Justin P. Ma, MD
Ophthalmology Physician · San Francisco, CA
Justin P. Ma, MD is an ophthalmology physician with a practice address in San Francisco, California, and NPI 1861141426, issued on Mar 21, 2022. Check the license (California A194699, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Justin P. Ma
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A194699 CA
Self-reported in NPPES; status is on the state search - Practice location
- 490 Illinois Street,, San Francisco, CA 94158
- Phone
- (415) 353-2020
- Enumerated
- Mar 21, 2022
- Record last updated
- Jun 29, 2026
- Medicare enrollment
- Enrolled (PECOS I20260513001658); may accept Medicare assignment
- Medical or professional school
- Duke University School Of Medicine, 2022
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 490 Illinois Street,
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Morgan Harvey, MDOphthalmology Physician1477054997
Verify Justin P. Ma in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A194699Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average ophthalmology physician in 2024
150 Medicare Part D claims for 45 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims.
Most prescribed
- Latanoprost40 claims
- Dorzolamide-Timolol23 claims
- Timolol Maleate18 claims
- Brimonidine Tartrate-Timolol11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Justin P. Ma among 2,899 ophthalmology physician records in California
Justin P. Ma, MD is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, under 1% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2022 · median 2001 among the 1,907 with a school on file
- Record last updated2026 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in San Francisco → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Lawrence ChanSan Francisco, CA 941581215497920
- Manuel ColonSan Francisco, CA 941581982353652
- Morgan Harvey, MDSan Francisco, CA 941581477054997
- Elana Meer, MDSan Francisco, CA 941581427707793
- Mark Nagy, MD, PHDSan Francisco, CA 941581811637945
- Sahar Noorani, MDSan Francisco, CA 941581437787595
- Neel Pasricha, M.D.San Francisco, CA 941581881056596
- Saraswathy Ramanathan, M.D.San Francisco, CA 941581326086828
Common questions
What is Justin P. Ma, MD's NPI number?
Justin P. Ma, MD's National Provider Identifier (NPI) is 1861141426, issued on Mar 21, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Justin P. Ma, MD located?
The NPPES record lists a practice address at 490 Illinois Street,, San Francisco, CA, 94158. Phone: (415) 353-2020. Providers update this record themselves, so call before visiting.
How can I verify Justin P. Ma, MD's license?
NPPES lists California license number A194699, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Justin P. Ma, MD prescribe under Medicare Part D?
In 2024, Justin P. Ma, MD had 150 Medicare Part D claims for 45 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.