Hospice , An Amedisys CompanyHospice · East Providence, RI
- Eden Hospice LLCHospice · Warwick, RI
- Harmony Hospice Care LLCHospice · Warwick, RI
- Hopehealth Hospice & Palliative CareHospice · Providence, RI
- Vna of Care New EnglandHospice · Warwick, RI
- Bayview Rehabilitation and Healthcare CenterNursing home · North Kingstown, RI
- Brentwood Health CenterNursing home · Warwick, RI
- Sunny View Nursing HomeNursing home · Warwick, RI
- West View Nursing Home, IncNursing home · West Warwick, RI
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 138 internal medicine physicians in Warwick · All internal medicine physicians in Rhode Island