Gadson John Johnson, M.D.
Psychiatry Physician · Santa Monica, CA
Gadson John Johnson, M.D. is a psychiatry physician with a practice address in Santa Monica, California, and NPI 1578767232, issued on Jun 14, 2007. Check the license (California A100422, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gadson John Johnson
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A100422 CA
Self-reported in NPPES; status is on the state search - Practice location
- 701 Santa Monica Blvd, Santa Monica, CA 90401
- Phone
- (310) 993-4103
- Enumerated
- Jun 14, 2007
- Record last updated
- Mar 1, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 00A100422 CA
- Medicare enrollment
- Enrolled (PECOS I20090605000608); accepts Medicare assignment
- Medical or professional school
- Un Of California, Irvine, College Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 701 Santa Monica Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brandy Cohen-Brown, D.O.Psychiatry Physician1699980060
Verify Gadson John Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8.4 times the Medicare Part D claims of the average psychiatry physician in 2024
8,430 Medicare Part D claims for 656 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Divalproex Sodium1,134 claims
- Quetiapine Fumarate970 claims
- Risperidone747 claims
- Olanzapine595 claims
- Olanzapine Odt478 claims
- Mirtazapine328 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.
The MIPS final score for 2023 (Medicare payment program): 5.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Oceanside Medical Group A Medical CorporationSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gadson John Johnson among 8,673 psychiatry physician records in California
Gadson John Johnson, 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 fileYes · 38% of these records are
- Graduated2005 · median 2005 among the 3,295 with a school on file
- Record last updated2012 · 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).
78 psychiatry physician records list a practice address in Santa Monica
They are 78 of the 5,151 NPPES records with a practice address in Santa Monica, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Santa Monica → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Daniel Begel, M.D.Santa Monica, CA 904011376609149
- Brandy Cohen-Brown, D.O.Santa Monica, CA 904011699980060
- James High, M.D.Santa Monica, CA 904011124376447
- Igor Hunkoff, MDSanta Monica, CA 904011629273396
- Gina In, MDSanta Monica, CA 904011861759672
- Nathalie Maullin, M.D.Santa Monica, CA 904011770567612
- Mena Mirhom, M.DSanta Monica, CA 904011285089243
- Loreta Mulokas, MDSanta Monica, CA 904011679594659
Common questions
What is Gadson John Johnson, M.D.'s NPI number?
Gadson John Johnson, M.D.'s National Provider Identifier (NPI) is 1578767232, issued on Jun 14, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gadson John Johnson, M.D. located?
The NPPES record lists a practice address at 701 Santa Monica Blvd, Santa Monica, CA, 90401. Phone: (310) 993-4103. Providers update this record themselves, so call before visiting.
How can I verify Gadson John Johnson, M.D.'s license?
NPPES lists California license number A100422, 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 Gadson John Johnson, M.D. prescribe under Medicare Part D?
In 2024, Gadson John Johnson, M.D. had 8,430 Medicare Part D claims for 656 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
What is Gadson John Johnson, M.D.'s MIPS final score?
The 2023 MIPS final score is 5.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.