Marcia Byrnes, RN, FNP
NPI 1801035043 · Family Nurse Practitioner · San Rafael, CA
Marcia Byrnes, RN, FNP is a Family Nurse Practitioner provider in San Rafael, CA (NPI 1801035043).
Provider details
- NPI number
- 1801035043
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN, FNP
- Sex
- Female
- Sole proprietor
- Yes
- License
- 236717 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
- 2009-02-11
- Last updated
- 2009-02-11
Frequently asked questions
- What is Marcia Byrnes's NPI number?
- Marcia Byrnes's National Provider Identifier (NPI) is 1801035043, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcia Byrnes's specialty?
- Marcia Byrnes is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcia Byrnes located?
- Marcia Byrnes's practice location on file with NPPES is 16 Ritter St, San Rafael, CA 94901-3323.
- What is Marcia Byrnes's phone number?
- The practice phone number listed in the NPPES registry for Marcia Byrnes is (415) 457-8182.
- Is Marcia Byrnes's NPI active?
- Yes — Marcia Byrnes's NPI (1801035043) is active in the NPPES registry as of the last update on 2009-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.