Unsp fx unsp forearm, subs for opn fx type I/2 w nonunion

This code signifies a nonunion of an unspecified open forearm fracture (Type I or II) that occurred in the past. The specific bone (radius or ulna) and location within the forearm are not documented. This diagnosis indicates a failure of the fracture to heal properly after initial treatment.

Use this code for follow-up encounters where a patient presents with an unhealed open forearm fracture, previously classified as Type I or II, and the specific bone involved is not specified in the medical record. This applies when the physician documents nonunion of the fracture.

• Ensure documentation clearly states "nonunion" and specifies the encounter as subsequent.
• Verify the original fracture was an open fracture, Type I or II, even if the specific bone is not identified.
• Avoid this code if the specific forearm bone (radius or ulna) is documented; instead, use a more specific code for that bone.