Leroy Wayne Keiser, M.D.
NPI 1417047283ActiveIndividual· Internal Medicine, Hematology & Oncology· Santa Rosa, CA
Internal Medicine, Hematology & Oncology (M.D.) in Santa Rosa, California, trained at Stanford University School of Medicine (class of 1973). Their prescriptions cost Medicare Part D more than their services did: $2,911,503 for 943 claims, against $217,374 paid for services in 2024. Amgen Inc. was the largest of 11 companies reporting payments in 2025, $13,345 in all, mostly speaking and faculty fees.
Overview
| NPI | 1417047283 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 13, 2006 |
| Last updated in NPPES | Nov 3, 2021 |
| Certified by provider | Nov 3, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | G28436 | CA |
| Internal Medicine, Hematology | 207RH0000X | G28436 | CA |
| Internal Medicine, Medical Oncology | 207RX0202X | G28436 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Medical Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 549 |
|---|---|
| Services billed | 2,645 across 18 procedure codes |
| Paid by Medicare | $217,374 |
Part D prescriptions in 2024
| Prescriptions (claims) | 943 · 1,374 30-day fills |
|---|---|
| Patients | 231 |
| Total drug cost | $2,911,503 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Stanford University School of Medicine |
|---|---|
| Graduation year | 1973 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Adventist Health ClearlakeClearlake, CA
- Adventist Health Mendocino CoastFort Bragg, CA
- Healdsburg HospitalHealdsburg, CA
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA
- Sonoma Valley HospitalSonoma, CA
Industry payments (Open Payments)
- 2025$13,345 · 26 payments from 11 companies
- 2024$16,832 · 16 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $13,046 | 14 |
| Astrazeneca Pharmaceuticals LP | $54.12 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $40.91 | 2 |
| Pfizer Inc. | $30.65 | 1 |
| Adc Therapeutics America, Inc. | $29.68 | 1 |
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$10,222 · 7 payments
- Travel and Lodging$2,612 · 5 payments
- Food and Beverage$481.19 · 13 payments
- Education$30.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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