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

MARK JOSEPH BRENNAN, DO

VASCULAR SURGERY

Medical school: PHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE

Graduated: 1994

NPI: 1174523443

Practice Locations (5)

UNITED HEALTH SERVICES HOSPITALS, INC.

10 -24 MITCHELL AVE

BINGHAMTON, NY 139031617

6077623131

UNITED HEALTH SERVICES HOSPITALS, INC.

54 MAIN ST

CANDOR, NY 137431619

6076597272

UNITED HEALTH SERVICES HOSPITALS, INC.

30 HARRISON ST

JOHNSON CITY, NY 137902161

6077638101

UNITED HEALTH SERVICES HOSPITALS, INC.

33 -57 HARRISON ST

JOHNSON CITY, NY 137902107

6077636101

CHENANGO MEMORIAL HOSPITAL INC

179 N BROAD ST, UHS SENIOR LIVING NORWICH

NORWICH, NY 138151019

6073374111

Source: CMS National Downloadable File, September 2026.

MARK BRENNAN, DO | HealthCareAtlasUSA