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 / MD

JOHN P O BRIEN, CSW

CLINICAL SOCIAL WORKER

Graduated: 2002

NPI: 1700137940

Practice Locations (1)

9426 STEWARTOWN RD, 2F

GAITHERSBURG, MD 208791607

3012088900

Source: CMS National Downloadable File, September 2026.

JOHN O BRIEN, CSW | HealthCareAtlasUSA