DR. JOHN HOLLENBERG MD
NPI 1083799225
Psychiatry & Neurology - Psychiatry in Canoga Park, CA
About Dr. John Hollenberg Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN HOLLENBERG MD (NPI 1083799225) is an individual psychiatry provider in Canoga Park, California, licensed in California (G00051020) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. John Hollenberg Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show John Hollenberg reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Canoga Park, CA 91303
- Reassigned Medicare billing, California enrollment
- 533 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91304 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Hollenberg's NPI number?
The NPI number for John Hollenberg is 1083799225. It was assigned to this individual provider in the NPPES registry on October 26, 2006.
Where is John Hollenberg located?
John Hollenberg practices at 7621 Canoga Ave, Canoga Park, CA 91304. The listed phone number is (818) 598-6900.
What is John Hollenberg's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is John Hollenberg enrolled in Medicare?
Yes. John Hollenberg is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for John Hollenberg's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Hollenberg reassigns Medicare benefits to Los Angeles County Department Of Mental Health (Canoga Park, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Hollenberg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Hollenberg was last updated on January 14, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Hollenberg, MD · NPI 1083799225
Psychiatry physician in Canoga Park, California. Individual provider, active in the CMS NPPES registry since October 26, 2006.
## Identity
- **NPI:** 1083799225 (Entity type: Individual)
- **Enumerated:** October 26, 2006
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** G00051020 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 7621 CANOGA AVE, Canoga Park, CA 91304-4912
- **Phone:** (818) 598-6900
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Los Angeles County Department Of Mental Health (NPI 1194108357, Canoga Park, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 14, 2014
- **Other identifiers:** Medicare PIN CB204648 (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1083799225) · Data from the CMS NPPES public registry.