Oth disp fx of base of 1st MC bone, r hand, init for opn fx

This code signifies a fracture at the base of the first metacarpal (thumb) bone in the right hand, where the bone fragments are no longer in their normal anatomical alignment. It specifically indicates that the skin and soft tissue overlying the fracture site have been broken, exposing the bone to the external environment.

This code is appropriate for initial encounters when documenting an open, displaced fracture of the right thumb's metacarpal base. This includes cases resulting from trauma such as falls, direct blows, or crush injuries where the bone has pierced the skin or the skin has been lacerated down to the bone.

• Ensure documentation clearly specifies "displaced" and "open fracture" for the right first metacarpal base.
• The "B" in the 7th character indicates an initial encounter for an open fracture; use subsequent characters for follow-up care.
• Always code associated open wound/laceration if not already inherent in the fracture code description.