Quick answers
- Does Claire R. Trefethen accept Medicare assignment?
- Yes. Medicare's clinician data says Claire R. Trefethen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Claire R. Trefethen see?
- In 2024, CMS data shows 28 Original Medicare patients and 1,439 services for Claire R. Trefethen. This counts Original Medicare only and measures volume, not quality.
- What is Claire R. Trefethen's NPI number?
- 1740950138. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Claire R. Trefethen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 28 |
|---|---|
| Services billed to Medicare | 1,439 |
| Different services or procedures | 6 |
| Participating Medicare provider | Yes |
| Average age of these patients | 80 |
Most frequent services
- Therapy procedure using exercise to develop strength, endurance, range of motion, and flexibility, each 15 minutes (97110)543 services
- Therapy procedure using functional activities (97530)410 services
- Training for self-care or home management, each 15 minutes (97535)194 services
- Therapy procedure using manual technique, each 15 minutes (97140)155 services
- Therapy procedure to re-educate brain-to-nerve-to-muscle function, each 15 minutes (97112)116 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure68%
- Arthritis64%
- Osteoporosis39%
Practice locations
Addresses where Claire R. Trefethen is enrolled with Medicare (CMS data updated October 2, 2026).
- 41 Clark StBrooklyn, NY 11201 (646) 518‑5566
- 99 University Pl, Fl 9New York, NY 10003 (212) 604‑1316
Group practices
Medicare enrollment lists Claire R. Trefethen as a member of these groups (CMS data updated October 2, 2026).
- Spear Physical and Occupational Therapy, LLC593 clinicians in the group
- Lisa Blum Physical Therapy PLLC9 clinicians in the group
Specialties
Find other clinicians: Occupational Therapist in Private Practice, New York →
Other occupational therapists in Brooklyn
Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.
Other clinicians in Spear Physical and Occupational Therapy, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OT |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740950138 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians