Quick answers
- Where does Tom S. Chang see patients?
- Medicare's clinician data lists 2 practice locations, including Pasadena, CA and Palm Desert, CA. Call before your visit to confirm the address.
- What is Tom S. Chang's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Tom S. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Tom S. Chang 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 Tom S. Chang?
- (800) 898-2020, as listed in official Medicare / NPI Registry data.
- What is Tom S. Chang's NPI number?
- 1609848969. 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 Tom S. Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 E California BlvdPasadena, CA 91105 (800) 898‑2020
- 44139 Monterey Ave, Suite APalm Desert, CA 92260 (760) 779‑0800
Group practices
Medicare enrollment lists Tom S. Chang as a member of this group (CMS data updated 2026-10-02).
- Retina Institute of California Medical Group, a California Medical Par77 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Pasadena
Clinicians with the same Medicare primary specialty in Pasadena, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609848969 |
| 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