Marimar Contreras Nieves, MD
Nephrology Physician · Palo Alto, CA
Marimar Contreras Nieves, MD is a nephrology physician with a practice address in Palo Alto, California, and NPI 1245767144, issued on May 23, 2017. Check the license (California A176891, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marimar Contreras Nieves
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License numbers
- A176891 CA
110906 GA
Self-reported in NPPES; status is on the state search - Practice location
- 795 EL Camino Real, Palo Alto, CA 94301
- Phone
- (650) 853-2917
- Enumerated
- May 23, 2017
- Record last updated
- Apr 15, 2026
- Medicare enrollment
- Enrolled (PECOS I20240620002614); accepts Medicare assignment
- Medical or professional school
- University Of Puerto Rico School Of Medicine, 2019
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 795 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nana Efua Adabie, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1437647732
- Amy Adams, M.D.Dermatology Physician1679643928
- William Adams, DPMFoot & Ankle Surgery Podiatrist1447487830
Verify Marimar Contreras Nieves in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A176891Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Marimar Contreras Nieves among 1,468 nephrology physician records in California
Marimar Contreras Nieves, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 91% of them.
- NPI issued2017 · 91% of these records are older, 7% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2019 · median 2001 among the 1,128 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Palo Alto → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Luis Alvarez, MDPalo Alto, CA 943011487685368
- Toby Gottheiner, MDPalo Alto, CA 943011255362539
- Graham Rodwell, MDPalo Alto, CA 943011922077890
- Subramanian Sivarajan, M.D.Palo Alto, CA 943011154310951
- Kaleb Thomas, MDPalo Alto, CA 943011184280851
- Nidharshan AnandasivamPalo Alto, CA 943041255995239
- Andrew Koren, M.D.Palo Alto, CA 943041972676872
- Yiming Lit, M.D.Palo Alto, CA 943041366544082
Common questions
What is Marimar Contreras Nieves, MD's NPI number?
Marimar Contreras Nieves, MD's National Provider Identifier (NPI) is 1245767144, issued on May 23, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Marimar Contreras Nieves, MD located?
The NPPES record lists a practice address at 795 EL Camino Real, Palo Alto, CA, 94301. Phone: (650) 853-2917. Providers update this record themselves, so call before visiting.
How can I verify Marimar Contreras Nieves, MD's license?
NPPES lists California license number A176891, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.