Martha Brewer Koo, M.D.
Psychiatry Physician · Hermosa Beach, CA
Martha Brewer Koo, M.D. is a psychiatry physician with a practice address in Hermosa Beach, California, and NPI 1497899728, issued on Feb 19, 2007. Check the license (California G78080, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Martha Brewer Koo
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G78080 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2615 Pacific Coast Hwy, Hermosa Beach, CA 90254
- Phone
- (310) 318-2566
- Enumerated
- Feb 19, 2007
- Record last updated
- Jun 23, 2022
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2615 Pacific Coast Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patricia Baltazar, PHDClinical Psychologist1336174507
- Catherine Chambliss, MFTMarriage & Family Therapist1497764146
- Hyunjib Kim, PMHNPPsychiatric/Mental Health Nurse Practitioner1659097459
- Luz Lopez, MSBehavior Analyst1962039529
- Dennis Sanchez, DPTPhysical Therapist1760643308
- Jamie Suard, LMFTMarriage & Family Therapist1588012090
Verify Martha Brewer Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G78080Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average psychiatry physician in 2024
141 Medicare Part D claims for 18 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Escitalopram Oxalate14 claims
- Paroxetine Hcl12 claims
- Alprazolam11 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.
Martha Brewer Koo among 8,673 psychiatry physician records in California
Martha Brewer Koo, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 33% of them.
- NPI issued2007 · 33% of these records are older, 48% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 psychiatry physician records list a practice address in Hermosa Beach
They are 7 of the 510 NPPES records with a practice address in Hermosa Beach, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Hermosa Beach → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Steven Charles, M.D.Hermosa Beach, CA 902541225225998
- Elizabeth Cowart, MDHermosa Beach, CA 902541619046349
- Barry Edelman, M.D.Hermosa Beach, CA 902541821299306
- George Elias, M.D.Hermosa Beach, CA 902541588943898
- Amir Ettekal, M.D.Hermosa Beach, CA 902541982728127
- Sonia Parikh, MDHermosa Beach, CA 902541306102256
- Gordon Brion, M.D.Riverside, CA 902531588901219
- Gopal Gabbur, MDHuntington Park, CA 902551841492915
Common questions
What is Martha Brewer Koo, M.D.'s NPI number?
Martha Brewer Koo, M.D.'s National Provider Identifier (NPI) is 1497899728, issued on Feb 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Martha Brewer Koo, M.D. located?
The NPPES record lists a practice address at 2615 Pacific Coast Hwy, Hermosa Beach, CA, 90254. Phone: (310) 318-2566. Providers update this record themselves, so call before visiting.
How can I verify Martha Brewer Koo, M.D.'s license?
NPPES lists California license number G78080, 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 Martha Brewer Koo, M.D. prescribe under Medicare Part D?
In 2024, Martha Brewer Koo, M.D. had 141 Medicare Part D claims for 18 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.