John K. Chan, MD
NPI 1962596551ActiveIndividual· Obstetrics & Gynecology, Gynecologic Oncology· San Francisco, CA
Obstetrics & Gynecology, Gynecologic Oncology (MD) in San Francisco, California, trained at University of California, Geffen School of Medicine (class of 1995). 202 Medicare patients in 2024, $140,805 paid; nearly all of their 108 Part D prescriptions were generic (91%). Glaxosmithkline, LLC. was the largest of 12 companies reporting payments in 2025, $338,199 in all, mostly speaking and faculty fees.
Overview
| NPI | 1962596551 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 3, 2006 |
| Last updated in NPPES | May 28, 2020 |
| Certified by provider | May 28, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology, Gynecologic Oncology Primary | 207VX0201X | A61661 | CA |
| Obstetrics & Gynecology | 207V00000X | A61661 | 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 - Gynecological Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 202 |
|---|---|
| Services billed | 606 across 37 procedure codes |
| Paid by Medicare | $140,805 |
Part D prescriptions in 2024
| Prescriptions (claims) | 108 · 116 30-day fills |
|---|---|
| Patients | 79 |
| Total drug cost | $108,385 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Gynecological Oncology |
| Telehealth | Offers telehealth |
Medical group
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
Hospital affiliations
- Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CA
- California Pacific Medical Center - Mission BernalSan Francisco, CA
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- California Pacific Medical Ctr-Davies Campus HospSan Francisco, CA
- Peninsula Medical CenterBurlingame, CA
Industry payments (Open Payments)
- 2025$338,199 · 201 payments from 12 companies
- 2024$339,389 · 193 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $137,769 | 78 |
| Eisai Inc. | $81,693 | 48 |
| Astrazeneca Pharmaceuticals LP | $63,020 | 29 |
| Abbvie Inc. | $21,958 | 11 |
| Genmab U.S., Inc. | $19,577 | 13 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$218,118 · 55 payments
- Compensation for serving as faculty or as a speaker for a medical education program$69,363 · 22 payments
- Travel and Lodging$23,242 · 54 payments
- Consulting Fee$21,808 · 10 payments
- Food and Beverage$5,578 · 58 payments
- Education$90.20 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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