DHA Endoscopy is a state-of-the-art outpatient endoscopy center developed in order to provide the highest quality, most cost-effective care in a safe, comfortable, convenient and patient-focused outpatient setting. DHA Endoscopy is located on Montvale Avenue in Stoneham with easy access from Routes 93 and 128.Clinicians & Administrators‧Home‧Locations‧Services‧New Patients‧Contact Us.