Unsp fx unsp forearm, subs for opn fx type 3A/B/C w nonunion

This code describes a situation where a patient has an unspecific fracture of an unspecified forearm bone (radius or ulna) that is not healing properly (nonunion). The fracture was initially an open fracture, meaning the skin was broken, and it was classified as a severe type (IIIA, IIIB, or IIIC). This code is used for follow-up care after the initial treatment of the fracture.

This code is appropriate for subsequent encounters when a patient is being managed for a previously diagnosed open forearm fracture (types IIIA, IIIB, or IIIC) that has failed to unite. This includes visits for ongoing treatment, monitoring, or planning for further intervention due to the nonunion. It would be used after the initial healing phase has passed and nonunion has been confirmed.

• Ensure documentation clearly states "nonunion" and specifies the original fracture as an open type IIIA, IIIB, or IIIC.
• Verify that this is a subsequent encounter, not the initial treatment of the fracture.
• Look for documentation indicating the specific bone (radius or ulna) if available, as more specific codes exist.