Winnie W. Chan, MD
NPI 1538521281ActiveIndividual· Emergency Medicine· Castro Valley, CA
Emergency Medicine (MD) in Castro Valley, California, trained at University of California, San Francisco School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $8,829 for 228 claims, against $2,551 paid for services in 2024.
Overview
| NPI | 1538521281 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 22, 2016 |
| Last updated in NPPES | May 31, 2022 |
| Certified by provider | May 31, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | A152574 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Emergency Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 30 |
|---|---|
| Services billed | 35 across 8 procedure codes |
| Paid by Medicare | $2,551 |
Part D prescriptions in 2024
| Prescriptions (claims) | 228 · 303 30-day fills |
|---|---|
| Patients | 132 |
| Total drug cost | $8,829 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of California, San Francisco School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Emergency Medicine |
Medical groups
- Permanente Medical Group IncOakland, CA · 10,996 clinicians
- Eden Emergency Medical Group IncCastro Valley, CA · 28 clinicians
Hospital affiliation
- Kaiser Foundation Hospital - San FranciscoSan Francisco, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 20 emergency medicine physicians in Castro Valley · All emergency medicine physicians in California