Colles' fx unsp rad, subs for opn fx type 3A/B/C w nonunion

This code signifies a Colles' fracture of an unspecified radius that has failed to heal (nonunion) following an initial open reduction and internal fixation (ORIF) or other surgical intervention. It specifically indicates a subsequent encounter for the ongoing management of this nonunion in an open fracture classified as Type IIIA, IIIB, or IIIC.

Use this code for patients presenting with a previously treated open Colles' fracture where the bone fragments have not united, and they are receiving follow-up care for this complication. This applies to encounters where the nonunion is being actively managed, such as for further imaging, medication adjustments, or planning for revision surgery.

• Ensure documentation clearly specifies "nonunion" and the "subsequent encounter" for the fracture.
• Verify the original fracture was an "open" Colles' fracture and its Gustilo-Anderson classification (IIIA, IIIB, or IIIC).
• Do not use for initial fracture treatment or for malunion, which is a different complication.