S83.4 Sprain of collateral ligament of kneeNon-billable header with 3 child codes.
S83.40 Sprain of unspecified collateral ligament of kneeS83.41 Sprain of medial collateral ligament of kneeS83.42 Sprain of lateral collateral ligament of kneeM23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")S86 Injury of muscle, fascia and tendon at lower leg level ("sprain of joints and ligaments of knee (S83.-)")S83.31XS Tear of articular cartilage of right knee, current, sequelaS83.32 Tear of articular cartilage of left knee, currentS83.32XA Tear of articular cartilage of left knee, current, initial encounterS83.32XD Tear of articular cartilage of left knee, current, subsequent encounterS83.32XS Tear of articular cartilage of left knee, current, sequelaS83.4 Sprain of collateral ligament of knee (this code)S83.40 Sprain of unspecified collateral ligament of kneeS83.401 Sprain of unspecified collateral ligament of right kneeS83.401A Sprain of unspecified collateral ligament of right knee, initial encounterS83.401D Sprain of unspecified collateral ligament of right knee, subsequent encounterS83.401S Sprain of unspecified collateral ligament of right knee, sequela