Ralph L. Peterson, MD
Internal Medicine, Gastroenterology (MD) in Oakland, California, trained at Howard University College of Medicine (class of 1978). Their prescriptions cost Medicare Part D more than their services did: $661,586 for 1,396 claims, against $133,191 paid for services in 2024. Gilead Sciences, Inc. was the largest of 7 companies reporting payments in 2025, $11,902 in all, mostly speaking and faculty fees. A record with the same name and state is on the OIG exclusion list; it carries no NPI, so check it before acting.
Overview
| NPI | 1851311104 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 20, 2006 |
| Last updated in NPPES | Dec 2, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | G49099 | CA |
Exclusion screening
Possible match: verify before acting. The OIG list has a record with the same name in California, but that record carries no NPI, so it may be a different person or business.
| Matched by | Name on OIG list | Exclusion type | Excluded since | Location |
|---|---|---|---|---|
| Name + state | Ralph Peterson · Clerk/Other Clerical | 1128a1 | Mar 20, 2006 | Highland, CA |
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | Possible (name) | See above |
| 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) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 271 |
|---|---|
| Services billed | 1,048 across 12 procedure codes |
| Paid by Medicare | $133,191 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,396 · 1,769 30-day fills |
|---|---|
| Patients | 235 |
| Total drug cost | $661,586 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Howard University College of Medicine |
|---|---|
| Graduation year | 1978 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$11,902 · 49 payments from 7 companies
- 2024$10,244 · 32 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $11,072 | 16 |
| Madrigal Pharmaceuticals | $534.01 | 19 |
| Phathom Pharmaceuticals, Inc. | $96.77 | 5 |
| Braintree Laboratories, Inc. | $91.15 | 4 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $61.05 | 3 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$9,900 · 4 payments
- Food and Beverage$1,161 · 42 payments
- Travel and Lodging$840.33 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Oakland
- 1003234501
- 1205161130
- 1225058159
- 1225095763
- 1396109914
- 1427006006
- 1790743359
- 1912439266
- 1942598396
- 1104142025
- 1235197898
- 1013379841
All 30 gastroenterologists in Oakland · All gastroenterologists in California