Reflects CMS Open Payments as of 2026-07-26T04:22:22Z. CMS updates this data on an annual cycle, and corrections or successful disputes made at CMS may not yet appear here. The official CMS record is authoritative for the current state. View the official CMS record ↗
Covered recipient · General Payments record
MATTHEW M MCMAHON
Allopathic & Osteopathic Physicians Internal Medicine Gastroenterology
A name match is not confirmation of identity. CMS publishes records for different people under similar names; the NPI, specialty, and location shown on this page are the CMS-published fields that distinguish them.
General Payments · PY2019–2025
- CMS publication 2026-06-30
“Financial relationships do not necessarily indicate an improper relationship; the data is open to interpretation.”
— Centers for Medicare & Medicaid Services, Open Payments
A reported payment reflects a financial relationship a company disclosed. It does not indicate wrongdoing or a conflict of interest, and it says nothing about the quality of a provider's care.
These records are submitted to CMS and attested to by the reporting companies. CMS publishes them as reported; this site mirrors them without independent verification.
A payment attributed to a provider may have been made to a third party — a hospital, practice, or research institution — rather than paid to the provider personally.
How these totals are calculated
- This total is the sum of the individual General Payments record amounts CMS published for the labeled program year(s); each record amount is used unmodified. The total itself is computed by this site. Nothing is estimated, weighted, or combined across categories.
- General Payments only. Research and Ownership/Investment are separate datasets and are never summed with these figures; amounts are kept separate per program year.
- Featured-page threshold (a presentation gate, not a judgment): (records>=3 OR total>=100) AND records>=2 AND NPI identity (all years).
- Methodology & Data — sourcing, labeling, and limitations.
By nature of payment
PY2025 · sorted by reported total
| Nature of payment | Amount | Records |
|---|---|---|
| Food and Beverage | $1,391.92 | 87 |
| Education | $30.20 | 3 |
By paying entity
PY2025 · sorted by reported total
| Paying entity | Amount | Records |
|---|---|---|
| Janssen Biotech, Inc. | $355.38 | 27 |
| ABBVIE INC. | $306.35 | 22 |
| Madrigal Pharmaceuticals | $207.47 | 11 |
| GENZYME CORPORATION | $93.70 | 4 |
| Regeneron Healthcare Solutions, Inc. | $90.34 | 4 |
| Takeda Pharmaceuticals U.S.A., Inc. | $83.93 | 4 |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | $56.73 | 3 |
| Ardelyx, Inc. | $41.02 | 2 |
| Lilly USA, LLC | $35.71 | 2 |
| Gilead Sciences, Inc. | $34.23 | 1 |
| Celltrion USA Inc. | $32.08 | 2 |
| Phathom Pharmaceuticals, Inc. | $31.43 | 4 |
| Janssen Pharmaceuticals, Inc | $30.20 | 3 |
| Amgen Inc. | $23.55 | 1 |
By program year
All program years on this page · sorted by year
Payment records · PY2025 (90)
Ordering applied by this site (date, newest first, then paying entity) · record values are shown as CMS published them
Source & provenance
- Dataset
- CMS Open Payments — General Payments
- Publisher of source data
- Centers for Medicare & Medicaid Services
- CMS publication date
- 2026-06-30
- Program years on this page
- 2019, 2020, 2021, 2022, 2023, 2024, 2025
- Source files
- Dataset page · Bulk file · PY2019 , PY2020 , PY2021 , PY2022 , PY2023 , PY2024 , PY2025
- Generated from
- OP_DTL_GNRL_PGYR2025_P06302026_06032026.csv
One page per canonical provider; split Profile_IDs are merged via Associated_Covered_Recipient_Profile_ID_1/_2 from the Covered Recipient Profile Supplement.
Corrections to the substance of a record route to CMS through its review-and-dispute process; errors in how this site mirrors or displays a record route to us. Both paths are described in Methodology & Data.
Cite this record.
Permalink https://industrypayments.org/provider/npi-1528244845
- Plain
- MATTHEW M MCMAHON, NPI 1528244845. IndustryPayments, data edition 2026-07-26T04:22:22Z. https://industrypayments.org/provider/npi-1528244845.
- APA 7
- IndustryPayments. (2026). MATTHEW M MCMAHON, NPI 1528244845 (Data edition 2026-07-26T04:22:22Z) [Data set]. https://industrypayments.org/provider/npi-1528244845
- Bluebook
- MATTHEW M MCMAHON, NPI 1528244845, IndustryPayments (data edition 2026-07-26T04:22:22Z), https://industrypayments.org/provider/npi-1528244845.
Source: Centers for Medicare & Medicaid Services, Open Payments.