Oth spon disrupt of posterior cruciate ligament of unsp knee

This code signifies a non-traumatic tear or rupture of the posterior cruciate ligament (PCL) in a knee where the specific side (left or right) is not documented. This condition typically results in knee instability and pain, often without a clear acute injury event.

Apply this code when the medical record explicitly states a spontaneous disruption of the posterior cruciate ligament, and the laterality of the affected knee is not specified. Documentation should indicate a non-traumatic etiology, such as degenerative changes or an insidious onset of symptoms.

• Avoid using this code if the laterality (left or right knee) is documented; instead, select the more specific M23.621 or M23.622.
• Do not use this code for traumatic PCL injuries; those are classified under S83.51-.
• Ensure the documentation clearly differentiates "spontaneous" (non-traumatic) from traumatic disruptions to prevent miscoding.