Joseph Zwirko, PA-C
NPI 1346403037 · Physician Assistant · Springfield, MA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Zwirko, PA-C is a Physician Assistant provider in Springfield, MA (NPI 1346403037).
Provider details
- NPI number
- 1346403037
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 2557 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,963 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) |
|---|---|---|
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 655 | $64 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 183 | $78 |
| X-Ray of Hip, 2-3 Views73502 | 174 | $22 |
| X-Ray of Knee, 4 Or More Views73564 | 168 | $26 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 130 | $111 |
| X-Ray of Knee, 3 Views73562 | 125 | $21 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 257 | 128 |
| Tramadol Hcl | 181 | 60 |
| Diclofenac Sodium | 117 | 56 |
| Tizanidine Hcl | 66 | 40 |
| Oxycodone Hcl | 46 | 42 |
| Amoxicillin | 31 | 21 |
| Methylprednisolone | 28 | 28 |
| Celecoxib | 25 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-07-03
- Last updated
- 2023-11-15
- Certified
- 2023-11-15
Frequently asked questions
- What is Joseph Zwirko's NPI number?
- Joseph Zwirko's National Provider Identifier (NPI) is 1346403037, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Zwirko's specialty?
- Joseph Zwirko is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Joseph Zwirko located?
- Joseph Zwirko's practice location on file with NPPES is 300 Birnie Ave, Springfield, MA 01107-1107.
- What is Joseph Zwirko's phone number?
- The practice phone number listed in the NPPES registry for Joseph Zwirko is (413) 785-4666.
- Does Joseph Zwirko accept Medicare?
- Joseph Zwirko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Zwirko's NPI active?
- Yes — Joseph Zwirko's NPI (1346403037) is active in the NPPES registry as of the last update on 2023-11-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.