William Little
NPI 1619303146 · Addiction (Substance Use Disorder) Counselor · San Mateo, CA
William Little is a Addiction (Substance Use Disorder) Counselor provider in San Mateo, CA (NPI 1619303146).
Provider details
- NPI number
- 1619303146
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
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
12 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
- 2013-09-16
- Last updated
- 2013-09-16
Frequently asked questions
- What is William Little's NPI number?
- William Little's National Provider Identifier (NPI) is 1619303146, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Little's specialty?
- William Little is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is William Little located?
- William Little's practice location on file with NPPES is 2251 Palm Ave, San Mateo, CA 94403-1814.
- What is William Little's phone number?
- The practice phone number listed in the NPPES registry for William Little is (650) 389-4346.
- Is William Little's NPI active?
- Yes — William Little's NPI (1619303146) is active in the NPPES registry as of the last update on 2013-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.