Acute on chr slip upper fem epiphy, unsp stability, l hip

This code signifies an acute worsening of a pre-existing, long-standing slipped upper femoral epiphysis (SUFE) affecting the left hip, where the stability of the epiphysis is not specified. SUFE involves a displacement of the femoral head from the femoral neck through the growth plate, typically occurring in adolescents. "Acute on chronic" indicates a sudden, severe exacerbation of a previously stable or mildly symptomatic slip.

Use this code when documentation clearly indicates an acute presentation of a chronic left hip SUFE, without specifying whether the slip is stable or unstable. This is often supported by imaging reports (e.g., X-rays, MRI) showing both chronic changes and acute displacement, along with clinical notes describing a sudden onset of pain or functional limitation in a patient with a known history of SUFE.

• Ensure documentation specifies "acute on chronic" and the laterality (left hip).
• Avoid using this code if the stability (stable vs. unstable) of the slip is clearly documented; instead, choose a more specific code.
• Distinguish from acute traumatic slips, which would be coded differently.