Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mrs. Grethel Leff, ASW

Individual provider Clinical Social Worker · NPI 1851692842

Mrs. Grethel Leff, ASW is a Clinical Social Worker in Pleasanton, California. Licensed in California. Registered with an NPI since 2010.

Licensed in
CA
In the registry since
2010

Practice location Address checks out

5354 Case Ave # 920
Pleasanton, CA 94566-8019
Phone: (925) 895-2661
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 28974 (CA)

Record details

NPI number1851692842
Entity typeIndividual (Type 1)
GenderFemale
Credentials ASW
Sole proprietorNo
NPI enumeratedNovember 8, 2010
Last updated in NPPESDecember 13, 2010

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