Ruth Armstrong, NP
NPI 1558419291 · Obstetrics & Gynecology Nurse Practitioner · San Francisco, CA
Ruth Armstrong, NP is a Obstetrics & Gynecology Nurse Practitioner provider in San Francisco, CA (NPI 1558419291).
Provider details
- NPI number
- 1558419291
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- RN320167 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% 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
- 2007-01-08
- Last updated
- 2025-09-11
Frequently asked questions
- What is Ruth Armstrong's NPI number?
- Ruth Armstrong's National Provider Identifier (NPI) is 1558419291, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ruth Armstrong's specialty?
- Ruth Armstrong is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Ruth Armstrong located?
- Ruth Armstrong's practice location on file with NPPES is 2727 Mariposa St Ste 100, San Francisco, CA 94110-1400.
- What is Ruth Armstrong's phone number?
- The practice phone number listed in the NPPES registry for Ruth Armstrong is (415) 437-3000.
- Is Ruth Armstrong's NPI active?
- Yes — Ruth Armstrong's NPI (1558419291) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.