Disp fx of base of unsp metacarpal bone, init for clos fx

This code signifies a break in the base of one of the metacarpal bones in the hand, where the bone fragments are no longer properly aligned. The specific metacarpal involved is not documented, and the skin over the fracture remains intact. This diagnosis is for the initial treatment of the injury.

Apply this code when documentation confirms a displaced fracture at the base of an unspecified metacarpal bone, such as from a direct impact or fall. It is appropriate for the first encounter where the patient receives active treatment for this closed fracture.

• Ensure the documentation explicitly states "displaced" and "base" of the metacarpal.
• Only use this code when the specific metacarpal (e.g., first, second) is not identified in the medical record.
• The "A" suffix indicates an initial encounter for active treatment; choose subsequent or sequela codes for later visits.