MP26-09 ACCURACY OF DIAGNOSTIC CODES IN A CLINICAL RESEARCH NETWORK TO IDENTIFY PRIMARY HYPEROXALURIA PATIENTS. (May 2022) - Ching, Christina; Dickinson, Kim; Razzaghi, Hanieh; Marchesani, Nicole; Augelli, Brian; Utidjian, Levon; Mucha, Lisa; Antunes, Nuno; Karafilidis, John; Yonekawa, Karyn; Coplen, Doug; Muneeruddin, Samina; et al.