Disp fx of nk of 1st MC bone, l hand, subs for fx w nonunion

This code signifies a fracture of the neck of the first metacarpal bone (thumb) in the left hand that is displaced, meaning the bone fragments are not properly aligned. The "subsequent encounter for fracture with nonunion" indicates that the fracture has failed to heal after an initial treatment period.

This code is appropriate when a patient presents for ongoing management of a left thumb metacarpal neck fracture that has been previously treated but shows no signs of healing (nonunion). It would be used for follow-up visits, surgical interventions to address the nonunion, or other treatments aimed at promoting bone healing after the initial acute phase.

• Ensure documentation clearly specifies the left hand and the neck of the first metacarpal.
• Verify that the fracture is explicitly documented as displaced and that nonunion is confirmed.
• This code is for subsequent encounters; an initial encounter for the acute fracture would use a different code.