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

This code describes a fracture of an unknown bone in the lower leg, where the fracture is an open type I or II, and the bone has failed to heal after a previous treatment attempt. The "unspecified" nature means the specific bone (tibia or fibula) is not documented, and the "subsequent encounter" indicates ongoing care for the nonunion.

Use this code when a patient presents for follow-up care of an open lower leg fracture (type I or II) that has not healed, and the medical record does not specify whether it's a tibial or fibular fracture. This applies to situations where the nonunion is being managed, such as for further surgical intervention or conservative treatment.

• Ensure the documentation clearly states "nonunion" and "subsequent encounter" for an open fracture.
• If the specific bone (tibia or fibula) is identified, a more specific code should be used.
• Confirm the open fracture type is I or II; other open fracture types have different coding options.