Quick answers
- Where does Justin P. Ma see patients?
- Medicare's clinician data lists 2 practice locations, including San Francisco, CA. Call before your visit to confirm the address.
- What is Justin P. Ma's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Justin P. Ma accept Medicare assignment?
- Yes. Medicare's clinician data says Justin P. Ma 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 Justin P. Ma?
- (628) 206-8304, as listed in official Medicare / NPI Registry data.
- What is Justin P. Ma's NPI number?
- 1861141426. 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 Justin P. Ma is enrolled with Medicare (CMS data updated 2026-10-02).
- 1001 Potrero AveSan Francisco, CA 94110 (628) 206‑8304
- 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑4029
Group practices
Medicare enrollment lists Justin P. Ma as a member of these groups (CMS data updated 2026-10-02).
- Regents of the University of California732 clinicians in the group
- University of California SFGH Medical Group587 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1861141426 |
| 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