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

Mr. Mark Edward Holderbach, MSW, LCSW

Individual provider Clinical Social Worker · NPI 1649397183

Mr. Mark Edward Holderbach, MSW, LCSW is a Clinical Social Worker in Gresham, Oregon. Licensed in Oregon. Registered with an NPI since 2007.

Licensed in
OR
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

4101 NE Division St
Gresham, OR 97030-4617
Phone: (503) 666-6575
Fax: (503) 666-4047
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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 L3497 (OR)

Record details

NPI number1649397183
Entity typeIndividual (Type 1)
GenderMale
Credentials MSW , LCSW
Sole proprietorNo
NPI enumeratedMarch 22, 2007
Last updated in NPPESJuly 9, 2007

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