Path fx in oth dis, unsp ulna & rad, subs for fx w nonunion

This code signifies a pathological fracture of an unspecified ulna and radius, meaning the bone broke due to an underlying disease rather than trauma, and the fracture has failed to heal properly (nonunion). The "K" seventh character indicates that this is a subsequent encounter for the fracture care, meaning the patient is receiving routine follow-up care during the healing phase.

Use this code for patients presenting for follow-up treatment of a pathological fracture of the ulna and/or radius that has not healed. Documentation should clearly state "nonunion" of the fracture and specify that the fracture was pathological in nature. This code is appropriate when the patient is beyond the initial active treatment phase.

• Always confirm the underlying disease causing the pathological fracture and code it first.
• Ensure documentation explicitly states "nonunion" and "pathological fracture" for the ulna and/or radius.
• Verify the encounter type; "K" is for subsequent encounters for nonunion. Do not use for initial treatment or sequela.