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 / NY

JAN CLAASSEN, MD

CRITICAL CARE (INTENSIVISTS)

Graduated: 1998

Also: NEUROLOGY

NPI: 1073649497

Practice Locations (1)

TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

51 W 51ST ST

NEW YORK, NY 100196113

2123265705

Source: CMS National Downloadable File, September 2026.

JAN CLAASSEN, MD | HealthCareAtlasUSA