Disp fx of shaft of 1st MC bone, unsp hand, 7thK

This code signifies a fracture of the shaft of the first metacarpal bone (thumb) that has become displaced, meaning the bone fragments are no longer properly aligned. The "subsequent encounter" indicates the patient is receiving ongoing care for this fracture, and "nonunion" specifies that the bone is failing to heal properly after a typical healing period.

This code is appropriate for follow-up visits where a patient is being treated for a displaced first metacarpal shaft fracture that has not united. This includes scenarios such as continued conservative management, evaluation for surgical intervention due to nonunion, or post-operative care for a nonunion repair.

• Ensure documentation clearly states "nonunion" and specifies the "shaft" of the first metacarpal.
• Verify the encounter is "subsequent" and not an initial treatment for the fracture.
• Laterality (left or right hand) is unspecified in this particular code; if known, a more specific code should be used.