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

JEFFREY C.G. MARK, MD

GASTROENTEROLOGY

Medical school: UNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)

Graduated: 1992

Also: INTERNAL MEDICINE

NPI: 1487603155

Practice Locations (1)

111 DEERWOOD RD, SUITE 168

SAN RAMON, CA 945834409

9258182785

Source: CMS National Downloadable File, September 2026.

JEFFREY MARK, MD | HealthCareAtlasUSA