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

Mrs. Nancy Elizabeth Matthiessen, MAS, RD, CSP

Individual provider Registered Dietitian · NPI 1922556315

Mrs. Nancy Elizabeth Matthiessen, MAS, RD, CSP is a Registered Dietitian in San Francisco, California. Registered with an NPI since 2016.

In the registry since
2016
What do these letters mean?
RD — Registered Dietitian
A credentialed nutrition professional.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1855 4th St
San Francisco, CA 94143-2350
Phone: (415) 476-1342
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Registered Dietitian (primary) Taxonomy 133V00000X

Record details

NPI number1922556315
Entity typeIndividual (Type 1)
GenderFemale
Credentials MAS , RD , CSP
Sole proprietorNo
NPI enumeratedSeptember 14, 2016
Last updated in NPPESSeptember 14, 2016

Other providers in San Francisco