John R. Chamberlain, M.D.
Forensic Psychiatry Physician · San Francisco, CA
John R. Chamberlain, M.D. is a forensic psychiatry physician with a practice address in San Francisco, California, and NPI 1114036480, issued on Aug 30, 2006. Check the license (California A065086, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John R. Chamberlain
- Credential
- M.D.
- Primary taxonomy
- Forensic Psychiatry Physician 2084F0202X
- License number
- A065086 CA
Self-reported in NPPES; status is on the state search - Practice location
- 401 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 476-7456
- Enumerated
- Aug 30, 2006
- Record last updated
- Apr 22, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 502-2206
- Medicare enrollment
- Enrolled (PECOS I20080227000749); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest forensic psychiatry physician records → All 109 in California → Look up another NPI →
Also registered at 401 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bibhav Acharya, M.D.Psychiatry Physician1306137427
- Alexander AcostaStudent in an Organized Health Care Education/Training Program1770161036
- Eric Alcid, M.D., PH.D.Psychiatry Physician1831622174
- Sean Amegadzie, MDPsychiatry Physician1427685403
- Alexandra Apple, PHDClinical Neuropsychologist1033871207
- Regina Armas, LCSW, PH.D.Clinical Psychologist1730118217
Verify John R. Chamberlain in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A065086Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average forensic psychiatry physician in 2024
98 Medicare Part D claims for 31 beneficiaries, against an average of 803 among the 199 providers of this specialty who prescribed in Part D.
Most prescribed
- Mirtazapine14 claims
- Diazepam13 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 practice group's MIPS final score for 2023 (Medicare payment program): 74.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John R. Chamberlain among 109 forensic psychiatry physician records in California
John R. Chamberlain, M.D. is one of 109 forensic psychiatry physician records with a practice address in California. 41% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 49% newer
- In a Medicare fileYes · 41% of these records are
- In the CMS Doctors and Clinicians fileYes · 14% of these records are
- Graduated1995 · median 1997 among the 15 with a school on file
- Record last updated2008 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084F0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Forensic Psychiatry Physician providers in California
There are 109 forensic psychiatry physician records in California.
All 109 in California → Every provider in San Francisco → Forensic Psychiatry Physician nationwide →
The 8 forensic psychiatry physician records with the nearest ZIP codes
- Renee Binder, M.D.San Francisco, CA 941431235173394
- Bobby SinghSan Francisco, CA 941211265537450
- Jeffrey Gould, MDSan Francisco, CA 941171669532404
- Katrina Peters, MDSan Francisco, CA 941101770651770
- Laurie Richer, DOSan Francisco, CA 941101215005202
- Loren Roth, M.D.San Francisco, CA 941101326246885
- Kalpana Nathan, MDMenlo Park, CA 940251245345248
- Brad Novak, M.D.Belmont, CA 940021437125671
Common questions
What is John R. Chamberlain, M.D.'s NPI number?
John R. Chamberlain, M.D.'s National Provider Identifier (NPI) is 1114036480, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John R. Chamberlain, M.D. located?
The NPPES record lists a practice address at 401 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 476-7456. Providers update this record themselves, so call before visiting.
How can I verify John R. Chamberlain, M.D.'s license?
NPPES lists California license number A065086, 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 R. Chamberlain, M.D. prescribe under Medicare Part D?
In 2024, John R. Chamberlain, M.D. had 98 Medicare Part D claims for 31 beneficiaries; the average among forensic psychiatry physician prescribers was 803. Part D covers Medicare prescriptions only.
What is John R. Chamberlain, M.D.'s MIPS final score?
The 2023 MIPS final score is 74.5 of 100, reported for the practice group. 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.