Pathological dislocation of left knee, NEC

This code signifies a spontaneous or atraumatic dislocation of the left knee joint, meaning the bones of the knee have separated from their normal alignment without significant external force or injury. This type of dislocation is typically due to an underlying disease process weakening the joint structures, rather than an acute traumatic event.

Apply this code when documentation clearly indicates a non-traumatic dislocation of the left knee. This often occurs in patients with conditions like inflammatory arthritis, neuropathic arthropathy, or significant joint laxity due to systemic disorders. The physician's notes should specify "pathological dislocation" or describe a dislocation occurring without trauma.

• Differentiate from traumatic dislocations (S83.0- series) which involve an acute injury.
• Always code the underlying systemic disease or condition causing the pathological dislocation first, if known.
• Ensure the laterality (left knee) is explicitly documented to support this specific code.