External constriction, left knee, sequela

This code describes the long-term effects or complications arising from an external constriction injury to the left knee. It indicates that the initial injury, such as from a tight bandage, cast, or other external pressure, has resolved, but residual issues persist. These sequelae could include chronic pain, nerve damage, circulatory impairment, or functional limitations in the left knee.

Apply this code when documenting a patient presenting with a current condition that is a direct result of a past external constriction injury to their left knee. This is appropriate for follow-up encounters where the acute phase of the constriction has passed, but the patient continues to experience related symptoms or deficits. It signifies that the current problem is a late effect of the original trauma.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic pain, nerve palsy).
• Ensure documentation clearly links the current left knee condition to a prior external constriction injury.
• Do not use for acute external constriction injuries; those require codes from the initial encounter category.