Registry data as of Aug 27, 2026

William Mazzarella, COUNSELOR

Addiction (Substance Use Disorder) Registered Nurse · San Diego, CA

William Mazzarella, COUNSELOR is an addiction (substance use disorder) registered nurse with a practice address in San Diego, California, and NPI 1770787111, issued on Jun 11, 2007. Check the license with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, loaded Aug 27, 2026 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1770787111
Name
William Mazzarella
Credential
COUNSELOR
Primary taxonomy
Addiction (Substance Use Disorder) Registered Nurse 163WA0400X
Practice location
2456 E St, San Diego, CA 92102
Phone
(619) 503-7680
Enumerated
Jun 11, 2007
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 2456 E St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Nadia Lugue, L.V.NLicensed Vocational Nurse1831452432
  2. Tylline Morgan, LVNLicensed Vocational Nurse1689938227

Verify William Mazzarella in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Statewide context: the Medical Board of California reported 374 disciplinary actions in FY 2022-23. California discipline data →

Addiction (Substance Use Disorder) Registered Nurse providers in California

There are 163 addiction (substance use disorder) registered nurse records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 163 in California → Every provider in San Diego →

Other addiction (substance use disorder) registered nurse records in California

  1. Rachel AbdelSan Francisco, CA1538880737
  2. Michael AbrogarOakland, CA1568100303
  3. Omorogiuwa Adeneye, PMHNPLancaster, CA1770271280
  4. Raymund AlbanoRiverside, CA1568233161
  5. Janet Alvarez, BSN-RNRiverside, CA1396445409
  6. Stacy Anderson, RNOceanside, CA1144846064
  7. Henrietta Anibuko, RNSan Francisco, CA1871199539
  8. Michelle Aniceto, RNSalinas, CA1578768594
  9. Liliana AprezaAntioch, CA1396431045
  10. Gilbert Arellano, RNSan Francisco, CA1801745989

Common questions

What is William Mazzarella, COUNSELOR's NPI number?

William Mazzarella, COUNSELOR's National Provider Identifier (NPI) is 1770787111, issued on Jun 11, 2007. An NPI identifies a provider in billing; it is not a license.

Where is William Mazzarella, COUNSELOR located?

The NPPES record lists a practice address at 2456 E St, San Diego, CA, 92102. Phone: (619) 503-7680. Providers update this record themselves, so call before visiting.

How can I verify William Mazzarella, COUNSELOR's license?

Search the California board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.