Weiming Yan, MD
Gastroenterology · Frederick, MDNPI 1851552624
Payments from drug & device makers
Across 357 payments — averaging $20.89 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$1K
- Takeda Pharmaceuticals U.S.A., Inc.$1K
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$942
- Johnson & Johnson$589
- Bristol Myers Squibb$524
- Pfizer$375
- plus $3K from 23 others
What the payments were for
- Food & beverage$7,26097%
- Education$1993%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| AbbVie | 74 | $1,329 |
| Takeda Pharmaceuticals U.S.A., Inc. | 51 | $1,196 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 62 | $942 |
| Johnson & Johnson(2 entities) | 19 | $589 |
| Bristol Myers Squibb | 33 | $524 |
| Pfizer | 18 | $375 |
| Gilead | 13 | $324 |
| Ardelyx, Inc. | 5 | $209 |
| Daiichi Sankyo Inc. | 7 | $158 |
| Lilly USA, LLC | 8 | $157 |
| Madrigal Pharmaceuticals | 6 | $155 |
| Intercept Pharmaceuticals, Inc. | 7 | $154 |
| Phathom Pharmaceuticals, Inc. | 10 | $149 |
| Fresenius Kabi USA, LLC | 7 | $136 |
| Nestle Healthcare Nutrition Inc. | 5 | $112 |
| Sanofi | 4 | $108 |
| Janssen Scientific Affairs, LLC | 1 | $103 |
| Ferring Pharmaceuticals Inc. | 5 | $103 |
| ARS Pharmaceuticals Operations, Inc. | 1 | $100 |
| Angiodynamics, Inc. | 1 | $95 |
| Boston Scientific | 1 | $88 |
| Regeneron Healthcare Solutions, Inc. | 5 | $87 |
| Ironwood Pharmaceuticals, Inc | 5 | $87 |
| Amgen | 2 | $60 |
| Ipsen Biopharmaceuticals, Inc | 2 | $38 |
| Merck | 2 | $30 |
| Shionogi Inc | 1 | $20 |
| Organon | 1 | $18 |
| AstraZeneca | 1 | $11 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$7,459 in reported general payments places this provider in the 70th percentile of 455 gastroenterology providers in Maryland.
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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Dexlansoprazole DrDexlansoprazole | 16 | $6,475 |
| Esomeprazole Magnesium | 27 | $4,004 |
| Lansoprazole | 20 | $3,934 |
| Pantoprazole Sodium | 157 | $2,503 |
| Colestipol Hcl | 19 | $2,038 |
| Omeprazole | 91 | $1,417 |
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 17 | $980 |
| Famotidine | 72 | $784 |
| Sucralfate | 27 | $661 |
| Dicyclomine Hcl | 27 | $235 |
| Metoclopramide Hcl | 12 | $42 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Frederick
- Natasha KamalFrederick$131K
- Matthew YeatmanFrederick$78K
- Kenolisa OnwuemeBaltimore$4.5M
- Paul ThuluvathBaltimore$3.6M
- Apurva ModiRockville$3.3M
- Louis KormanChevy Chase$1.9M
- Marcia CantoBaltimore$1.6M
- Michael EpsteinAnnapolis$1.4M
- Rudrajit RaiColumbia$1.4M
- Natarajan RavendhranCatonsville$1.2M
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.