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 / DC

STEPHEN SEBASTIAN, MD

INTERNAL MEDICINE

Graduated: 2018

NPI: 1386206449

Practice Locations (2)

MEDSTAR MEDICAL GROUP II LLC

1145 19TH ST NW, 311 MMG AT 19TH STREET NW

WASHINGTON, DC 200363735

2024292401

RIVERSIDE PHYSICIAN SERVICES INC

20480 MARKET ST

ONANCOCK, VA 234174309

7573022342

Source: CMS National Downloadable File, September 2026.

STEPHEN SEBASTIAN, MD | HealthCareAtlasUSA