Nancy Matthiessen, MAS, RD, CSP
NPI 1922556315 · Registered Dietitian · San Francisco, CA
Nancy Matthiessen, MAS, RD, CSP is a Registered Dietitian provider in San Francisco, CA (NPI 1922556315).
Provider details
- NPI number
- 1922556315
- Entity type
- Individual
- Primary specialty
- Registered DietitianDietary & Nutritional Service Providers
- Credential
- MAS, RD, CSP
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Dietary & Nutritional Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-09-14
- Last updated
- 2016-09-14
Frequently asked questions
- What is Nancy Matthiessen's NPI number?
- Nancy Matthiessen's National Provider Identifier (NPI) is 1922556315, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Matthiessen's specialty?
- Nancy Matthiessen is listed in the NPPES registry with a primary specialty of Registered Dietitian (Dietary & Nutritional Service Providers).
- Where is Nancy Matthiessen located?
- Nancy Matthiessen's practice location on file with NPPES is 1855 4th St, San Francisco, CA 94143-2350.
- What is Nancy Matthiessen's phone number?
- The practice phone number listed in the NPPES registry for Nancy Matthiessen is (415) 476-1342.
- Is Nancy Matthiessen's NPI active?
- Yes — Nancy Matthiessen's NPI (1922556315) is active in the NPPES registry as of the last update on 2016-09-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.