Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Henry Mazzarella Jr., COUNSELOR

Addiction (Substance Use Disorder) Registered Nurse in San Diego, CA · enumerated 2007 · practices at Bh-Sd Dd Opco, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1770787111

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William Henry Mazzarella Jr.

Credential COUNSELOR

Sex Male

Practice address 2456 E St, San Diego, CA, 92102

Phone (619) 503-7680

Enumeration date Jun 11, 2007

Last updated in NPPES May 17, 2026

Taxonomy & licenses

163WA0400X Addiction (Substance Use Disorder) Registered Nurse Nursing Service Providers · License 530630 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Mazzarella practice?

The practice location on file with NPPES is in San Diego, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Mazzarella?

The National Provider Identifier (NPI) for William Mazzarella is 1770787111, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Nadia Lugue Licensed Vocational Nurse · San Diego, CA NPI 1831452432 Tylline Morgan Licensed Vocational Nurse · San Diego, CA NPI 1689938227 Bh-Sd Dd Opco, LLC Substance Abuse Rehabilitation Facility · San Diego, CA NPI 1629627609

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-17.