HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CA

MARC NIELSEN, DO

FAMILY PRACTICE

Graduated: 2007

Also: EMERGENCY MEDICINE

NPI: 1265601207

Practice Locations (2)

SENECA HEALTHCARE DISTRICT

130 BRENTWOOD DR

CHESTER, CA 96020

5302582067

EASTERN PLUMAS HEALTH CARE DISTRICT

480 1ST AVE

PORTOLA, CA 961229405

5308326600

Source: CMS National Downloadable File, September 2026.

MARC NIELSEN, DO | HealthCareAtlasUSA