John McMahon, D.O.
Emergency Medicine Physician · Philadelphia, PA
John McMahon, D.O. is an emergency medicine physician with a practice address in Philadelphia, Pennsylvania, and NPI 1780842898, issued on May 26, 2008. Check the license (Pennsylvania OS015565, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John McMahon
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- OS015565 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3998 Red Lion RD, Philadelphia, PA 19114
- Phone
- (215) 612-4963
- Enumerated
- May 26, 2008
- Record last updated
- Jul 18, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 3,911 in Pennsylvania → Look up another NPI →
Also registered at 3998 Red Lion RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jamie Adamski, D.O.Emergency Medicine Physician1902003528
- Randall Ancharski, PACSurgical Physician Assistant1811035991
- Joseph Arcieri, CRNPAdult Health Nurse Practitioner1144563636
- Neeja Bakshi, D.O.Internal Medicine Physician1760668024
- Halfdan Bau-Madsen, D.O.Emergency Medicine Physician1235334616
- Barry Benner, CRNACertified Registered Nurse Anesthetist1710905013
Verify John McMahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS015565Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average emergency medicine physician in 2024
82 Medicare Part D claims for 53 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone11 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.
Industry payments in 2024: $51.63
2 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John McMahon among 3,911 emergency medicine physician records in Pennsylvania
John McMahon, D.O. is one of 3,911 emergency medicine physician records with a practice address in Pennsylvania. 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 2008, is newer than 38% of them.
- NPI issued2008 · 38% of these records are older, 57% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2019 · 51% 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,006 emergency medicine physician records list a practice address in Philadelphia
They are 1,006 of the 42,849 NPPES records with a practice address in Philadelphia, and 3,911 emergency medicine physician records in Pennsylvania.
All 3,911 in Pennsylvania → Every provider in Philadelphia → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Robert Beyer, D.O.Philadelphia, PA 191141538275326
- James Duncklee, D.O.Philadelphia, PA 191141225053317
- Harold Gauthier, M.D.Philadelphia, PA 191141508899428
- Michael Goodyear, D.O.Philadelphia, PA 191141073538740
- Michael Hennelly, D.O.Philadelphia, PA 191141164441069
- George Hobbib, M.D.Philadelphia, PA 191141609809318
- Jack Levin, M.D.Philadelphia, PA 191141376561381
- Richard McCollum, M.D.Philadelphia, PA 191141659302289
Common questions
What is John McMahon, D.O.'s NPI number?
John McMahon, D.O.'s National Provider Identifier (NPI) is 1780842898, issued on May 26, 2008. An NPI identifies a provider in billing; it is not a license.
Where is John McMahon, D.O. located?
The NPPES record lists a practice address at 3998 Red Lion RD, Philadelphia, PA, 19114. Phone: (215) 612-4963. Providers update this record themselves, so call before visiting.
How can I verify John McMahon, D.O.'s license?
NPPES lists Pennsylvania license number OS015565, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John McMahon, D.O. prescribe under Medicare Part D?
In 2024, John McMahon, D.O. had 82 Medicare Part D claims for 53 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.