822.1
ICD-9-CMThis code signifies a fracture of the kneecap where the skin and underlying soft tissues are broken, exposing the bone to the external environment. This type of injury carries a higher risk of infection compared to closed fractures due to the direct communication with the outside.
Apply this code when documentation explicitly states an "open" or "compound" fracture of the patella. This typically occurs due to high-energy trauma, such as direct impact to the knee with associated skin laceration. Physician notes should clearly describe the open nature of the wound and its relation to the fracture.
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