Marimar Contreras Nieves, MD
NPI 1245767144 · Nephrology Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marimar Contreras Nieves, MD is a Nephrology Physician provider in Palo Alto, CA (NPI 1245767144).
Provider details
- NPI number
- 1245767144
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A176891 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
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.
Practice location
Mailing address
Additional practice locations (1)
- 300 Pasteur DrPalo Alto, CA 94304-2203Phone: (650) 723-4000
Registry dates
- Enumerated
- 2017-05-23
- Last updated
- 2026-04-15
- Certified
- 2026-04-15
Frequently asked questions
- What is Marimar Contreras Nieves's NPI number?
- Marimar Contreras Nieves's National Provider Identifier (NPI) is 1245767144, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marimar Contreras Nieves's specialty?
- Marimar Contreras Nieves is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Marimar Contreras Nieves located?
- Marimar Contreras Nieves's practice location on file with NPPES is 795 El Camino Real, Palo Alto, CA 94301-2302.
- What is Marimar Contreras Nieves's phone number?
- The practice phone number listed in the NPPES registry for Marimar Contreras Nieves is (650) 853-2917.
- Does Marimar Contreras Nieves accept Medicare?
- Marimar Contreras Nieves is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marimar Contreras Nieves's NPI active?
- Yes — Marimar Contreras Nieves's NPI (1245767144) is active in the NPPES registry as of the last update on 2026-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.