John Hollenberg, MD
NPI 1083799225 · Psychiatry Physician · Canoga Park, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Hollenberg, MD is a Psychiatry Physician provider in Canoga Park, CA (NPI 1083799225).
Provider details
- NPI number
- 1083799225
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G00051020 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-26
- Last updated
- 2014-01-14
Frequently asked questions
- What is John Hollenberg's NPI number?
- John Hollenberg's National Provider Identifier (NPI) is 1083799225, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Hollenberg's specialty?
- John Hollenberg is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Hollenberg located?
- John Hollenberg's practice location on file with NPPES is 7621 Canoga Ave, Canoga Park, CA 91304-4912.
- What is John Hollenberg's phone number?
- The practice phone number listed in the NPPES registry for John Hollenberg is (818) 598-6900.
- Does John Hollenberg accept Medicare?
- John Hollenberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Hollenberg's NPI active?
- Yes — John Hollenberg's NPI (1083799225) is active in the NPPES registry as of the last update on 2014-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.