William Edward Gilli, M.D.
NPI 1447257100ActiveIndividual· Internal Medicine· Bakersfield, CA
Internal Medicine (M.D.) in Bakersfield, California, trained at University of Southern California Keck School of Medicine (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $728,700 for 9,965 claims, against $189,811 paid for services in 2024. Pfizer Inc. was the largest of 22 companies reporting payments in 2025, $1,337 in all, mostly food and beverage.
Overview
| NPI | 1447257100 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 7, 2005 |
| Last updated in NPPES | Oct 31, 2024 |
| Certified by provider | Oct 31, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G53033 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 474 |
|---|---|
| Services billed | 3,037 across 69 procedure codes |
| Paid by Medicare | $189,811 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,965 · 22,520 30-day fills |
|---|---|
| Patients | 698 |
| Total drug cost | $728,700 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Mesa West Medical IncBakersfield, CA · 2 clinicians
Hospital affiliations
- Adventist Health BakersfieldBakersfield, CA
- Bakersfield Memorial HospitalBakersfield, CA
- French Hospital Medical CenterSan Luis Obispo, CA
Other facilities
- Adventist Health Home Care ServicesHome health agency · Bakersfield, CA
- Around the Clock Home CareHome health agency · Bakersfield, CA
- Bakersfield Community Home HealthHome health agency · Bakersfield, CA
- Purpose Driven Home Health, LLCHome health agency · Bakersfield, CA
- Reliable Healthcare LLCHome health agency · Bakersfield, CA
- Bakersfield Community Hospice, IncHospice · Bakersfield, CA
Industry payments (Open Payments)
- 2025$1,337 · 74 payments from 22 companies
- 2024$1,174 · 58 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $223.27 | 10 |
| Astrazeneca Pharmaceuticals LP | $189.65 | 11 |
| Novo Nordisk Inc | $171.23 | 4 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $136.29 | 17 |
| Lilly USA, LLC | $124.10 | 7 |
What the 2025 payments were for
- Food and Beverage$1,337 · 74 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 280 internal medicine physicians in Bakersfield · All internal medicine physicians in California