William Larkin, LCSW
NPI 1629559299 · Clinical Social Worker · Chino Hills, CA
William Larkin, LCSW is a Clinical Social Worker provider in Chino Hills, CA (NPI 1629559299).
Provider details
- NPI number
- 1629559299
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-08-22
- Last updated
- 2023-10-04
- Certified
- 2023-10-04
Frequently asked questions
- What is William Larkin's NPI number?
- William Larkin's National Provider Identifier (NPI) is 1629559299, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Larkin's specialty?
- William Larkin is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William Larkin located?
- William Larkin's practice location on file with NPPES is 4045 Bayberry Dr, Chino Hills, CA 91709-3311.
- What is William Larkin's phone number?
- The practice phone number listed in the NPPES registry for William Larkin is (909) 680-8161.
- Is William Larkin's NPI active?
- Yes — William Larkin's NPI (1629559299) is active in the NPPES registry as of the last update on 2023-10-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.