William John Marks, MD
NPI 1053341693ActiveIndividual· Psychiatry & Neurology, Neurology· Stanford, CA
Psychiatry & Neurology, Neurology (MD) in Stanford, California, trained at Johns Hopkins University School of Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $17,183 for 99 claims, against $1,684 paid for services in 2024. Insightec,inc reported $26.43 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1053341693 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 3, 2006 |
| Last updated in NPPES | Nov 8, 2023 |
| Certified by provider | Nov 8, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Neurology Primary | 2084N0400X | A51191 | CA |
| Psychiatry & Neurology, Epilepsy | 2084E0001X | A51191 | CA |
| Psychiatry & Neurology, Clinical Neurophysiology | 2084N0600X | A51191 | CA |
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 - Neurology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 11 |
|---|---|
| Services billed | 21 across 4 procedure codes |
| Paid by Medicare | $1,684 |
Part D prescriptions in 2024
| Prescriptions (claims) | 99 · 228 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $17,183 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | Johns Hopkins University School of Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Neurology |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$26.43 · 1 payment from 1 company
- 2024$149.05 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insightec,inc | $26.43 | 1 |
What the 2025 payments were for
- Food and Beverage$26.43 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other neurologists in Stanford
- 1053623934
- 1124516398
- 1225443906
- 1255382065
- 1285111237
- 1285960005
- 1295296515
- 1356541759
- 1467727792
- 1467807289
- 1558500256
- 1639123383
All 78 neurologists in Stanford · All neurologists in California