Matthew Craig Williams, MD
NPI 1326626797ActiveIndividual· Psychiatry & Neurology, Child & Adolescent Psychiatry· Mill Valley, CA
Psychiatry & Neurology, Child & Adolescent Psychiatry (MD) in Mill Valley, California, trained at Georgetown University School of Medicine (class of 2021). Their prescriptions cost Medicare Part D more than their services did: $117,648 for 630 claims, against $14,801 paid for services in 2024.
Overview
| NPI | 1326626797 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 29, 2021 |
| Last updated in NPPES | Jun 9, 2026 |
| Certified by provider | Jun 9, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Child & Adolescent Psychiatry Primary | 2084P0804X | A186478 | CA |
| Psychiatry & Neurology, Psychiatry | 2084P0800X | A186478 | 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 - Psychiatry (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 47 |
|---|---|
| Services billed | 175 across 5 procedure codes |
| Paid by Medicare | $14,801 |
Part D prescriptions in 2024
| Prescriptions (claims) | 630 · 946 30-day fills |
|---|---|
| Patients | 59 |
| Total drug cost | $117,648 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 2021 |
| Medicare specialty | Psychiatry |
Medical group
- Bay Psychiatric AssociatesBerkeley, CA · 60 clinicians
Hospital affiliation
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other child and adolescent psychiatrists in Mill Valley
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- 1942695754
- 1205052693