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

Joanna M Siefert

Individual provider Mental Health Counselor · NPI 1831347269

Joanna M Siefert is a Mental Health Counselor in Vallejo, California. Registered with an NPI since 2008.

In the registry since
2008

Practice location Address checks out

1027 Alabama St
Vallejo, CA 94590-4511
Phone: (707) 558-1600
Show map & directions

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

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X

Record details

NPI number1831347269
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedAugust 27, 2008
Last updated in NPPESAugust 27, 2008

Other providers in Vallejo