William Koch Knapp, D.O.
NPI 1710207543ActiveIndividual· Hospitalist· Walnut Creek, CA
Hospitalist (D.O.) with John Muir Physician Network, practicing in Walnut Creek, California. In 2024 Medicare paid $61,398 for 308 patients, and Part D covered 288 of their prescriptions, 88% of them generic. Astrazeneca Pharmaceuticals LP reported $43.25 in payments in 2025, mostly education. Lists John Muir Medical Center - Concord Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1710207543 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jun 3, 2010 |
| Last updated in NPPES | Jan 21, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Hospitalist Primary | 208M00000X | 20A11948 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 308 |
|---|---|
| Services billed | 731 across 6 procedure codes |
| Paid by Medicare | $61,398 |
Part D prescriptions in 2024
| Prescriptions (claims) | 288 · 306 30-day fills |
|---|---|
| Patients | 140 |
| Total drug cost | $23,707 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2009 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$43.25 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $43.25 | 1 |
What the 2025 payments were for
- Education$43.25 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 72 hospitalists in Walnut Creek · All hospitalists in California