Alan L. Berkowitz, MD
Psychiatry Physician · San Marcos, CA
Alan L. Berkowitz, MD is a psychiatry physician with a practice address in San Marcos, California, and NPI 1578519476, issued on May 25, 2006. Check the license (California G55943, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alan L. Berkowitz
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G55943 CA
Self-reported in NPPES; status is on the state search - Practice location
- 277 Rancheros Dr Ste 301, San Marcos, CA 92069
- Phone
- (760) 471-4073
- Enumerated
- May 25, 2006
- Record last updated
- May 1, 2026
- Fax
- (619) 528-4625
- Medicare enrollment
- Enrolled (PECOS I20080401000472); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1984
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 277 Rancheros Dr Ste 301
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Alessi, M.D.Psychiatry Physician1770685901
- Kevin Barr, MFTMarriage & Family Therapist1013260231
- Alicia Burke, DNPPsychiatric/Mental Health Nurse Practitioner1891233649
- Darryl Butson, LMFTMarriage & Family Therapist1538769393
- Eloisa DietrichPsychiatric/Mental Health Nurse Practitioner1134512288
- Nicholas Frost, MDPsychiatry Physician1730129651
Verify Alan L. Berkowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55943Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.2 times the Medicare Part D claims of the average psychiatry physician in 2024
3,179 Medicare Part D claims for 332 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
- Sertraline Hcl389 claims
- Quetiapine Fumarate296 claims
- Bupropion Xl216 claims
- Trazodone Hcl195 claims
- Aripiprazole194 claims
- Gabapentin190 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
- Mark David Levine MD Professional CorporationSan Marcos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alan L. Berkowitz among 8,673 psychiatry physician records in California
Alan L. Berkowitz, MD 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
- Graduated1984 · median 2005 among the 3,295 with a school on file
- Record last updated2026 · 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).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in San Marcos → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Robert Alessi, M.D.San Marcos, CA 920691770685901
- Claudio Cabrejos, MDSan Marcos, CA 920691033133483
- Sheila Cai, MDSan Marcos, CA 920691780625012
- Victor Doroski, MDSan Marcos, CA 920691851330351
- Nicole Esposito, MDSan Marcos, CA 920691497880579
- Nicholas Frost, MDSan Marcos, CA 920691730129651
- Josefa Licas, M.D.San Marcos, CA 920691083650535
- Beatriz Marfori, MDSan Marcos, CA 920691053484006
Common questions
What is Alan L. Berkowitz, MD's NPI number?
Alan L. Berkowitz, MD's National Provider Identifier (NPI) is 1578519476, issued on May 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alan L. Berkowitz, MD located?
The NPPES record lists a practice address at 277 Rancheros Dr Ste 301, San Marcos, CA, 92069. Phone: (760) 471-4073. Providers update this record themselves, so call before visiting.
How can I verify Alan L. Berkowitz, MD's license?
NPPES lists California license number G55943, 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 Alan L. Berkowitz, MD prescribe under Medicare Part D?
In 2024, Alan L. Berkowitz, MD had 3,179 Medicare Part D claims for 332 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.