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 / NH

MARK K DETWEILER, MD

GASTROENTEROLOGY

Medical school: PENNSYLVANIA STATE UNIVERSITY COLLEGE OF MEDICINE

Graduated: 1979

NPI: 1548344583

Practice Locations (1)

1 B COMMONS DR, UNIT 9A

LONDONDERRY, NH 030533442

6038184712

Source: CMS National Downloadable File, September 2026.