Francis Yung-Kang Yao, MD
Internal Medicine, Gastroenterology (MD) with UCSF Medical Group Business Services and 2 other groups, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $1,369,263 for 1,593 claims, against $98,546 paid for services in 2024. Gilead Sciences, Inc. was the largest of 2 companies reporting payments in 2025, $25,136 in all, mostly speaking and faculty fees. Lists Community Hospital of the Monterey Peninsula and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1134177470 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 5, 2006 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | G65786 | CA |
| Internal Medicine | 207R00000X | G65786 | CA |
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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 326 |
|---|---|
| Services billed | 1,238 across 30 procedure codes |
| Paid by Medicare | $98,546 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,593 · 2,926 30-day fills |
|---|---|
| Patients | 230 |
| Total drug cost | $1,369,263 |
| Generic share | 61% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical groups
- UCSF Medical Group Business ServicesSan Francisco, CA · 1,598 clinicians
- County of Santa ClaraSan Jose, CA · 1,022 clinicians
- Regents of the University of CaliforniaSan Francisco, CA · 732 clinicians
Hospital affiliations
- Community Hospital of the Monterey PeninsulaMonterey, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- Peninsula Medical CenterBurlingame, CA
- Santa Clara Valley Medical CenterSan Jose, CA
- UCSF Medical CenterSan Francisco, CA
Industry payments (Open Payments)
- 2025$25,136 · 21 payments from 2 companies
- 2024$36,223 · 31 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $12,980 | 11 |
| Boston Scientific Corporation | $12,156 | 10 |
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$18,528 · 7 payments
- Travel and Lodging$3,339 · 6 payments
- Food and Beverage$1,639 · 7 payments
- Consulting Fee$1,630 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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