Dennis Yamamoto, M.D.
NPI 1245294123ActiveIndividual· Internal Medicine, Gastroenterology· Reno, NV
Internal Medicine, Gastroenterology (M.D.) in Reno, Nevada, trained at Michigan State University College of Human Medicine (class of 1978). Their prescriptions cost Medicare Part D more than their services did: $485,391 for 369 claims, against $14,576 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 15 companies reporting payments in 2025, $1,936 in all, mostly food and beverage.
Overview
| NPI | 1245294123 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2006 |
| Last updated in NPPES | Mar 28, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 5966 | NV |
| Internal Medicine | 207R00000X | 5966 | NV |
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 (NV) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 90 |
|---|---|
| Services billed | 185 across 9 procedure codes |
| Paid by Medicare | $14,576 |
Part D prescriptions in 2024
| Prescriptions (claims) | 369 · 631 30-day fills |
|---|---|
| Patients | 62 |
| Total drug cost | $485,391 |
| Generic share | 76% of claims |
Education and affiliations
| Medical school | Michigan State University College of Human Medicine |
|---|---|
| Graduation year | 1978 |
| Medicare specialty | Gastroenterology |
Medical group
- Digestive Health AssociatesReno, NV · 37 clinicians
Hospital affiliations
- Banner Churchill Community HospitalFallon, NV
- Northern Nevada Medical CenterSparks, NV
- Renown Regional Medical CenterReno, NV
- Renown South Meadows Medical CenterReno, NV
- Saint Mary's Regional Medical CenterReno, NV
Industry payments (Open Payments)
- 2025$1,936 · 75 payments from 15 companies
- 2024$1,472 · 59 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $487.19 | 10 |
| Abbvie Inc. | $475.33 | 28 |
| Gilead Sciences, Inc. | $196.07 | 4 |
| Ipsen Biopharmaceuticals, Inc | $177.47 | 4 |
| Qol Medical, LLC | $141.61 | 7 |
What the 2025 payments were for
- Food and Beverage$1,904 · 74 payments
- Education$32.27 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 30 gastroenterologists in Reno · All gastroenterologists in Nevada