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 / FL

JOHANNES K MARTENSSON, MD

GASTROENTEROLOGY

Graduated: 1975

Offers telehealth

NPI: 1417954298

Practice Locations (1)

6152 W CORPORATE OAKS DR

CRYSTAL RIVER, FL 344298722

3523448080

Source: CMS National Downloadable File, September 2026.

JOHANNES MARTENSSON, MD | HealthCareAtlasUSA