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

MARK BYRNE, MD

CARDIOVASCULAR DISEASE (CARDIOLOGY)

Medical school: ILLINOIS MEDICAL COLLEGE

Graduated: 1989

Also: INTERNAL MEDICINE

Offers telehealth

NPI: 1962411272

Practice Locations (1)

BRENNAN MEDICAL CORPORATION

30 BRENNAN ST

WATSONVILLE, CA 950764303

8317680220

Source: CMS National Downloadable File, September 2026.

MARK BYRNE, MD | HealthCareAtlasUSA