Alfonso Diaz
NPI 1528787355 · Marriage & Family Therapist · Fairfield, CA
Alfonso Diaz is a Marriage & Family Therapist provider in Fairfield, CA (NPI 1528787355).
Provider details
- NPI number
- 1528787355
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 141546 (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
3 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
- 2022-08-24
- Last updated
- 2023-09-20
- Certified
- 2023-09-20
Frequently asked questions
- What is Alfonso Diaz's NPI number?
- Alfonso Diaz's National Provider Identifier (NPI) is 1528787355, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alfonso Diaz's specialty?
- Alfonso Diaz is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Alfonso Diaz located?
- Alfonso Diaz's practice location on file with NPPES is 4820 Business Center Dr Ste 210, Fairfield, CA 94534-1696.
- What is Alfonso Diaz's phone number?
- The practice phone number listed in the NPPES registry for Alfonso Diaz is (707) 224-8266.
- Is Alfonso Diaz's NPI active?
- Yes — Alfonso Diaz's NPI (1528787355) is active in the NPPES registry as of the last update on 2023-09-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.