Mark Brown, MD
Emergency Medicine Physician · Lancaster, CA
Mark Brown, MD is an emergency medicine physician with a practice address in Lancaster, California, and NPI 1336105675, issued on Apr 25, 2006. Check the license (California G50087, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Brown
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G50087 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 W Avenue J, Lancaster, CA 93534
- Phone
- (661) 949-5000
- Enumerated
- Apr 25, 2006
- Record last updated
- May 15, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 00G500870 CA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1600 W Avenue J
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Beverly Kim AgniPsychiatric/Mental Health Registered Nurse1194542761
- Josephine Aideloje, NPPsychiatric/Mental Health Nurse Practitioner1790272243
- Imaobong AliyuAdult Psychiatric/Mental Health Registered Nurse1497343206
- Sam Allen, MDObstetrics & Gynecology Physician1982740841
Verify Mark Brown in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G50087Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average emergency medicine physician in 2024
102 Medicare Part D claims for 14 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Zolpidem Tartrate17 claims
- Jardiance12 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.
Mark Brown among 7,751 emergency medicine physician records in California
Mark Brown, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Lancaster → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Frederic Auerbach, MDLancaster, CA 935341023074713
- Frank Detrana, MDLancaster, CA 935341043275407
- Travis Deuson, MDLancaster, CA 935341598720963
- Diane Kehrli, NPLancaster, CA 935341174581532
- Thomas Lee, MDLancaster, CA 935341194781898
- Michael Leidner, MDLancaster, CA 935341538124987
- Andrew Lesser, M.D.Lancaster, CA 935341952326381
- Kitcha Ranch, MDLancaster, CA 935341053357681
Common questions
What is Mark Brown, MD's NPI number?
Mark Brown, MD's National Provider Identifier (NPI) is 1336105675, issued on Apr 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Brown, MD located?
The NPPES record lists a practice address at 1600 W Avenue J, Lancaster, CA, 93534. Phone: (661) 949-5000. Providers update this record themselves, so call before visiting.
How can I verify Mark Brown, MD's license?
NPPES lists California license number G50087, 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 Mark Brown, MD prescribe under Medicare Part D?
In 2024, Mark Brown, MD had 102 Medicare Part D claims for 14 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.