Marcia Ewing, LCSW
NPI 1629789888 · Clinical Social Worker · San Mateo, CA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcia Ewing, LCSW is a Clinical Social Worker provider in San Mateo, CA (NPI 1629789888).
Provider details
- NPI number
- 1629789888
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- LCSW94246 (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
- 2022-12-08
- Last updated
- 2025-03-18
- Certified
- 2025-03-18
Frequently asked questions
- What is Marcia Ewing's NPI number?
- Marcia Ewing's National Provider Identifier (NPI) is 1629789888, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcia Ewing's specialty?
- Marcia Ewing is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Marcia Ewing located?
- Marcia Ewing's practice location on file with NPPES is 1950 Alameda De Las Pulgas, San Mateo, CA 94403-1222.
- What is Marcia Ewing's phone number?
- The practice phone number listed in the NPPES registry for Marcia Ewing is (650) 573-2541.
- Does Marcia Ewing accept Medicare?
- Marcia Ewing is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcia Ewing's NPI active?
- Yes — Marcia Ewing's NPI (1629789888) is active in the NPPES registry as of the last update on 2025-03-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.