Surianarayanan Karthikeyan, MD
Gastroenterology · Fargo, NDNPI 1881725836
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $2,155 of the $2,664 with a category attached, or 80.9%. 14 manufacturers reported payments, led by AbbVie at 25.0% of the total. Reporting peaked in 2022 at $1,177 and has fallen 80.7% since, to $227 in 2025.
Across 124 payments — averaging $21.48 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$667
- Olympus America Inc.$509
- Takeda Pharmaceuticals U.S.A., Inc.$338
- Pfizer$278
- Gilead$164
- Johnson & Johnson$161
- plus $547 from 8 others
What the payments were for
- Food & beverage$2,15581%
- Other$50919%
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 | 44 | $667 |
| Olympus America Inc. | 1 | $509 |
| Takeda Pharmaceuticals U.S.A., Inc. | 20 | $338 |
| Pfizer | 18 | $278 |
| Gilead | 9 | $164 |
| Johnson & Johnson | 8 | $161 |
| Phathom Pharmaceuticals, Inc. | 3 | $159 |
| Bristol Myers Squibb | 8 | $127 |
| Regeneron Healthcare Solutions, Inc. | 3 | $101 |
| Nestle Healthcare Nutrition Inc. | 3 | $45 |
| Ipsen Biopharmaceuticals, Inc | 2 | $39 |
| Braintree Laboratories, Inc. | 2 | $32 |
| Ferring Pharmaceuticals Inc. | 2 | $27 |
| Conmed Corporation | 1 | $17 |
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
$2,664 in reported general payments places this provider in the 75th percentile of 26 gastroenterology providers in North Dakota.
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 |
|---|---|---|
| Omeprazole | 107 | $1,122 |
| Pantoprazole Sodium | 36 | $490 |
| Famotidine | 14 | $75 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Fargo
- Arezoo TaheriFargo$28K
- Israr SheikhFargo$5K
- Fadel NammourFargo$3K
- Kimberly KolkhorstFargo$947
- Ross MeidingerFargo$887
- Emuejevoke OkohFargo$772
- Navin PaulFargo$743
- Settihalli RajenderFargo$397
- Steven PletcherFargo$323
- Syed ZaidiBismarck$6K
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.