Ashwin Ananthakrishnan
Gastroenterology · Boston, MANPI 1033292545
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (58.7%), consulting fees and food and beverage — rather than concentrated in one kind of arrangement. Pfizer accounts for 66.8% of it on its own, with 6 other manufacturers making up the rest. Reporting peaked in 2021 at $7,663 and has fallen 98.1% since, to $146 in 2024.
Across 14 payments — averaging $1150.22 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Pfizer$11K
- Takeda Pharmaceuticals U.S.A., Inc.$3K
- Gilead$1K
- AbbVie$617
- Biogen$300
- Conmed Corporation$116
- plus $25 from 1 others
Across 263 payments — averaging $2937.40 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.
- Takeda Pharmaceuticals U.S.A., Inc.$517K
- AbbVie$97K
- Gilead$84K
- Pfizer$33K
- Shire North American Group Inc$25K
- Genentech, Inc.$17K
What the payments were for
- Consulting fees$6,39140%
- Speaking & faculty fees$9,45059%
- Food & beverage$2071%
- Education$550%
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 |
|---|---|---|
| Pfizer | 5 | $10,749 |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $3,086 |
| Gilead | 1 | $1,210 |
| AbbVie | 2 | $617 |
| Biogen | 2 | $300 |
| Conmed Corporation | 1 | $116 |
| Intercept Pharmaceuticals, Inc. | 1 | $25 |
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
$16,103 in reported general payments places this provider in the 85th percentile of 579 gastroenterology providers in Massachusetts.
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 |
|---|---|---|
| StelaraUstekinumab | 125 | $3,307,428 |
| GattexTeduglutide | 26 | $1,207,466 |
| Humira(Cf) PenAdalimumab | 70 | $601,235 |
| Yuflyma(Cf) Autoinject (2 Pck)Adalimumab-Aaty | 28 | $257,787 |
| Skyrizi On-BodyRisankizumab-Rzaa | 12 | $247,166 |
| RinvoqUpadacitinib | 24 | $223,311 |
| Humira PenAdalimumab | 18 | $206,304 |
| XeljanzTofacitinib Citrate | 24 | $131,210 |
| EntyvioVedolizumab | 11 | $95,339 |
| HumiraAdalimumab | 13 | $88,550 |
| Cimzia (2 Pack)Certolizumab Pegol | 15 | $87,008 |
| Mesalamine | 81 | $71,449 |
| Entyvio PenVedolizumab | 11 | $68,236 |
| RemicadeInfliximab | 13 | $59,347 |
| XifaxanRifaximin | 14 | $47,097 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc.Gattex, Entyvio, Motegrity | $3,086 | $1,316,35458 claims |
| AbbVieRinvoq, Humira, Creon, Linzess | $617 | $347,91570 claims |
| PfizerXeljanz | $10,749 | $131,21024 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 85th percentile of 579 gastroenterology providers in Massachusetts.
Other gastroenterology in Boston
- Hiroyuki AiharaBoston$728K
- Jessica AllegrettiBoston$696K
- John LeungBoston$682K
- Ramnik XavierBoston$567K
- Adam CheifetzBoston$512K
- Carlo TraversoBoston$447K
- Tyler BerzinBoston$215K
- Marvin RyouBoston$162K
- Nneka UfereBoston$153K
- Christopher ThompsonBoston$127K
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.