Catharine Clark-Sayles, M.D.
NPI 1518952860 · Internal Medicine Physician · Greenbrae, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catharine Clark-Sayles, M.D. is a Internal Medicine Physician provider in Greenbrae, CA (NPI 1518952860).
Provider details
- NPI number
- 1518952860
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- G49182 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2005-09-13
- Last updated
- 2009-06-23
Frequently asked questions
- What is Catharine Clark-Sayles's NPI number?
- Catharine Clark-Sayles's National Provider Identifier (NPI) is 1518952860, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catharine Clark-Sayles's specialty?
- Catharine Clark-Sayles is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Catharine Clark-Sayles located?
- Catharine Clark-Sayles's practice location on file with NPPES is 1341 S Eliseo Dr, Greenbrae, CA 94904-2000.
- What is Catharine Clark-Sayles's phone number?
- The practice phone number listed in the NPPES registry for Catharine Clark-Sayles is (415) 464-8176.
- Does Catharine Clark-Sayles accept Medicare?
- Catharine Clark-Sayles is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catharine Clark-Sayles's NPI active?
- Yes — Catharine Clark-Sayles's NPI (1518952860) is active in the NPPES registry as of the last update on 2009-06-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.