S83.409 Sprain of unspecified collateral ligament of unspecified kneeNon-billable ICD-10-CM code.
M23 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.-)")S83.401S Sprain of unspecified collateral ligament of right knee, sequelaS83.402 Sprain of unspecified collateral ligament of left kneeS83.402A Sprain of unspecified collateral ligament of left knee, initial encounterS83.402D Sprain of unspecified collateral ligament of left knee, subsequent encounterS83.402S Sprain of unspecified collateral ligament of left knee, sequelaS83.409 Sprain of unspecified collateral ligament of unspecified knee (this code)S83.409A Sprain of unspecified collateral ligament of unspecified knee, initial encounterS83.409D Sprain of unspecified collateral ligament of unspecified knee, subsequent encounterS83.409S Sprain of unspecified collateral ligament of unspecified knee, sequelaS83.41 Sprain of medial collateral ligament of kneeS83.411 Sprain of medial collateral ligament of right knee