Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William Larkin, LCSW

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1629559299

William Larkin, LCSW is an Addiction (Substance Use Disorder) Counselor in Chino Hills, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2018
Specialties on file
2
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

4045 Bayberry Dr
Chino Hills, CA 91709-3311
Phone: (909) 680-8161
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 118024 (CA)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X

Record details

NPI number1629559299
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedAugust 22, 2018
Last updated in NPPESOctober 4, 2023
Certification dateOctober 4, 2023

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