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 / PA

JOHN J MAST, MD

GERIATRIC MEDICINE

Medical school: INDIANA UNIVERSITY SCHOOL OF MEDICINE

Graduated: 1996

Also: FAMILY PRACTICE

NPI: 1154392371

Practice Locations (5)

LANCASTER GENERAL HOSPITAL

2100 HARRISBURG PIKE

LANCASTER, PA 176012644

7175443113

LANCASTER GENERAL HOSPITAL

2102 HARRISBURG PIKE

LANCASTER, PA 176012644

7175443113

LANCASTER GENERAL HOSPITAL

2108 HARRISBURG PIKE, SUITE 315

LANCASTER, PA 176012644

7175443555

LANCASTER GENERAL HOSPITAL

2112 HARRISBURG PIKE

LANCASTER, PA 176012644

LANCASTER GENERAL HOSPITAL

317 CHESTNUT ST

QUARRYVILLE, PA 175661184

7175443555

Source: CMS National Downloadable File, September 2026.

JOHN MAST, MD | HealthCareAtlasUSA