Quick answers
- Does Joseph V. Zwirko accept Medicare assignment?
- Yes. Medicare's clinician data says Joseph V. Zwirko 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 Joseph V. Zwirko see?
- In 2024, CMS data shows 700 Original Medicare patients and 8,341 services for Joseph V. Zwirko. This counts Original Medicare only and measures volume, not quality.
- What is Joseph V. Zwirko's NPI number?
- 1346403037. 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 Joseph V. Zwirko, 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 | 700 |
|---|---|
| Services billed to Medicare | 8,341 |
| Different services or procedures | 57 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)4,055 services
- Aspiration and/or injection of fluid from large joint (20610)655 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)183 services
- X-ray of hip, 2-3 views (73502)174 services
- X-ray of knee, 4 or more views (73564)168 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%
- Arthritis75%
- Anxiety29%
- Depression26%
- Ischemic heart disease25%
Practice locations
Addresses where Joseph V. Zwirko is enrolled with Medicare (CMS data updated October 2, 2026).
- 35 Post Office Park, Suite 6Wilbraham, MA 01095 (413) 836‑7846
- 53 Southampton RdWestfield, MA 01085 (413) 335‑2606
Group practices
Medicare enrollment lists Joseph V. Zwirko as a member of this group (CMS data updated October 2, 2026).
- Ortho Ma LLC19 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Wilbraham
Clinicians with the same Medicare primary specialty in Wilbraham, MA — not a recommendation.
Other clinicians in Ortho Ma LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346403037 |
| 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