Quick answers
- Does George Y. Chao accept Medicare assignment?
- Yes. Medicare's clinician data says George Y. Chao accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does George Y. Chao see?
- In 2024, CMS data shows 1,322 Original Medicare patients and 27,094 services for George Y. Chao. This counts Original Medicare only and measures volume, not quality.
- What is George Y. Chao's NPI number?
- 1548204506. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for George Y. Chao, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,322 |
|---|---|
| Services billed to Medicare | 27,094 |
| Different services or procedures | 20 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, denosumab, 1 mg (J0897)13,620 services
- Injection, romosozumab-aqqg, 1 mg (J3111)8,190 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)2,148 services
- Injection of drug or substance under skin or into muscle (96372)323 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)164 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes65%
- Chronic kidney disease51%
- Arthritis48%
- Ischemic heart disease33%
Hospitals where George Y. Chao works
Medicare's Facility Affiliation Data lists George Y. Chao at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health SonoraSonora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050335
- Memorial Hospital Los BanosLos Banos, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050528
- Memorial Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050557
- Mercy Medical CenterMerced, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050444
- Sutter Medical Center, SacramentoSacramento, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050108
Practice locations
Addresses where George Y. Chao is enrolled with Medicare (CMS data updated October 2, 2026).
- 1700 Coffee RdModesto, CA 95355 (209) 526‑4500
- 2800 L StSacramento, CA 95816
- 600 Coffee RdModesto, CA 95355 (209) 524‑1211
Group practices
Medicare enrollment lists George Y. Chao as a member of this group (CMS data updated October 2, 2026).
- Sutter Valley Medical Foundation2,500 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Other clinicians in Sutter Valley Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 1982 (44 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548204506 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians