Meet Dr. George Mammen, MD, Interventional Cardiology in 10496 Old Katy 130 Hou 77043 George P Mammen 1588629497 MSOW. ... Patient Portal Login; Search Close. All Services ... Accepting New Patients (713) 464-2928 Insurance Accepted; Locations and Appointments. Get Directions. 10496 Old Katy Rd, Ste 130, Houston, TX 77043 (713) 464-2928 ....