Nondisp fx of prox phalanx of l thm, subs for fx w nonunion

This code describes a fracture in the bone closest to the hand in the left thumb that is not properly healing. The bone fragments remain in their normal anatomical alignment, but the healing process has stalled, leading to a nonunion. This indicates a complication in the fracture recovery.

Use this code for follow-up encounters where a patient is being treated for a nonunion of a previously diagnosed nondisplaced proximal phalanx fracture of the left thumb. This applies when the physician is assessing, monitoring, or actively managing the nonunion, such as considering surgical intervention or continued conservative management.

• Ensure documentation clearly states "nonunion" and specifies the left thumb's proximal phalanx.
• Verify the fracture was initially nondisplaced.
• This code is for subsequent encounters, not the initial injury.