Ana Leon Williams
NPI 1598213779 · Marriage & Family Therapist · San Mateo, CA
Ana Leon Williams is a Marriage & Family Therapist provider in San Mateo, CA (NPI 1598213779).
Provider details
- NPI number
- 1598213779
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Behavioral Health & Social Service Providers
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 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
- 2016-09-15
- Last updated
- 2022-02-24
- Certified
- 2022-02-24
Frequently asked questions
- What is Ana Leon Williams's NPI number?
- Ana Leon Williams's National Provider Identifier (NPI) is 1598213779, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ana Leon Williams's specialty?
- Ana Leon Williams is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Ana Leon Williams located?
- Ana Leon Williams's practice location on file with NPPES is 501 1st Ave Ste 1, San Mateo, CA 94401-3476.
- What is Ana Leon Williams's phone number?
- The practice phone number listed in the NPPES registry for Ana Leon Williams is (650) 989-0403.
- Is Ana Leon Williams's NPI active?
- Yes — Ana Leon Williams's NPI (1598213779) is active in the NPPES registry as of the last update on 2022-02-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.