William N. Chu, M.D.
NPI 1194875054ActiveIndividual· Internal Medicine· Palo Alto, CA
Opted out of Medicare from February 2016 to February 2028. Internal Medicine (M.D.) in Palo Alto, California, licensed in CA, with an NPI issued in January 2007. Part D covered 2,369 prescriptions written in 2024, 86% of them generic. Pfizer Inc. was the largest of 14 companies reporting payments in 2025, $1,160 in all, mostly food and beverage.
Overview
| NPI | 1194875054 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 11, 2007 |
| Last updated in NPPES | Oct 9, 2020 |
| Certified by provider | Oct 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G76717 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Feb 8, 2016 – Feb 8, 2028 |
| Can order and refer | Yes |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Part D prescriptions in 2024
| Prescriptions (claims) | 2,369 · 5,393 30-day fills |
|---|---|
| Patients | 198 |
| Total drug cost | $290,417 |
| Generic share | 86% of claims |
Industry payments (Open Payments)
- 2025$1,160 · 56 payments from 14 companies
- 2024$1,281 · 67 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $295.83 | 17 |
| Novo Nordisk Inc | $231.69 | 12 |
| Abbvie Inc. | $149.67 | 6 |
| Exact Sciences Corporation | $100.25 | 4 |
| Cmp Pharma, Inc. | $67.82 | 3 |
What the 2025 payments were for
- Food and Beverage$1,160 · 56 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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