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 / MA

MARK SARNAK, MD

NEPHROLOGY

Medical school: COLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS

Graduated: 1993

Offers telehealth

NPI: 1982641502

Practice Locations (1)

PRATT MEDICAL GROUP INC

800 WASHIGTON ST

BOSTON, MA 021111552

6176365000

Source: CMS National Downloadable File, September 2026.

MARK SARNAK, MD | HealthCareAtlasUSA