William M. Gillespie, M.D.
NPI 1538238118ActiveIndividual· Psychiatry & Neurology, Psychiatry· Glendora, CA
Psychiatry & Neurology, Psychiatry (M.D.) in Glendora, California, trained at University of California, Geffen School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $1,838,578 for 19,241 claims, against $374,117 paid for services in 2024. Vanda Pharmaceuticals Inc. was the largest of 17 companies reporting payments in 2025, $2,640 in all, mostly food and beverage.
Overview
| NPI | 1538238118 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Nov 7, 2006 |
| Last updated in NPPES | Feb 28, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | G81203 | 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 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 - Psychiatry (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,248 |
|---|---|
| Services billed | 5,514 across 17 procedure codes |
| Paid by Medicare | $374,117 |
Part D prescriptions in 2024
| Prescriptions (claims) | 19,241 · 20,893 30-day fills |
|---|---|
| Patients | 855 |
| Total drug cost | $1,838,578 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Psychiatry |
| Telehealth | Offers telehealth |
Medical group
- William Gillespie and Associates IncGlendora, CA · 16 clinicians
Hospital affiliations
- L A Downtown Medical CenterLos Angeles, CA
- Los Angeles Community HospitalLos Angeles, CA
- San Gabriel Valley Medical CenterSan Gabriel, CA
- Southern California Hospital at HollywoodHollywood, CA
Industry payments (Open Payments)
- 2025$2,640 · 160 payments from 17 companies
- 2024$2,915 · 178 payments from 18 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vanda Pharmaceuticals Inc. | $436.95 | 20 |
| Teva Pharmaceuticals USA, Inc. | $428.56 | 23 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $308.98 | 21 |
| Janssen Pharmaceuticals, Inc | $247.22 | 15 |
| Otsuka America Pharmaceutical, Inc. | $244.17 | 19 |
What the 2025 payments were for
- Food and Beverage$2,492 · 157 payments
- Education$147.85 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Psychiatry & Neurology, Psychiatry providers in Glendora
- 1053935361
- 1932997467
- 1730899667
- 1700382033
- 1114756160
- 1548614613
- 1841747342
- 1740084235
- 1558771246
- 1598875239
- 1770521734
- 1407315864
All Psychiatry & Neurology, Psychiatry providers in California →