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

MARK MATTAR, MD

GASTROENTEROLOGY

Graduated: 2004

Also: INTERNAL MEDICINE

Offers telehealth

NPI: 1841401031

Practice Locations (3)

MEDSTAR MEDICAL GROUP II LLC

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

WASHINGTON, DC 200363735

2024292401

MEDSTAR MEDICAL GROUP II LLC

3800 RESERVOIR RD NW

WASHINGTON, DC 200072113

7035581400

MEDSTAR MEDICAL GROUP II LLC

23511 HOLLYWOOD RD, SUITE 2

LEONARDTOWN, MD 206505833

3019970611

Source: CMS National Downloadable File, September 2026.

MARK MATTAR, MD | HealthCareAtlasUSA