Maureen Anne McMahon, MD
NPI 1285655852ActiveIndividual· Internal Medicine, Rheumatology· Los Angeles, CA
Internal Medicine, Rheumatology (MD) in Los Angeles, California, trained at University of Chicago, Pritzker School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $672,979 for 695 claims, against $15,120 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 5 companies reporting payments in 2025, $81,132 in all, mostly speaking and faculty fees.
Overview
| NPI | 1285655852 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 21, 2006 |
| Last updated in NPPES | Jul 13, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | A75412 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Rheumatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 78 |
|---|---|
| Services billed | 512 across 17 procedure codes |
| Paid by Medicare | $15,120 |
Part D prescriptions in 2024
| Prescriptions (claims) | 695 · 1,085 30-day fills |
|---|---|
| Patients | 63 |
| Total drug cost | $672,979 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
Hospital affiliations
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA
Industry payments (Open Payments)
- 2025$81,132 · 64 payments from 5 companies
- 2024$46,882 · 33 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $45,046 | 23 |
| Astrazeneca Pharmaceuticals LP | $25,552 | 30 |
| Genentech, Inc. | $5,250 | 5 |
| Aurinia Pharma U.S., Inc. | $5,191 | 5 |
| Novartis Pharmaceuticals Corporation | $93.16 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$54,750 · 22 payments
- Consulting Fee$15,976 · 9 payments
- Travel and Lodging$8,850 · 14 payments
- Food and Beverage$1,557 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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