Quick answers
- Where does Darwin C. Tsang see patients?
- Medicare's clinician data lists 1 practice location in San Rafael, CA. Call before your visit to confirm the address.
- What is Darwin C. Tsang's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Darwin C. Tsang accept Medicare assignment?
- Yes. Medicare's clinician data says Darwin C. Tsang 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 Darwin C. Tsang?
- (415) 453-3812, as listed in official Medicare / NPI Registry data.
- What is Darwin C. Tsang's NPI number?
- 1619344918. 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 Darwin C. Tsang is enrolled with Medicare (CMS data updated 2026-10-02).
- 1001 Grand AveSan Rafael, CA 94901 (415) 453‑3812
Group practices
Medicare enrollment lists Darwin C. Tsang as a member of this group (CMS data updated 2026-10-02).
- Marin Optometric Group Inc2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in San Rafael
Clinicians with the same Medicare primary specialty in San Rafael, CA — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | New England College Of Optometry |
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1619344918 |
| 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