Cheng-Yang Christian Tuan, MD
NPI 1891746129ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· San Francisco, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in San Francisco, California, trained at New York University School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $7,293,252 for 13,019 claims, against $395,949 paid for services in 2024. Lilly USA, LLC was the largest of 24 companies reporting payments in 2025, $59,404 in all, mostly speaking and faculty fees.
Overview
| NPI | 1891746129 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 12, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A67915 | 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 - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 450 |
|---|---|
| Services billed | 5,831 across 20 procedure codes |
| Paid by Medicare | $395,949 |
Part D prescriptions in 2024
| Prescriptions (claims) | 13,019 · 31,598 30-day fills |
|---|---|
| Patients | 1,052 |
| Total drug cost | $7,293,252 |
| Generic share | 46% of claims |
Education and affiliations
| Medical school | New York University School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- California Pacific Medical Center - Mission BernalSan Francisco, CA
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- Chinese HospitalSan Francisco, CA
- Peninsula Medical CenterBurlingame, CA
- UCSF Medical CenterSan Francisco, CA
Industry payments (Open Payments)
- 2025$59,404 · 224 payments from 24 companies
- 2024$81,359 · 306 payments from 29 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $31,038 | 61 |
| Novo Nordisk Inc | $18,162 | 39 |
| Bayer Healthcare Pharmaceuticals Inc. | $7,174 | 13 |
| Dexcom, Inc. | $658.83 | 14 |
| Amgen Inc. | $454.09 | 18 |
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$51,826 · 41 payments
- Food and Beverage$5,050 · 163 payments
- Travel and Lodging$2,415 · 16 payments
- Education$113.18 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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