Stephen Mcmahon, MD
NPI 1225098957 · Internal Medicine Physician · Kaufman, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Mcmahon, MD is a Internal Medicine Physician provider in Kaufman, TX (NPI 1225098957).
Provider details
- NPI number
- 1225098957
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- E6514 (TX)
Specialties & taxonomies
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
418 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 | 237 | $74 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 138 | $109 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 43 | $124 |
Typical Medicare-allowed amounts for these services range $74–$124 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefuroxime Axetilbrand: Cefuroxime | 47 | 45 |
| Methylprednisolone | 39 | 34 |
| Potassium Chloride | 32 | 26 |
| Levofloxacin | 31 | 30 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 23 | 22 |
| Furosemide | 22 | 13 |
| Apixabanbrand: Eliquis | 17 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-25
- Last updated
- 2020-12-23
- Certified
- 2020-12-23
Frequently asked questions
- What is Stephen Mcmahon's NPI number?
- Stephen Mcmahon's National Provider Identifier (NPI) is 1225098957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Mcmahon's specialty?
- Stephen Mcmahon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Mcmahon located?
- Stephen Mcmahon's practice location on file with NPPES is 850 Ed Hall Dr, Kaufman, TX 75142-1861.
- What is Stephen Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Stephen Mcmahon is (972) 932-7349.
- Does Stephen Mcmahon accept Medicare?
- Stephen Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Mcmahon's NPI active?
- Yes — Stephen Mcmahon's NPI (1225098957) is active in the NPPES registry as of the last update on 2020-12-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.