Nondisp fx of prox phalanx of thmb, subs for fx w nonunion

This code signifies a fracture of the upper part of the thumb's bone that is not out of alignment, and the patient is presenting for follow-up care because the fracture is not healing properly. This indicates a complication where the bone fragments have failed to unite after a previous fracture.

Apply this code when a patient with a previously diagnosed nondisplaced proximal phalanx fracture of an unspecified thumb is seen for ongoing management due to confirmed nonunion. This would typically be used during subsequent visits after the initial treatment, when the lack of healing has been identified.

• Ensure documentation clearly states "nondisplaced" and "nonunion" for the proximal phalanx of the thumb.
• Verify that this is a subsequent encounter, not the initial treatment for the fracture.
• Laterality (left or right thumb) is unspecified with this code; use a more specific code if laterality is documented.