Brian John Koos, MD
Maternal & Fetal Medicine Physician · Los Angeles, CA
Brian John Koos, MD is a maternal & fetal medicine physician with a practice address in Los Angeles, California, and NPI 1033147913, issued on Jun 29, 2006. Check the license (California G44129, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Brian John Koos
- Credential
- MD
- Primary taxonomy
- Maternal & Fetal Medicine Physician 207VM0101X
- License number
- G44129 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Medical Plaza, Los Angeles, CA 90095
- Phone
- (310) 794-7274
- Enumerated
- Jun 29, 2006
- Record last updated
- Feb 13, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicaid ID
- 00G441290 CA
- Entity
- Type 1 · individual
8 nearest maternal & fetal medicine physician records → All 343 in California → Look up another NPI →
Also registered at 200 Medical Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Adrienne Bawa, REGISTERED NURSECase Management Registered Nurse1497355366
Verify Brian John Koos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G44129Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Brian John Koos among 343 maternal & fetal medicine physician records in California
Brian John Koos, MD is one of 343 maternal & fetal medicine physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 52% newer
- In a Medicare fileNo · 61% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2015 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Maternal & Fetal Medicine Physician providers in California
There are 343 maternal & fetal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 343 in California → Every provider in Los Angeles → Maternal & Fetal Medicine Physician nationwide →
The 8 maternal & fetal medicine physician records with the nearest ZIP codes
- Yalda Afshar, M.D., PH.D.Los Angeles, CA 900951629497763
- Simon Dadoun, MDLos Angeles, CA 900951376120105
- Rachel Gutkin, M.D.Los Angeles, CA 900951952580235
- Carla Janzen, MDLos Angeles, CA 900951568492643
- Lydia Lee, MDLos Angeles, CA 900951467419788
- Thalia MokLos Angeles, CA 900951922494327
- Amanda Mularz, M.D.Los Angeles, CA 900951649438367
- Aisling Murphy, MDLos Angeles, CA 900951235313974
Common questions
What is Brian John Koos, MD's NPI number?
Brian John Koos, MD's National Provider Identifier (NPI) is 1033147913, issued on Jun 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian John Koos, MD located?
The NPPES record lists a practice address at 200 Medical Plaza, Los Angeles, CA, 90095. Phone: (310) 794-7274. Providers update this record themselves, so call before visiting.
How can I verify Brian John Koos, MD's license?
NPPES lists California license number G44129, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.