Pathological fracture, unsp tibia and fibula, init for fx

This code signifies a bone fracture in either the tibia or fibula, or both, that occurred due to a pre-existing disease process rather than significant trauma. It indicates that the patient is receiving initial active treatment for this specific fracture. The exact bone (tibia or fibula) is not specified in the documentation.

Apply this code when documentation clearly states a pathological fracture of the lower leg, without specifying whether it's the tibia or fibula, or both. This is appropriate for the initial phase of treatment, such as surgical repair, casting, or initial evaluation in an emergency department. Supporting documentation would include physician notes detailing the pathological nature of the fracture and the unspecified location within the lower leg.

• Ensure documentation explicitly states "pathological fracture" and that the encounter is for initial treatment.
• If the specific bone (tibia or fibula) is identified, a more specific code from the M84.46- series should be used.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.