Justin Ma, MD
NPI 1861141426 · Ophthalmology Physician · San Francisco, CA
Justin Ma, MD is a Ophthalmology Physician provider in San Francisco, CA (NPI 1861141426).
Provider details
- NPI number
- 1861141426
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A194699 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 40 | 13 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 23 | — |
| Timolol Maleate | 18 | — |
| Brimonidine Tartrate/Timololbrand: Brimonidine Tartrate-Timolol | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 31700 Temecula Pkwy Ste 2Temecula, CA 92592-5896Phone: (951) 600-4337
Registry dates
- Enumerated
- 2022-03-21
- Last updated
- 2026-05-01
- Certified
- 2026-05-01
Frequently asked questions
- What is Justin Ma's NPI number?
- Justin Ma's National Provider Identifier (NPI) is 1861141426, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Ma's specialty?
- Justin Ma is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Ma located?
- Justin Ma's practice location on file with NPPES is 490 Illinois Street,, San Francisco, CA 94158.
- What is Justin Ma's phone number?
- The practice phone number listed in the NPPES registry for Justin Ma is (415) 353-2020.
- Is Justin Ma's NPI active?
- Yes — Justin Ma's NPI (1861141426) is active in the NPPES registry as of the last update on 2026-05-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.