Joseph Victor Zwirko, PA-C
Physician Assistant · Springfield, MA
Joseph Victor Zwirko, PA-C is a physician assistant with a practice address in Springfield, Massachusetts, and NPI 1346403037, issued on Jul 3, 2008. Check the license (Massachusetts 2557, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Joseph Victor Zwirko
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 2557 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Birnie Ave, Springfield, MA 01107
- Phone
- (413) 785-4666
- Enumerated
- Jul 3, 2008
- Record last updated
- Nov 15, 2023
- Fax
- (413) 846-4756
- Medicare enrollment
- Enrolled (PECOS I20080926000335); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,713 in Massachusetts → Look up another NPI →
Also registered at 300 Birnie Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joseph Victor Zwirko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 2557Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average physician assistant in 2024
841 Medicare Part D claims for 340 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 247 claims were for opioids.
Most prescribed
- Meloxicam257 claims
- Tramadol Hcl181 claims
- Diclofenac Sodium117 claims
- Tizanidine Hcl66 claims
- Oxycodone Hcl46 claims
- Amoxicillin31 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Northeast Orthopaedic Alliance PLLCWestborough, MA
- Ortho MA LLCWilbraham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Victor Zwirko among 4,713 physician assistant records in Massachusetts
Joseph Victor Zwirko, PA-C is one of 4,713 physician assistant records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 18% of them.
- NPI issued2008 · 18% of these records are older, 80% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2008 · median 2019 among the 3,217 with a school on file
- Record last updated2023 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
172 physician assistant records list a practice address in Springfield
They are 172 of the 8,553 NPPES records with a practice address in Springfield, and 4,713 physician assistant records in Massachusetts.
All 4,713 in Massachusetts → Every provider in Springfield → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Tamer Bahgat, PA-CSpringfield, MA 011071013938356
- Henry Casagrande, PA-CSpringfield, MA 011071568485696
- Michael Cavanagh, PA-CSpringfield, MA 011071801817960
- Mark Dutille, PA-CSpringfield, MA 011071447268149
- Alison Johnson, PASpringfield, MA 011071730181355
- Kimberly Mahoney, P.A.Springfield, MA 011071306928148
- Peter Michaud, PASpringfield, MA 011071619980968
- Anika Opp-Harris, PA-CSpringfield, MA 011071134138563
Common questions
What is Joseph Victor Zwirko, PA-C's NPI number?
Joseph Victor Zwirko, PA-C's National Provider Identifier (NPI) is 1346403037, issued on Jul 3, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Victor Zwirko, PA-C located?
The NPPES record lists a practice address at 300 Birnie Ave, Springfield, MA, 01107. Phone: (413) 785-4666. Providers update this record themselves, so call before visiting.
How can I verify Joseph Victor Zwirko, PA-C's license?
NPPES lists Massachusetts license number 2557, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Joseph Victor Zwirko, PA-C prescribe under Medicare Part D?
In 2024, Joseph Victor Zwirko, PA-C had 841 Medicare Part D claims for 340 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.