Xavier Diaz, COUNSELOR
NPI 1821551466 · Addiction (Substance Use Disorder) Counselor · Fairfield, CA
Xavier Diaz, COUNSELOR is a Addiction (Substance Use Disorder) Counselor provider in Fairfield, CA (NPI 1821551466).
Provider details
- NPI number
- 1821551466
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- COUNSELOR
- Sex
- Male
- Sole proprietor
- Yes
- License
- R1341600319 (CA)
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
7 yrs in NPPES registry
- Profile completeness38% of score
100% 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
- 2019-04-10
- Last updated
- 2019-04-10
Frequently asked questions
- What is Xavier Diaz's NPI number?
- Xavier Diaz's National Provider Identifier (NPI) is 1821551466, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Xavier Diaz's specialty?
- Xavier Diaz is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Xavier Diaz located?
- Xavier Diaz's practice location on file with NPPES is 1143 Missouri St, Fairfield, CA 94533-6007.
- What is Xavier Diaz's phone number?
- The practice phone number listed in the NPPES registry for Xavier Diaz is (707) 435-9911.
- Is Xavier Diaz's NPI active?
- Yes — Xavier Diaz's NPI (1821551466) is active in the NPPES registry as of the last update on 2019-04-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.