Stephen R. McMahon, MD
Internal Medicine Physician · Kaufman, TX
Stephen R. McMahon, MD is an internal medicine physician with a practice address in Kaufman, Texas, and NPI 1225098957, issued on Mar 25, 2006. Check the license (Texas E6514, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Stephen R. McMahon
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- E6514 TX
Self-reported in NPPES; status is on the state search - Practice location
- 850 ED Hall Dr, Kaufman, TX 75142
- Phone
- (972) 932-7349
- Enumerated
- Mar 25, 2006
- Record last updated
- Dec 23, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (972) 932-7273
- Medicaid IDs
- 156329802 TX
156329801 TX - Medicare enrollment
- Enrolled (PECOS I20090325000521); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 1976
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 850 ED Hall Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Olubunmi Akharume, M.D.Internal Medicine Physician1417693557
- Steven Altshuler, M.D.Diagnostic Radiology Physician1336117662
- Darren Garner, MDEmergency Medicine Physician1700447323
- Duhwan Kang, M.D.Internal Medicine Physician1922430685
- Andrea Lucas, APRNAcute Care Nurse Practitioner1417652215
- Asif Masood, MDFamily Medicine Physician1194715656
Verify Stephen R. McMahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license E6514Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
366 Medicare Part D claims for 161 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 16 claims were for opioids.
Most prescribed
- Cefuroxime47 claims
- Methylprednisolone39 claims
- Potassium Chloride32 claims
- Levofloxacin31 claims
- Amoxicillin-Clavulanate Potass23 claims
- Furosemide22 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 practice group's MIPS final score for 2023 (Medicare payment program): 75.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Texas Health Physicians GroupKaufman, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen R. McMahon among 9,175 internal medicine physician records in Texas
Stephen R. McMahon, MD is one of 9,175 internal medicine physician records with a practice address in Texas. 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1976 · median 2004 among the 6,088 with a school on file
- Record last updated2020 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 internal medicine physician records list a practice address in Kaufman
They are 9 of the 154 NPPES records with a practice address in Kaufman, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Kaufman → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Olubunmi Akharume, M.D.Kaufman, TX 751421417693557
- Anantha Chentha, M.DKaufman, TX 751421245648195
- Garry Guce, M.D.Kaufman, TX 751421821318809
- Duhwan Kang, M.D.Kaufman, TX 751421922430685
- Prabha Mohan, M.D.Kaufman, TX 751421548362098
- Precious Ndukwe, MDKaufman, TX 751421063153310
- Mark Sij, D.O.Kaufman, TX 751421396705919
- Sara Zaleta, M.D.Kaufman, TX 751421336106913
Common questions
What is Stephen R. McMahon, MD's NPI number?
Stephen R. McMahon, MD's National Provider Identifier (NPI) is 1225098957, issued on Mar 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen R. McMahon, MD located?
The NPPES record lists a practice address at 850 ED Hall Dr, Kaufman, TX, 75142. Phone: (972) 932-7349. Providers update this record themselves, so call before visiting.
How can I verify Stephen R. McMahon, MD's license?
NPPES lists Texas license number E6514, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen R. McMahon, MD prescribe under Medicare Part D?
In 2024, Stephen R. McMahon, MD had 366 Medicare Part D claims for 161 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Stephen R. McMahon, MD's MIPS final score?
The 2023 MIPS final score is 75.3 of 100, reported for the practice group. 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.