Harriett Matthews
NPI 1194947812 · Addiction (Substance Use Disorder) Counselor · Brentwood, CA
Harriett Matthews is a Addiction (Substance Use Disorder) Counselor provider in Brentwood, CA (NPI 1194947812).
Provider details
- NPI number
- 1194947812
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- Yes
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
19 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
- 2007-05-03
- Last updated
- 2008-02-05
Frequently asked questions
- What is Harriett Matthews's NPI number?
- Harriett Matthews's National Provider Identifier (NPI) is 1194947812, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Harriett Matthews's specialty?
- Harriett Matthews is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Harriett Matthews located?
- Harriett Matthews's practice location on file with NPPES is 9100 Brentwood Blvd, Brentwood, CA 94513-4000.
- What is Harriett Matthews's phone number?
- The practice phone number listed in the NPPES registry for Harriett Matthews is (925) 809-7920.
- Is Harriett Matthews's NPI active?
- Yes — Harriett Matthews's NPI (1194947812) is active in the NPPES registry as of the last update on 2008-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.