Quick answers
- Where does Chi L. Tsay see patients?
- Medicare's clinician data lists 1 practice location in Ontario, CA. Call before your visit to confirm the address.
- What is Chi L. Tsay's specialty?
- Medicare lists Anesthesiology as the primary specialty, and also Interventional Pain Management.
- Does Chi L. Tsay accept Medicare assignment?
- Yes. Medicare's clinician data says Chi L. Tsay 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 Chi L. Tsay?
- (909) 933-6580, as listed in official Medicare / NPI Registry data.
- What is Chi L. Tsay's NPI number?
- 1760450274. 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 Chi L. Tsay is enrolled with Medicare (CMS data updated 2026-10-02).
- 1211 W 6th StOntario, CA 91762 (909) 933‑6580
Specialties
- Anesthesiologyprimary
- Interventional Pain Managementalso
Other anesthesiologists in Ontario
Clinicians with the same Medicare primary specialty in Ontario, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1976 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1760450274 |
| 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