Maria Williamson, IMF
NPI 1811008121 · Marriage & Family Therapist · National City, CA
Maria Williamson, IMF is a Marriage & Family Therapist provider in National City, CA (NPI 1811008121).
Provider details
- NPI number
- 1811008121
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- IMF
- Sex
- Female
- Sole proprietor
- No
- License
- IMF41412 (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
19 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
- 2006-08-31
- Last updated
- 2007-07-08
Frequently asked questions
- What is Maria Williamson's NPI number?
- Maria Williamson's National Provider Identifier (NPI) is 1811008121, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maria Williamson's specialty?
- Maria Williamson is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Maria Williamson located?
- Maria Williamson's practice location on file with NPPES is 1840 Wilson Ave Ste C, National City, CA 91950-5515.
- What is Maria Williamson's phone number?
- The practice phone number listed in the NPPES registry for Maria Williamson is (619) 993-6394.
- Is Maria Williamson's NPI active?
- Yes — Maria Williamson's NPI (1811008121) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.