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

Mr. Mark Robert Thielen, MFT

Individual provider Marriage & Family Therapist · NPI 1851545099

Mr. Mark Robert Thielen, MFT is a Marriage & Family Therapist in Grass Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2008
What do these letters mean?
MFT — Marriage and Family Therapist
A therapist who treats couples and families.

See every abbreviation used in this directory →

Practice location Address checks out

698 Whiting St Ste D
Grass Valley, CA 95945-7568
Phone: (530) 271-7266
Fax: (530) 477-7822
Show map & directions

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

Specialties & licences

Marriage & Family Therapist (primary) Taxonomy 106H00000X · Licence 45180 (CA)

Record details

NPI number1851545099
Entity typeIndividual (Type 1)
GenderMale
Credentials MFT
Sole proprietorYes
NPI enumeratedNovember 14, 2008
Last updated in NPPESNovember 14, 2008
Mailing address698 Whiting St., Suite D, Grass Valley, CA 95946

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