Oth disp fx of base of 1st MC bone, r hand, 7thP

This code signifies a malunion of a previously treated fracture at the base of the first metacarpal bone (thumb) in the right hand. A malunion indicates that the bone has healed, but in an incorrect anatomical position or alignment, potentially leading to functional impairment.

This code is used for follow-up encounters where a patient presents with a right thumb base metacarpal fracture that has healed improperly. It is appropriate when the physician documents a malunion and the patient is past the initial healing phase, often presenting with ongoing pain, deformity, or limited range of motion due to the malaligned bone.

• Ensure documentation clearly states "malunion" and specifies the right hand and first metacarpal base.
• Verify this is a subsequent encounter, not an initial treatment for the fracture.
• Differentiate from nonunion, which implies a failure to heal, rather than healing in an incorrect position.