Joan Barbara Gerbasi, M.D.
Forensic Psychiatry Physician · Davis, CA
Joan Barbara Gerbasi, M.D. is a forensic psychiatry physician with a practice address in Davis, California, and NPI 1912108473, issued on May 30, 2007. Check the license (California A64664, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joan Barbara Gerbasi
- Credential
- M.D.
- Primary taxonomy
- Forensic Psychiatry Physician 2084F0202X
- License number
- A64664 CA
Self-reported in NPPES; status is on the state search - Practice location
- 423 E St, Davis, CA 95616
- Phone
- (530) 753-4636
- Enumerated
- May 30, 2007
- Record last updated
- Sep 11, 2025
- Fax
- (530) 753-4655
- Medicare enrollment
- Enrolled (PECOS I20220816001431); may accept Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest forensic psychiatry physician records → All 109 in California → Look up another NPI →
Also registered at 423 E St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Samantha BuonaratiRegistered Dietitian1669365029
- Marian Zingaro, D.C.Chiropractor1629482898
Verify Joan Barbara Gerbasi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64664Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average forensic psychiatry physician in 2024
80 Medicare Part D claims, against an average of 803 among the 199 providers of this specialty who prescribed in Part D.
Most prescribed
- Quetiapine Fumarate12 claims
- Sertraline Hcl12 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.
One hospital affiliation
- Montefiore Medical CenterBronx, NY · Acute Care Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Joan Barbara Gerbasi among 109 forensic psychiatry physician records in California
Joan Barbara Gerbasi, 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 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 28% newer
- In a Medicare fileYes · 41% of these records are
- In the CMS Doctors and Clinicians fileYes · 14% of these records are
- Graduated1996 · median 1997 among the 15 with a school on file
- Record last updated2025 · 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 Davis → Forensic Psychiatry Physician nationwide →
The 8 forensic psychiatry physician records with the nearest ZIP codes
- Matthew Soulier, MDFolsom, CA 956301417935255
- Frederick Fowler, MDIone, CA 956401902047533
- K Kumar, M.D.Vacaville, CA 956871124221940
- Craig Essex, D.O.Vacaville, CA 956961447358353
- Asha Gandhi, M.D.Vacaville, CA 956961265415012
- Michael Heiman, M.D.Sonoma, CA 954761083878383
- Samuel Libeu, MDElk Grove, CA 957581093079089
- Charles Schaffer, M.D.Sacramento, CA 958161114132313
Common questions
What is Joan Barbara Gerbasi, M.D.'s NPI number?
Joan Barbara Gerbasi, M.D.'s National Provider Identifier (NPI) is 1912108473, issued on May 30, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joan Barbara Gerbasi, M.D. located?
The NPPES record lists a practice address at 423 E St, Davis, CA, 95616. Phone: (530) 753-4636. Providers update this record themselves, so call before visiting.
How can I verify Joan Barbara Gerbasi, M.D.'s license?
NPPES lists California license number A64664, 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 Joan Barbara Gerbasi, M.D. prescribe under Medicare Part D?
In 2024, Joan Barbara Gerbasi, M.D. had 80 Medicare Part D claims; the average among forensic psychiatry physician prescribers was 803. 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.