Disp fx of proximal phalanx of thmb, subs for fx w nonunion

This code signifies a fracture of the upper part of the thumb's phalanx that is no longer in its correct anatomical position. It specifically indicates that the fracture has failed to heal properly and the patient is presenting for follow-up care related to this nonunion.

Apply this code when documentation confirms a displaced fracture of the proximal phalanx of the thumb, and the patient is being seen for ongoing management of a nonunion. This would typically be used after initial treatment has failed to achieve bone healing.

• Ensure documentation explicitly states "nonunion" for the subsequent encounter.
• Verify the fracture is of the proximal phalanx and is displaced.
• This code is for an unspecified thumb; if left or right is known, a more specific code should be used.