Sprain of unsp collateral ligament of unsp knee, sequela

This code signifies a long-term complication or late effect resulting from a previous sprain of an unspecified collateral ligament in an unspecified knee. It indicates that the initial injury has resolved, but the patient is now experiencing residual issues directly attributable to that past sprain.

Apply this code when documenting a patient presenting with chronic pain, instability, stiffness, or other persistent symptoms in the knee, and the medical record clearly links these symptoms to a prior, unspecified collateral ligament sprain. This is appropriate when the acute phase of the original injury has passed, and the current encounter addresses the lasting consequences.

• Only use this code when the documentation explicitly states "sequela" or "late effect" of a prior sprain.
• Avoid using this code for acute or subacute sprains; those require codes from the initial encounter or subsequent encounter categories.
• Ensure the medical record supports the "unspecified" nature of both the collateral ligament and the knee if more specific information is not available.