Douglas D. Zhang, M.D.
NPI 1023074341ActiveIndividual· Family Medicine, Geriatric Medicine· San Leandro, CA
Family Medicine, Geriatric Medicine (M.D.) in San Leandro, California, trained at Texas Tech University Health Science Center School of Medicine (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $1,445,855 for 14,152 claims, against $370,755 paid for services in 2024. Novo Nordisk Inc was the largest of 17 companies reporting payments in 2025, $1,427 in all, mostly food and beverage.
Overview
| NPI | 1023074341 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 25, 2006 |
| Last updated in NPPES | Mar 23, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine, Geriatric Medicine Primary | 207QG0300X | A63200 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - General Practice (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 789 |
|---|---|
| Services billed | 5,659 across 33 procedure codes |
| Paid by Medicare | $370,755 |
Part D prescriptions in 2024
| Prescriptions (claims) | 14,152 · 28,811 30-day fills |
|---|---|
| Patients | 963 |
| Total drug cost | $1,445,855 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Texas Tech University Health Science Center School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | General Practice |
Hospital affiliations
- Alta Bates Summit Medical CenterOakland, CA
- Eden Medical CenterCastro Valley, CA
- Highland HospitalOakland, CA
- Stanford Health CareStanford, CA
Other facilities
- A1 Pro Home Health Inc.Home health agency · San Leandro, CA
- Amedisys Home Health CareHome health agency · Hayward, CA
- Blc Homehealth IncHome health agency · San Leandro, CA
- Centerwell Asian American Home HealthHome health agency · Alameda, CA
- Vital Home Health CareHome health agency · Hayward, CA
Industry payments (Open Payments)
- 2025$1,427 · 73 payments from 17 companies
- 2024$1,612 · 75 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $257.22 | 21 |
| Astrazeneca Pharmaceuticals LP | $205.52 | 10 |
| Glaxosmithkline, LLC. | $182.29 | 6 |
| Kowa Pharmaceuticals America, Inc. | $153.00 | 9 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $140.39 | 7 |
What the 2025 payments were for
- Food and Beverage$1,427 · 73 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Family Medicine, Geriatric Medicine providers in San Leandro
- 1134188360
All Family Medicine, Geriatric Medicine providers in California →