Unilateral post-traumatic osteoarthritis, right knee

This code signifies osteoarthritis affecting the right knee that developed as a direct consequence of a prior injury to that knee. It indicates a degenerative joint disease specifically attributed to trauma, rather than primary osteoarthritis or other systemic causes.

Apply this code when documentation clearly links the patient's right knee osteoarthritis to a past traumatic event, such as a fracture, ligament tear, or meniscal injury. The medical record should explicitly state "post-traumatic osteoarthritis" of the right knee.

• Ensure documentation specifies "post-traumatic" and laterality (right knee).
• Do not use this code for primary osteoarthritis or osteoarthritis due to other specified causes.
• Consider sequencing this code after an external cause code if the original trauma is still being treated or is relevant to the current encounter.