Sandi T. Woo, PA-C
NPI 1225103161ActiveIndividual· Physician Assistant, Medical· Castro Valley, CA
Physician Assistant, Medical (PA-C) in Castro Valley, California, trained at Duke University School of Medicine (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $646,086 for 2,428 claims, against $84,697 paid for services in 2024. Heartflow, Inc. was the largest of 4 companies reporting payments in 2025, $350.49 in all, mostly food and beverage.
Overview
| NPI | 1225103161 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Nov 22, 2006 |
| Last updated in NPPES | Jul 1, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant, Medical Primary | 363AM0700X | PA18589 | 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 - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 592 |
|---|---|
| Services billed | 953 across 18 procedure codes |
| Paid by Medicare | $84,697 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,428 · 5,387 30-day fills |
|---|---|
| Patients | 835 |
| Total drug cost | $646,086 |
| Generic share | 76% of claims |
Education and affiliations
| Medical school | Duke University School of Medicine |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
Hospital affiliations
- Alta Bates Summit Medical CenterOakland, CA
- Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CA
- Eden Medical CenterCastro Valley, CA
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$350.49 · 7 payments from 4 companies
- 2024$678.77 · 9 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Heartflow, Inc. | $167.45 | 1 |
| Abbott Laboratories | $125.20 | 4 |
| Boston Scientific Corporation | $37.62 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $20.22 | 1 |
What the 2025 payments were for
- Food and Beverage$330.27 · 6 payments
- Education$20.22 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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