Peter Stephen Antkowiak, M.D.
Emergency Medicine Physician · Springfield, MA
Peter Stephen Antkowiak, M.D. is an emergency medicine physician with a practice address in Springfield, Massachusetts, and NPI 1700249273, issued on Apr 1, 2016. Check the license (Massachusetts 277924, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Peter Stephen Antkowiak
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 277924 MA
Self-reported in NPPES; status is on the state search - Practice location
- 759 Chestnut Street, Springfield, MA 01107
- Phone
- (413) 794-3233
- Enumerated
- Apr 1, 2016
- Record last updated
- Sep 19, 2024
- Fax
- (413) 794-9060
- Medicare enrollment
- Enrolled (PECOS I20190628000111); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 2016
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,829 in Massachusetts → Look up another NPI →
Also registered at 759 Chestnut Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Inna Baraban, PA-CSurgical Physician Assistant1609326552
- Oscar Barnes Valldejuly, MDEmergency Medicine Physician1770115073
Verify Peter Stephen Antkowiak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 277924Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average emergency medicine physician in 2024
111 Medicare Part D claims for 90 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cefpodoxime Proxetil18 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 one group practice
- Baystate Medical Practices IncSpringfield, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter Stephen Antkowiak among 1,829 emergency medicine physician records in Massachusetts
Peter Stephen Antkowiak, M.D. is one of 1,829 emergency medicine physician records with a practice address in Massachusetts. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 73% of them.
- NPI issued2016 · 73% of these records are older, 23% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2016 · median 2011 among the 1,200 with a school on file
- Record last updated2024 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
123 emergency medicine physician records list a practice address in Springfield
They are 123 of the 8,553 NPPES records with a practice address in Springfield, and 1,829 emergency medicine physician records in Massachusetts.
All 1,829 in Massachusetts → Every provider in Springfield → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Vanna Albert, MDSpringfield, MA 011071548680952
- Rebecca Barron, M.D.Springfield, MA 011071811280027
- Ryan Clark, D.O.Springfield, MA 011071699160374
- Seth Gemme, M.D.Springfield, MA 011071174883110
- Dersim Kaya, MDSpringfield, MA 011071780090654
- Agnieszka Nicora, MDSpringfield, MA 011071003080151
- Erica Ogle, D.O.Springfield, MA 011071962847459
- Matthew Opacic, MDSpringfield, MA 011071023285517
Common questions
What is Peter Stephen Antkowiak, M.D.'s NPI number?
Peter Stephen Antkowiak, M.D.'s National Provider Identifier (NPI) is 1700249273, issued on Apr 1, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Peter Stephen Antkowiak, M.D. located?
The NPPES record lists a practice address at 759 Chestnut Street, Springfield, MA, 01107. Phone: (413) 794-3233. Providers update this record themselves, so call before visiting.
How can I verify Peter Stephen Antkowiak, M.D.'s license?
NPPES lists Massachusetts license number 277924, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Peter Stephen Antkowiak, M.D. prescribe under Medicare Part D?
In 2024, Peter Stephen Antkowiak, M.D. had 111 Medicare Part D claims for 90 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.