Diana Matthiessen, ASW
NPI 1932986916 · Clinical Social Worker · Santa Monica, CA
Diana Matthiessen, ASW is a Clinical Social Worker provider in Santa Monica, CA (NPI 1932986916).
Provider details
- NPI number
- 1932986916
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- ASW
- Sex
- Female
- Sole proprietor
- No
- License
- 122238 (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
2 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
- 2023-09-12
- Last updated
- 2025-10-14
- Certified
- 2025-10-14
Frequently asked questions
- What is Diana Matthiessen's NPI number?
- Diana Matthiessen's National Provider Identifier (NPI) is 1932986916, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Matthiessen's specialty?
- Diana Matthiessen is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Diana Matthiessen located?
- Diana Matthiessen's practice location on file with NPPES is 3205 Ocean Park Blvd Ste 250, Santa Monica, CA 90405-3239.
- What is Diana Matthiessen's phone number?
- The practice phone number listed in the NPPES registry for Diana Matthiessen is (310) 488-5850.
- Is Diana Matthiessen's NPI active?
- Yes — Diana Matthiessen's NPI (1932986916) is active in the NPPES registry as of the last update on 2025-10-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.