Path fx in oth disease, unsp foot, subs for fx w malunion

This code signifies a fracture of an unspecified foot that occurred due to an underlying disease process, not from trauma. The patient is in a subsequent phase of care, and the fracture is healing incorrectly, resulting in a malunion. This indicates ongoing management for a complicated healing process.

Use this code for follow-up encounters where a patient is being treated for a pathological fracture of the foot that has healed in a misaligned position. Documentation should clearly state the presence of a malunion and that the fracture was caused by an underlying systemic disease (e.g., osteoporosis, cancer, Paget's disease), not a traumatic event.

• Ensure documentation specifies "pathological fracture" and identifies the underlying disease if known (code the disease first).
• Verify the encounter type is "subsequent" and that "malunion" is explicitly documented for the fracture.
• Do not use this code for nonunion (M84.4-) or for fractures due to trauma (S92.- with 7th character for malunion).