Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. Mark W. Bontrager, MSW, LCSW

Individual provider Clinical Social Worker · NPI 1801946785

Mr. Mark W. Bontrager, MSW, LCSW is a Clinical Social Worker in Napa, California. Licensed in California. Registered with an NPI since 2007.

Licensed in
CA
In the registry since
2007
What do these letters mean?
MSW — Master of Social Work
The graduate degree in social work.
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

1801 Oak St
Napa, CA 94559-2337
Phone: (707) 224-8266
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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 23579 (CA)

Record details

NPI number1801946785
Entity typeIndividual (Type 1)
GenderMale
Credentials MSW , LCSW
Sole proprietorNo
NPI enumeratedJanuary 11, 2007
Last updated in NPPESSeptember 25, 2015

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