M23.6 - Other spontaneous disruption of ligament(s) of knee
M23.67 - Other spontaneous disruption of capsular ligament of knee
M23.671 - Other spontaneous disruption of capsular ligament of right knee
M23.672 - Other spontaneous disruption of capsular ligament of left knee
M23.679 - Other spontaneous disruption of capsular ligament of unspecified knee