Disp fx of neck of unsp metacarpal bone, init for opn fx

This code signifies a break in the neck of an unknown metacarpal bone in the hand, where the bone fragments are no longer in their normal alignment. It specifically indicates an open fracture, meaning there is a wound that communicates with the fracture site, and this is the initial treatment encounter for the injury.

Apply this code when documentation confirms an open, displaced fracture of the neck of a metacarpal bone, and the specific metacarpal (e.g., second, fifth) is not identified. This is appropriate for the initial surgical or non-surgical management of such an injury.

• Ensure documentation clearly states "open fracture" and "displaced" for accurate code assignment.
• If the specific metacarpal bone is identified (e.g., "neck of 5th metacarpal"), a more specific code should be chosen.
• The "B" seventh character indicates the initial encounter for an open fracture; subsequent encounters will require different seventh characters.