Contusion of unspecified knee, sequela

This code represents a contusion, or bruise, of an unspecified knee that is now a sequela. This indicates a condition that is the late effect of an earlier injury, where the acute phase has passed, but the patient continues to experience residual symptoms or complications directly attributable to the initial knee contusion.

This code is appropriate when a patient presents with ongoing symptoms (e.g., pain, stiffness, limited range of motion, swelling) in an unspecified knee that are directly related to a previously sustained contusion. It should be used after the initial acute injury has resolved, and the patient is being treated for the chronic or residual effects.

• Always code the sequela first, followed by the specific residual condition if applicable (e.g., chronic pain).
• Ensure documentation clearly links the current symptoms to a past knee contusion and specifies the "sequela" nature of the presentation.
• Avoid using this code for acute contusions; those require different codes from the S80.0- series without the "S" seventh character.