Mark Winston Brown, M.D.
Specialist · Tustin, CA
Mark Winston Brown, M.D. is a specialist with a practice address in Tustin, California, and NPI 1982663050, issued on Mar 18, 2006. Check the license (California G35526, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Winston Brown
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G35526 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18102 Irvine Blvd, Tustin, CA 92780
- Phone
- (714) 508-4123
- Enumerated
- Mar 18, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (714) 508-4134
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 18102 Irvine Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Winston Brown in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G35526Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average specialist in 2024
22 Medicare Part D claims, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D.
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.
Mark Winston Brown among 5,749 specialist records in California
Mark Winston Brown, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2026 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Tustin → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Jennifer DialTustin, CA 927801487073284
- Wilfredo Escober, M.D.Tustin, CA 927801245311554
- Sabrina GaffoglioTustin, CA 927801205209350
- Charles Oh, M.D.Tustin, CA 927801780689042
- Pia RotmanTustin, CA 927801689093312
- Samireh Said, MDTustin, CA 927801336129998
- Mahaveer Khemka, M.DAnaheim, CA 928011568449965
- Kevin Kuettel, M.D.Anaheim, CA 928011740286384
Common questions
What is Mark Winston Brown, M.D.'s NPI number?
Mark Winston Brown, M.D.'s National Provider Identifier (NPI) is 1982663050, issued on Mar 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Winston Brown, M.D. located?
The NPPES record lists a practice address at 18102 Irvine Blvd, Tustin, CA, 92780. Phone: (714) 508-4123. Providers update this record themselves, so call before visiting.
How can I verify Mark Winston Brown, M.D.'s license?
NPPES lists California license number G35526, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Winston Brown, M.D. prescribe under Medicare Part D?
In 2024, Mark Winston Brown, M.D. had 22 Medicare Part D claims; the average among specialist prescribers was 1,380. 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.