Jan M. Karczewski, M.D.
NPI 1902291099ActiveIndividual· Internal Medicine, Rheumatology· Warwick, RI
Internal Medicine, Rheumatology (M.D.) with Affinity Physicians LLC., practicing in Warwick, Rhode Island. Their prescriptions cost Medicare Part D more than their services did: $2,355,646 for 2,483 claims, against $17,388 paid for services in 2024. Lists Kent County Memorial Hospital and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1902291099 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 6, 2015 |
| Last updated in NPPES | Jul 12, 2024 |
| Certified by provider | Jul 12, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | MD17104 | 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 - Rheumatology (RI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 144 |
|---|---|
| Services billed | 273 across 11 procedure codes |
| Paid by Medicare | $17,388 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,483 · 4,152 30-day fills |
|---|---|
| Patients | 364 |
| Total drug cost | $2,355,646 |
| Generic share | 83% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Rheumatology |
Medical group
- Affinity Physicians LLC.Warwick, RI · 730 clinicians
Hospital affiliations
- Kent County Memorial HospitalWarwick, RI
- South County Hospital IncWakefield, RI
- The Miriam HospitalProvidence, RI
- Women & Infants Hospital of Rhode IslandProvidence, 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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