Maureen McMahon, MD
Rheumatology · Los Angeles, CANPI 1285655852
Payments from drug & device makers
Across 332 payments — averaging $3379.45 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Novartis$348K
- GSK$259K
- E.r. Squibb & Sons, L.L.C.$178K
- AstraZeneca$122K
- Amgen$82K
- Astrazeneca UK Limited$47K
- plus $85K from 4 others
Across 9 payments — averaging $1117.22 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Genentech, Inc.$10K
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Novartis | 11 | $348,480 |
| GSK | 130 | $259,196 |
| E.r. Squibb & Sons, L.L.C. | 10 | $177,718 |
| AstraZeneca | 103 | $121,989 |
| Amgen | 11 | $81,964 |
| Astrazeneca UK Limited | 10 | $47,363 |
| Sanofi US Services Inc. | 10 | $28,256 |
| Aurinia Pharma U.S., Inc. | 28 | $27,114 |
| Eli Lilly | 12 | $22,570 |
| Genentech, Inc. | 7 | $7,330 |
How this compares
$1,121,979 in reported general payments places this provider in the 95th percentile of 808 rheumatology providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Other rheumatology in Los Angeles
- Christina Charles-SchoemanLos Angeles$4.8M
- Elizabeth VolkmannLos Angeles$1.3M
- Karina Marianne TorralbaLos Angeles$633K
- Suzanne KafajaLos Angeles$589K
- Haoling WengLos Angeles$562K
- Veena RanganathLos Angeles$532K
- Glenn EhresmannLos Angeles$450K
- Samy MetyasCovina$12.9M
- Christine ThaiHuntington Beach$8.5M
- Tien-I SuWhittier$8.4M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.