Marimar Contreras Nieves, MD
NPI 1245767144ActiveIndividual· Internal Medicine, Nephrology· Palo Alto, CA
Internal Medicine, Nephrology (MD) with Stanford Health Care, practicing in Palo Alto, California. Medicare paid $3,510 for services to 16 patients in 2024. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1245767144 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 23, 2017 |
| Last updated in NPPES | Apr 15, 2026 |
| Certified by provider | Apr 15, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 110906 | GA |
| Internal Medicine, Nephrology | 207RN0300X | A176891 | CA |
| Internal Medicine | 207R00000X | A176891 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (CA); Practitioner - Nephrology (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 16 |
|---|---|
| Services billed | 22 across 2 procedure codes |
| Paid by Medicare | $3,510 |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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