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

Individual provider Clinical Social Worker · NPI 1295939338

Holly Hammack, LCSW is a Clinical Social Worker in Fontana, California. Qualified in 1980, 46 years ago. Practices with Mountain View Behavioral Health Inc, a 5-clinician group and offers telehealth. Licensed in California.

Years since qualifying
46
Licensed in
CA
In the registry since
2007
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

9961 Sierra Ave
Fontana, CA 92335-6720
Phone: (909) 427-3910
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence LCS10042 (CA)

Record details

NPI number1295939338
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorNo
NPI enumeratedJune 13, 2007
Last updated in NPPESSeptember 15, 2008
Mailing address9961 Sierra Ave, Fontana, CA 92335-6720

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 1980 (46 years in practice)
Group practice Mountain View Behavioral Health Inc — 5 clinicians
Accepts Medicare assignment Not indicated
TelehealthOffers telehealth services

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