John Hollenberg, MD
Psychiatry Physician · Canoga Park, CA
John Hollenberg, MD is a psychiatry physician with a practice address in Canoga Park, California, and NPI 1083799225, issued on Oct 26, 2006. Check the license (California G00051020, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Hollenberg
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G00051020 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7621 Canoga Ave, Canoga Park, CA 91304
- Phone
- (818) 598-6900
- Enumerated
- Oct 26, 2006
- Record last updated
- Jan 14, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 7621 Canoga Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rehan Aghvinian, LCSWClinical Social Worker1326462748
- Frank ArzagaLicensed Psychiatric Technician1215008719
- Althea BabbRehabilitation Practitioner1790816577
- Nancy Bejune, R.N.Psychiatric/Mental Health Registered Nurse1477625549
- Elizabeth Bower, RNMarriage & Family Therapist1023191848
- Stephanie Brynildsen, M.S.WSocial Worker1851792139
Verify John Hollenberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G00051020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Hollenberg among 8,673 psychiatry physician records in California
John Hollenberg, 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 not. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileNo · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2014 · 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. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 8,673 in California → Every provider in Canoga Park → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Andrew Do, M.D.Canoga Park, CA 913041518209683
- Ehtesham Syed, M.D.West Hills, CA 913041326020330
- Fabian Hernandez, D.O.Canoga Park, CA 913031467586693
- Alan Ruttenberg, MD INCCanoga Park, CA 913031073680021
- Rod Amiri, MDCalabasas, CA 913021083769293
- Robert Feeley, M.D.Calabasas, CA 913021518224328
- Roman Garcia, MD, PHDCalabasas, CA 913021033505169
- Tarik Hadzic, M.D., PH.D.Calabasas, CA 913021033559679
Common questions
What is John Hollenberg, MD's NPI number?
John Hollenberg, MD's National Provider Identifier (NPI) is 1083799225, issued on Oct 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Hollenberg, MD located?
The NPPES record lists a practice address at 7621 Canoga Ave, Canoga Park, CA, 91304. Phone: (818) 598-6900. Providers update this record themselves, so call before visiting.
How can I verify John Hollenberg, MD's license?
NPPES lists California license number G00051020, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.