Donald James McMahon, D.O.
Gastroenterology Physician · Turnersville, NJ
Donald James McMahon, D.O. is a gastroenterology physician with a practice address in Turnersville, New Jersey, and NPI 1285824839, issued on Jul 30, 2007. Check the license (New Jersey 25MB0862200, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Donald James McMahon
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 25MB0862200 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 188 Fries Mill RD, Turnersville, NJ 08012
- Phone
- (856) 783-2241
- Enumerated
- Jul 30, 2007
- Record last updated
- Jan 19, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (856) 783-2243
- Medicaid ID
- 0232793 NJ
- Medicare enrollment
- Enrolled (PECOS I20100907000611); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2004
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 735 in New Jersey → Look up another NPI →
Also registered at 188 Fries Mill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Altman, M.D.Internal Medicine Physician1619918828
- Amy Barker, APNFamily Nurse Practitioner1174986541
- Paul Berlin, M.D.Allergy & Immunology Physician1346244282
- Kathleen Bickel, D.M.D.Dentist1457796856
- Matthew Bickel, D.M.D.Dentist1972948362
- Edward Bierman, M.D.Pediatrics Physician1043280928
Verify Donald James McMahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MB0862200Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average gastroenterology physician in 2024
555 Medicare Part D claims for 142 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Omeprazole84 claims
- Famotidine76 claims
- Pantoprazole Sodium43 claims
- Dicyclomine Hcl40 claims
- Linzess38 claims
- Esomeprazole Magnesium21 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.
The MIPS final score for 2023 (Medicare payment program): 99.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cooper Care Alliance, PCTurnersville, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Donald James McMahon among 735 gastroenterology physician records in New Jersey
Donald James McMahon, D.O. is one of 735 gastroenterology physician records with a practice address in New Jersey. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 56% of them.
- NPI issued2007 · 56% of these records are older, 35% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2004 · median 2000 among the 564 with a school on file
- Record last updated2017 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 gastroenterology physician records list a practice address in Turnersville
They are 7 of the 431 NPPES records with a practice address in Turnersville, and 735 gastroenterology physician records in New Jersey.
All 735 in New Jersey → Every provider in Turnersville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- John Chiesa, DOTurnersville, NJ 080121649348582
- Drew ChiesaTurnersville, NJ 080121689812505
- C. Jonathan Foster, D.O,Turnersville, NJ 080121598052748
- Lucy Joo, DOTurnersville, NJ 080121669813804
- Nikhitha Mantri, MDTurnersville, NJ 080121720505431
- Richard Walters, DOTurnersville, NJ 080121982856928
- Raman Battish, M.D.Cherry Hill, NJ 080031770791923
- Daniel Brandt, M.D.Cherry Hill, NJ 080031700221603
Common questions
What is Donald James McMahon, D.O.'s NPI number?
Donald James McMahon, D.O.'s National Provider Identifier (NPI) is 1285824839, issued on Jul 30, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Donald James McMahon, D.O. located?
The NPPES record lists a practice address at 188 Fries Mill RD, Turnersville, NJ, 08012. Phone: (856) 783-2241. Providers update this record themselves, so call before visiting.
How can I verify Donald James McMahon, D.O.'s license?
NPPES lists New Jersey license number 25MB0862200, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Donald James McMahon, D.O. prescribe under Medicare Part D?
In 2024, Donald James McMahon, D.O. had 555 Medicare Part D claims for 142 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Donald James McMahon, D.O.'s MIPS final score?
The 2023 MIPS final score is 99.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.