Pathological fracture, unsp hand, subs for fx w malunion

This diagnosis code signifies a fracture in an unspecified bone of the hand that occurred due to an underlying disease process, rather than trauma. The fracture has previously been treated, but has healed improperly, resulting in a malunion. This code is used when the patient is receiving active treatment for the malunion.

Apply this code for patients presenting for follow-up care, rehabilitation, or further surgical intervention specifically addressing a malunited pathological fracture of the hand. Documentation should clearly state "pathological fracture," specify the hand (even if unspecified bone), and confirm the presence of malunion during a subsequent encounter.

• Ensure documentation explicitly states "pathological fracture" to differentiate from traumatic fractures.
• Verify the encounter is for active treatment of the malunion, not just routine follow-up of a healed fracture.
• Do not use this code if the specific hand bone is identified; instead, use a more specific code from the M84.44- series.