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

MS. Justine Mason Underhill, LCSW

Individual provider Clinical Social Worker · NPI 1942377957

MS. Justine Mason Underhill, LCSW is a Clinical Social Worker in San Francisco, California. Works from 3 locations. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

1001 Potrero Ave # 6B
San Francisco, CA 94110-3518
Phone: (628) 206-4444
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1100 Sanchez St, San Francisco, CA 94114-3825 — (415) 672-4700
  • 401 Parnassus Ave, San Francisco, CA 94143-2211 — (415) 476-7222

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence LCSW 24079 (CA)

Record details

NPI number1942377957
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorNo
NPI enumeratedNovember 29, 2006
Last updated in NPPESAugust 18, 2021
Certification dateAugust 18, 2021

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