Path fx in neopltc disease, oth site, subs for fx w nonunion

This code signifies a fracture that has occurred due to an underlying neoplastic (cancerous) process, specifically affecting a site other than those more commonly specified (e.g., vertebra, humerus, femur, tibia, fibula, radius, ulna, ankle, foot, hand). The fracture has not healed properly, resulting in a nonunion, and the patient is receiving ongoing care for this unhealed fracture.

Apply this code when documentation indicates a patient with a known malignancy has sustained a fracture at an unspecified or less common anatomical site (e.g., scapula, clavicle, pelvis) due to the cancer, and the fracture has failed to unite. This code is appropriate for follow-up encounters where the nonunion is being actively managed, such as for cast changes, physical therapy, or surgical planning for nonunion repair.

• Always sequence the underlying malignancy code first, followed by this code.
• Ensure documentation clearly specifies "nonunion" and the "other specified site" to support this code.
• Distinguish from M84.4- (pathological fracture, not elsewhere classified) which does not specify neoplastic disease as the cause.