Quick answers
- Where does James Y. Chao see patients?
- Medicare's clinician data lists 1 practice location in Mountain View, CA. Call before your visit to confirm the address.
- What is James Y. Chao's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Interventional Cardiology.
- Does James Y. Chao accept Medicare assignment?
- Yes. Medicare's clinician data says James Y. Chao accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for James Y. Chao?
- (650) 962-0242, as listed in official Medicare / NPI Registry data.
- What is James Y. Chao's NPI number?
- 1144455940. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where James Y. Chao is enrolled with Medicare (CMS data updated 2026-10-02).
- 525 S Dr, Suite 105Mountain View, CA 94040 (650) 962‑0242
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in Mountain View
Clinicians with the same Medicare primary specialty in Mountain View, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Oregon Health Sciences University School Of Medicine |
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144455940 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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