Path fracture in oth disease, l ulna, subs for fx w nonunion

This code signifies a fracture of the left ulna that occurred due to an underlying medical condition, not from trauma alone. It specifically indicates that the fracture has not healed properly (nonunion) and the patient is receiving ongoing treatment for this complication.

Apply this code for follow-up encounters when a patient presents with a left ulnar fracture caused by a disease process (e.g., osteoporosis, bone tumor, metabolic bone disease) and the fracture has failed to unite. Documentation should clearly state "pathological fracture," "left ulna," "nonunion," and indicate a "subsequent encounter" for treatment.

• Always sequence the underlying disease causing the pathological fracture first.
• Ensure documentation specifies "nonunion" for this specific complication; malunion is a different code.
• Verify laterality (left ulna) and encounter type (subsequent) are explicitly documented to support this code.