About Maziar Mahjoobi, DO. Maziar Mahjoobi, DO is an interventional cardiologist, internal medicine doctor, cardiovascular disease doctor, and primary care doctor who practices at Texomacare Specialty Physicians located at 5012 S Us Highway 75 in Suite 100 in Denison, TX 75020 (Grayson County). Dr. Maziar Mahjoobi has 14 years of experience in ....