Joel Steven Mostow, M.D.
Psychiatry Physician · Napa, CA
Joel Steven Mostow, M.D. is a psychiatry physician with a practice address in Napa, California, and NPI 1053351502, issued on Jun 6, 2006. Check the license (California G89065, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joel Steven Mostow
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- G89065 CA
036084695 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Napa Vallejo Hwy., Napa, CA 94558
- Phone
- (707) 253-5654
- Enumerated
- Jun 6, 2006
- Record last updated
- Jan 20, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (707) 253-5097
- Medicare enrollment
- Enrolled (PECOS I20151118002424); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1990
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2100 Napa Vallejo Hwy.
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kayla Allen, PSYDClinical Psychologist1972059681
- Grace Ang, M.D.Internal Medicine Physician1902990245
- Joseph Assouline, PSYDPsychologist1265796544
- Alexis Caplan, PSYDPsychologist1821422817
- Sabina Correa, PSYDPsychologist1083983803
- Miranda Dewitte, PSYDClinical Psychologist1487069159
Verify Joel Steven Mostow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G89065Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% more Medicare Part D claims than the average psychiatry physician in 2024
1,142 Medicare Part D claims for 22 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Clozapine272 claims
- Levothyroxine Sodium54 claims
- Caplyta48 claims
- Duloxetine Hcl48 claims
- Olanzapine43 claims
- Invega Sustenna39 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.
Bills Medicare through one group practice
- Department OF State HospitalsNapa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joel Steven Mostow among 8,673 psychiatry physician records in California
Joel Steven Mostow, 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 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated1990 · median 2005 among the 3,295 with a school on file
- Record last updated2015 · 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).
97 psychiatry physician records list a practice address in Napa
They are 97 of the 3,583 NPPES records with a practice address in Napa, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Napa → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Noorulain Aqeel, MDNapa, CA 945581811949944
- Victoria Cabanela, M.D.Napa, CA 945581407808819
- Lilian Dalida, MDNapa, CA 945581235181637
- Richard Frishman, MDNapa, CA 945581174507347
- Ahmed Haggag, MDNapa, CA 945581225080674
- Ernest Hanes, M. D.Napa, CA 945581659361574
- Eric Khoury, MDNapa, CA 945581972555274
- Sunil Kishan, MDNapa, CA 945581578515979
Common questions
What is Joel Steven Mostow, M.D.'s NPI number?
Joel Steven Mostow, M.D.'s National Provider Identifier (NPI) is 1053351502, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joel Steven Mostow, M.D. located?
The NPPES record lists a practice address at 2100 Napa Vallejo Hwy., Napa, CA, 94558. Phone: (707) 253-5654. Providers update this record themselves, so call before visiting.
How can I verify Joel Steven Mostow, M.D.'s license?
NPPES lists California license number G89065, 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 Joel Steven Mostow, M.D. prescribe under Medicare Part D?
In 2024, Joel Steven Mostow, M.D. had 1,142 Medicare Part D claims for 22 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.