Unsp fx first MC bone, unsp hand, subs for fx w nonunion

This code signifies a fracture of the first metacarpal bone (thumb) that has not healed properly, and the patient is presenting for follow-up care related to this ongoing issue. The specific side of the hand and the exact nature of the fracture are not documented.

Use this code when a patient returns for treatment of a previously diagnosed, non-healing fracture of the first metacarpal. This applies to situations where the initial fracture details are unknown or not specified, and the current encounter focuses on managing the nonunion.

• Ensure documentation clearly states "nonunion" for the first metacarpal fracture.
• Verify that the encounter is for subsequent care, not the initial treatment of the fracture.
• If the specific hand (left/right) is documented, choose a more specific code from the S62.20- series.