Quick answers
- Does Diana R. Diem accept Medicare assignment?
- Yes. Medicare's clinician data says Diana R. Diem 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 Diana R. Diem see?
- In 2024, CMS data shows 187 Original Medicare patients and 2,487 services for Diana R. Diem. This counts Original Medicare only and measures volume, not quality.
- What is Diana R. Diem's NPI number?
- 1003520917. 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 Diana R. Diem, 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 | 187 |
|---|---|
| Services billed to Medicare | 2,487 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Therapy procedure using functional activities (97530)581 services
- Therapy procedure to re-educate brain-to-nerve-to-muscle function, each 15 minutes (97112)554 services
- Therapy procedure using manual technique, each 15 minutes (97140)545 services
- Therapy procedure using exercise to develop strength, endurance, range of motion, and flexibility, each 15 minutes (97110)498 services
- Therapy procedure in a group setting (97150)163 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 blood pressure75%
- High cholesterol75%
- Arthritis74%
- Ischemic heart disease33%
- Diabetes32%
- Anxiety32%
Practice locations
Addresses where Diana R. Diem is enrolled with Medicare (CMS data updated October 2, 2026).
- 2142 Utopia PkwyWhitestone, NY 11357 (718) 767‑0610
- 800 Veterans Memorial HwyHauppauge, NY 11788
Group practices
Medicare enrollment lists Diana R. Diem as a member of this group (CMS data updated October 2, 2026).
- Professional Occupational and Physical Therapy, PLLC495 clinicians in the group
Specialties
Find other clinicians: Occupational Therapist in Private Practice, New York →
Other occupational therapists in Whitestone
Clinicians with the same Medicare primary specialty in Whitestone, NY — not a recommendation.
Other clinicians in Professional Occupational and Physical Therapy, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2023 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1003520917 |
| 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