Tommy Yu-Do Yen, M.D.
NPI 1053421958ActiveIndividual· Internal Medicine, Gastroenterology· San Diego, CA
Internal Medicine, Gastroenterology (M.D.) in San Diego, California, trained at University of California, San Diego School of Medicine (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $176,258 for 298 claims, against $51,846 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 8 companies reporting payments in 2025, $1,957 in all, mostly food and beverage.
Overview
| NPI | 1053421958 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 30, 2006 |
| Last updated in NPPES | Aug 17, 2026 |
| Certified by provider | Aug 17, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 60085 | CA |
| Internal Medicine, Hepatology | 207RI0008X | 60085 | CA |
| Internal Medicine | 207R00000X | 60085 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA); Practitioner - Gastroenterology (MN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 135 |
|---|---|
| Services billed | 1,044 across 31 procedure codes |
| Paid by Medicare | $51,846 |
Part D prescriptions in 2024
| Prescriptions (claims) | 298 · 521 30-day fills |
|---|---|
| Patients | 172 |
| Total drug cost | $176,258 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Regents of the University of CaliforniaSan Diego, CA · 2,089 clinicians
- Sharp Rees-Stealy Medical Group IncSan Diego, CA · 884 clinicians
- St Josephs Medical CenterBrainerd, MN · 237 clinicians
- Barton Medical FoundationStateline, NV · 105 clinicians
Hospital affiliations
- Barton Memorial HospitalSouth Lake Tahoe, CA
- Essentia Health St Joseph's Medical CenterBrainerd, MN
- Grossmont HospitalLa Mesa, CA
- Sharp Memorial HospitalSan Diego, CA
- Uc San Diego Health Hillcrest - Hillcrest Med CtrSan Diego, CA
Industry payments (Open Payments)
- 2025$1,957 · 21 payments from 8 companies
- 2024$1,113 · 11 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $1,176 | 14 |
| Regeneron Pharmaceuticals, Inc. | $150.01 | 1 |
| Ipsen Biopharmaceuticals, Inc | $139.17 | 1 |
| Janssen Biotech, Inc. | $133.37 | 1 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $125.00 | 1 |
What the 2025 payments were for
- Food and Beverage$1,957 · 21 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 143 gastroenterologists in San Diego · All gastroenterologists in California