Donald Mcmahon, D.O.
NPI 1285824839 · Gastroenterology Physician · Turnersville, NJ
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Donald Mcmahon, D.O. is a Gastroenterology Physician provider in Turnersville, NJ (NPI 1285824839).
Provider details
- NPI number
- 1285824839
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
293 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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 121 | $123 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 36 | $98 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 31 | $202 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 27 | $272 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 23 | $220 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
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 |
|---|---|---|
| Omeprazole | 84 | 20 |
| Famotidine | 76 | 28 |
| Pantoprazole Sodium | 43 | 13 |
| Dicyclomine Hcl | 40 | 17 |
| Linaclotidebrand: Linzess | 38 | — |
| Ondansetronbrand: Ondansetron Odt | 21 | — |
| Esomeprazole Magnesium | 21 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-30
- Last updated
- 2017-01-19
Frequently asked questions
- What is Donald Mcmahon's NPI number?
- Donald Mcmahon's National Provider Identifier (NPI) is 1285824839, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Mcmahon's specialty?
- Donald Mcmahon is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Donald Mcmahon located?
- Donald Mcmahon's practice location on file with NPPES is 188 Fries Mill Rd, Turnersville, NJ 08012-2015.
- What is Donald Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Donald Mcmahon is (856) 783-2241.
- Does Donald Mcmahon accept Medicare?
- Donald Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Donald Mcmahon's NPI active?
- Yes — Donald Mcmahon's NPI (1285824839) is active in the NPPES registry as of the last update on 2017-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.