John Samuel Chase, M.D.
Psychiatry Physician · San Francisco, CA
John Samuel Chase, M.D. is a psychiatry physician with a practice address in San Francisco, California, and NPI 1184743460, issued on Mar 28, 2007. Check the license (California G23970, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Samuel Chase
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G23970 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2116 Sutter St, San Francisco, CA 94115
- Phone
- (415) 346-0671
- Enumerated
- Mar 28, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 346-5213
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2116 Sutter St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Samuel Chase in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G23970Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average psychiatry physician in 2024
75 Medicare Part D claims, 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 Tartrate12 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.
John Samuel Chase among 8,673 psychiatry physician records in California
John Samuel Chase, 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 updated2007 · 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).
763 psychiatry physician records list a practice address in San Francisco
They are 763 of the 38,143 NPPES records with a practice address in San Francisco, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in San Francisco → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Julia Adler, MDSan Francisco, CA 941151417992694
- Bruce Baker, MDSan Francisco, CA 941151346283926
- Stephen Brockway, MDSan Francisco, CA 941151346213394
- Hideki Chin, M.D.San Francisco, CA 941151922028885
- Frederick Huang, MDSan Francisco, CA 941151922038405
- Salma Khan, M.D.San Francisco, CA 941151114914918
- Adair Look, M.D.San Francisco, CA 941151740207521
- Heather Muhr, D.O.San Francisco, CA 941151336166057
Common questions
What is John Samuel Chase, M.D.'s NPI number?
John Samuel Chase, M.D.'s National Provider Identifier (NPI) is 1184743460, issued on Mar 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Samuel Chase, M.D. located?
The NPPES record lists a practice address at 2116 Sutter St, San Francisco, CA, 94115. Phone: (415) 346-0671. Providers update this record themselves, so call before visiting.
How can I verify John Samuel Chase, M.D.'s license?
NPPES lists California license number G23970, 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 John Samuel Chase, M.D. prescribe under Medicare Part D?
In 2024, John Samuel Chase, M.D. had 75 Medicare Part D claims; 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.