Jan Karczewski, M.D.
NPI 1902291099 · Rheumatology Physician · Warwick, RI
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jan Karczewski, M.D. is a Rheumatology Physician provider in Warwick, RI (NPI 1902291099).
Provider details
- NPI number
- 1902291099
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD17104 (RI)
Specialties & taxonomies
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
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
250 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 | 149 | $95 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 68 | $65 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 33 | $132 |
Typical Medicare-allowed amounts for these services range $65–$132 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 366 | 76 |
| Hydroxychloroquine Sulfate | 304 | 79 |
| Prednisone | 264 | 84 |
| Allopurinol | 170 | 48 |
| Alendronate Sodium | 131 | 41 |
| Leflunomide | 105 | 29 |
| Etanerceptbrand: Enbrel Sureclick | 103 |
Practice location
Mailing address
Additional practice locations (2)
- 111 Brewster StPawtucket, RI 02860-4400Phone: (401) 681-2858
- 101 Dudley StProvidence, RI 02905-2401Phone: (401) 453-7950Fax: (401) 453-7658
Registry dates
- Enumerated
- 2015-04-06
- Last updated
- 2024-07-12
- Certified
- 2024-07-12
Frequently asked questions
- What is Jan Karczewski's NPI number?
- Jan Karczewski's National Provider Identifier (NPI) is 1902291099, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jan Karczewski's specialty?
- Jan Karczewski is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Jan Karczewski located?
- Jan Karczewski's practice location on file with NPPES is 455 Toll Gate Rd, Warwick, RI 02886-2759.
- What is Jan Karczewski's phone number?
- The practice phone number listed in the NPPES registry for Jan Karczewski is (401) 681-2858.
- Does Jan Karczewski accept Medicare?
- Jan Karczewski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jan Karczewski's NPI active?
- Yes — Jan Karczewski's NPI (1902291099) is active in the NPPES registry as of the last update on 2024-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.