William Earle Bonis, MD
NPI 1689779209ActiveIndividual· Internal Medicine, Hematology & Oncology· Chico, CA
Internal Medicine, Hematology & Oncology (MD) with Marshall Medical Center, practicing in Chico, California. Their prescriptions cost Medicare Part D more than their services did: $1,162,836 for 421 claims, against $1,816 paid for services in 2024. Cardinal Health 110 LLC was the largest of 3 companies reporting payments in 2025, $563.14 in all, mostly food and beverage. Lists Enloe Health and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1689779209 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Sep 14, 2006 |
| Last updated in NPPES | Oct 2, 2026 |
| Certified by provider | Oct 2, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A53478 | CA |
| Internal Medicine, Hematology & Oncology | 207RH0003X | MD61518247 | WA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA); Practitioner - Hematology/Oncology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 39 |
|---|---|
| Services billed | 42 across 4 procedure codes |
| Paid by Medicare | $1,816 |
Part D prescriptions in 2024
| Prescriptions (claims) | 421 · 534 30-day fills |
|---|---|
| Patients | 115 |
| Total drug cost | $1,162,836 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 1990 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Marshall Medical CenterPlacerville, CA · 176 clinicians
Hospital affiliations
- Enloe HealthChico, CA
- Jefferson HealthcarePort Townsend, WA
- Marshall Medical CenterPlacerville, CA
- Peacehealth United General Medical CenterSedro Woolley, WA
- Swedish Medical CenterSeattle, WA
Industry payments (Open Payments)
- 2025$563.14 · 33 payments from 3 companies
- 2024$416.33 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Cardinal Health 110 LLC | $275.00 | 1 |
| Zynex Medical, Inc. | $258.78 | 31 |
| Regeneron Healthcare Solutions, Inc. | $29.36 | 1 |
What the 2025 payments were for
- Food and Beverage$288.14 · 32 payments
- Consulting Fee$275.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Chico
- 1649736687
- 1912465915
- 1447393442
- 1023342466
- 1447322292
- 1376539411
- 1043287378
- 1255780938
- 1114190972
- 1447612080
All Internal Medicine, Hematology & Oncology providers in California →