Ellen Zemarkowitz, LCSW
NPI 1053252957 · Clinical Social Worker · Palo Alto, CA
Ellen Zemarkowitz, LCSW is a Clinical Social Worker provider in Palo Alto, CA (NPI 1053252957).
Provider details
- NPI number
- 1053252957
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- LCSW89459 (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
Under 1 yr in 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
- 2026-04-03
- Last updated
- 2026-04-03
- Certified
- 2026-04-03
Frequently asked questions
- What is Ellen Zemarkowitz's NPI number?
- Ellen Zemarkowitz's National Provider Identifier (NPI) is 1053252957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ellen Zemarkowitz's specialty?
- Ellen Zemarkowitz is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Ellen Zemarkowitz located?
- Ellen Zemarkowitz's practice location on file with NPPES is 725 Welch Rd, Palo Alto, CA 94304-1601.
- What is Ellen Zemarkowitz's phone number?
- The practice phone number listed in the NPPES registry for Ellen Zemarkowitz is (650) 374-8649.
- Is Ellen Zemarkowitz's NPI active?
- Yes — Ellen Zemarkowitz's NPI (1053252957) is active in the NPPES registry as of the last update on 2026-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.