Louis Clayton Simpson, M.D.
Psychiatry Physician · Los Angeles, CA
Louis Clayton Simpson, M.D. is a psychiatry physician with a practice address in Los Angeles, California, and NPI 1710012695, issued on Feb 22, 2007. Check the license (California A25794, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Louis Clayton Simpson
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A25794 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3756 Santa Rosalia Dr, Los Angeles, CA 90008
- Phone
- (323) 299-1262
- Enumerated
- Feb 22, 2007
- Record last updated
- Mar 7, 2023
- Fax
- (323) 299-1273
- Medicaid ID
- A257940 CA
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 3756 Santa Rosalia Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Louis Clayton Simpson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A25794Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average psychiatry physician in 2024
489 Medicare Part D claims for 23 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Zolpidem Tartrate80 claims
- Benztropine Mesylate63 claims
- Olanzapine52 claims
- Diazepam33 claims
- Divalproex Sodium32 claims
- Paroxetine Hcl27 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.
Louis Clayton Simpson among 8,673 psychiatry physician records in California
Louis Clayton Simpson, 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 updated2023 · 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).
987 psychiatry physician records list a practice address in Los Angeles
They are 987 of the 69,537 NPPES records with a practice address in Los Angeles, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Los Angeles → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Neil Abidi, D.O.View Park, CA 900081760869937
- Ifeoma Chukwurah, RNView Park, CA 900081528624806
- Melvin Sigman, M.D.Los Angeles, CA 900081922186394
- Norberto TuasonLos Angeles, CA 900081841338555
- Maria Kellner, M.D.Los Angeles, CA 900071609840826
- Huey Merchant, M.D.Los Angeles, CA 900071376675934
- Man Cho, M.D.Los Angeles, CA 900061902952559
- Richard Lee, MD, MPHLos Angeles, CA 900101043623515
Common questions
What is Louis Clayton Simpson, M.D.'s NPI number?
Louis Clayton Simpson, M.D.'s National Provider Identifier (NPI) is 1710012695, issued on Feb 22, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Louis Clayton Simpson, M.D. located?
The NPPES record lists a practice address at 3756 Santa Rosalia Dr, Los Angeles, CA, 90008. Phone: (323) 299-1262. Providers update this record themselves, so call before visiting.
How can I verify Louis Clayton Simpson, M.D.'s license?
NPPES lists California license number A25794, 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 Louis Clayton Simpson, M.D. prescribe under Medicare Part D?
In 2024, Louis Clayton Simpson, M.D. had 489 Medicare Part D claims for 23 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.