Michael Mcmahon, M.D.
NPI 1548240641 · Internal Medicine Physician · Nederland, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Mcmahon, M.D. is a Internal Medicine Physician provider in Nederland, TX (NPI 1548240641).
Provider details
- NPI number
- 1548240641
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- K0347 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,087 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 2,204 | $74 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 539 | $70 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 370 | $101 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 263 | $163 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 208 | $111 |
| Hospital Discharge Day Management, More Than 30 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 196 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 639 | 145 |
| Levothyroxine Sodium | 584 | 104 |
| Apixabanbrand: Eliquis | 423 | 91 |
| Pantoprazole Sodium | 379 | 100 |
| Donepezil Hcl | 355 | 54 |
| Furosemide | 332 | 92 |
| Gabapentin | 283 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-17
- Last updated
- 2021-01-06
- Certified
- 2021-01-06
Frequently asked questions
- What is Michael Mcmahon's NPI number?
- Michael Mcmahon's National Provider Identifier (NPI) is 1548240641, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Mcmahon's specialty?
- Michael Mcmahon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Mcmahon located?
- Michael Mcmahon's practice location on file with NPPES is 1003 Nederland Ave, Nederland, TX 77627-2832.
- What is Michael Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Michael Mcmahon is (409) 344-4466.
- Does Michael Mcmahon accept Medicare?
- Michael Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Mcmahon's NPI active?
- Yes — Michael Mcmahon's NPI (1548240641) is active in the NPPES registry as of the last update on 2021-01-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.