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 S MCMAHON, MD

ORTHOPEDIC SURGERY

Medical school: HARVARD MEDICAL SCHOOL

Graduated: 1986

NPI: 1750437521

Practice Locations (1)

876 PARK AVE

NEW YORK, NY 100751832

2127171405

Source: CMS National Downloadable File, September 2026.