WILLIAM HENRY MAZZARELLA JR. COUNSELOR
NPI 1770787111
Registered Nurse - Addiction (Substance Use Disorder) in San Diego, CA
About William Henry Mazzarella Jr. Counselor NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM HENRY MAZZARELLA JR. COUNSELOR (NPI 1770787111) is an individual addiction (substance use disorder) provider in San Diego, California, licensed in California (530630) and active in the NPI registry since June 2007.
NPPES Registry Identity
Specialties & Licenses
Other Providers at the Same Location NPPES 3
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 William Mazzarella's NPI number?
The NPI number for William Mazzarella is 1770787111. It was assigned to this individual provider in the NPPES registry on June 11, 2007.
Where is William Mazzarella located?
William Mazzarella practices at 2456 E St, San Diego, CA 92102. The listed phone number is (619) 503-7680.
What is William Mazzarella's specialty?
The primary specialty registered for this NPI is Registered Nurse, specializing in Addiction (Substance Use Disorder), with taxonomy code 163WA0400X.
When was this NPI record last updated?
The NPPES record for William Mazzarella was last updated on May 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.
# William Henry Mazzarella Jr., COUNSELOR · NPI 1770787111
Addiction (Substance Use Disorder) provider in San Diego, California. Individual provider, active in the CMS NPPES registry since June 11, 2007.
## Identity
- **NPI:** 1770787111 (Entity type: Individual)
- **Enumerated:** June 11, 2007
- **Primary specialty:** Registered Nurse - Addiction (Substance Use Disorder) · taxonomy 163WA0400X
- **State license:** 530630 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2456 E ST, San Diego, CA 92102-2024
- **Phone:** (619) 503-7680
## Record status
- **NPPES last updated:** May 17, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1770787111) · Data from the CMS NPPES public registry.