Oth fx lower end l ulna, subs for opn fx type I/2 w nonunion

This code signifies a nonunion of an open fracture of the distal left ulna, specifically an original Gustilo type I or II injury. Nonunion indicates that the bone has failed to heal completely after the initial fracture, requiring ongoing medical management.

Apply this code for a patient presenting with a previously diagnosed open fracture of the lower end of their left ulna (Gustilo type I or II) that has not healed and is now considered a nonunion. This would be used during subsequent encounters for the management of this specific complication.

• Ensure documentation clearly specifies "nonunion" and the original open fracture type (I or II).
• Verify laterality (left ulna) is accurately documented.
• Confirm this is a subsequent encounter for the nonunion, not the initial injury.