George Y. Chao, MD
NPI 1548204506ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Modesto, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Modesto, California, trained at Tufts University School of Medicine (class of 1982). Their prescriptions cost Medicare Part D more than their services did: $5,776,180 for 16,245 claims, against $601,304 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 14 companies reporting payments in 2025, $5,437 in all, mostly consulting fees.
Overview
| NPI | 1548204506 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 16, 2006 |
| Last updated in NPPES | Feb 8, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | G62842 | 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 | 1,322 |
|---|---|
| Services billed | 27,094 across 20 procedure codes |
| Paid by Medicare | $601,304 |
Part D prescriptions in 2024
| Prescriptions (claims) | 16,245 · 39,699 30-day fills |
|---|---|
| Patients | 1,356 |
| Total drug cost | $5,776,180 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1982 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Sutter Valley Medical FoundationModesto, CA · 2,500 clinicians
Hospital affiliations
- Adventist Health SonoraSonora, CA
- Memorial Hospital Los BanosLos Banos, CA
- Memorial Medical CenterModesto, CA
- Mercy Medical CenterMerced, CA
- Sutter Medical Center, SacramentoSacramento, CA
Industry payments (Open Payments)
- 2025$5,437 · 31 payments from 14 companies
- 2024$2,772 · 33 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $3,739 | 7 |
| Novo Nordisk Inc | $370.28 | 5 |
| Ascendis Pharma Endocrinology Inc | $265.25 | 3 |
| Amgen Inc. | $255.03 | 3 |
| Novartis Pharmaceuticals Corporation | $186.07 | 3 |
What the 2025 payments were for
- Consulting Fee$3,430 · 2 payments
- Food and Beverage$2,007 · 29 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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