left knee arthroscopy

left knee arthroscopy is performed under four portals, anterolateral, anteromedial, superolateral and poateromedial. The diagnostic arthroscopy was started placing the arthroscope in the anterolateral portal. There is a severe fibrosis and hypertrophy of the fat pad and grade 2 and 3 chrondromalacia of the femoral condyl. What is the CPT® code(s)