Marcia Spencer, NP
NPI 1891281051 · Family Nurse Practitioner · San Mateo, CA
Marcia Spencer, NP is a Family Nurse Practitioner provider in San Mateo, CA (NPI 1891281051).
Provider details
- NPI number
- 1891281051
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 95009085 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Simvastatin | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 1850 Sullivan Ave Ste 150Daly City, CA 94015-2230Phone: (650) 991-5880
Registry dates
- Enumerated
- 2018-07-10
- Last updated
- 2021-09-10
- Certified
- 2021-09-10
Frequently asked questions
- What is Marcia Spencer's NPI number?
- Marcia Spencer's National Provider Identifier (NPI) is 1891281051, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcia Spencer's specialty?
- Marcia Spencer is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcia Spencer located?
- Marcia Spencer's practice location on file with NPPES is 100 S San Mateo Dr, San Mateo, CA 94401-3805.
- What is Marcia Spencer's phone number?
- The practice phone number listed in the NPPES registry for Marcia Spencer is (650) 696-5034.
- Is Marcia Spencer's NPI active?
- Yes — Marcia Spencer's NPI (1891281051) is active in the NPPES registry as of the last update on 2021-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.