Stress fracture, unspecified ankle, init encntr for fracture

This code signifies a stress fracture affecting an unspecified ankle, meaning the specific bone (e.g., tibia, fibula, talus) involved is not documented. Stress fractures are overuse injuries resulting from repetitive microtrauma to bone, often seen in athletes or individuals with sudden increases in activity. This particular code indicates the patient is receiving initial active treatment for this fracture.

Apply this code when documentation confirms a stress fracture of the ankle, but the specific bone within the ankle is not identified. This is appropriate for the initial visit where the fracture is diagnosed and treatment begins, such as casting, bracing, or activity modification. Supporting documentation should include a diagnosis of stress fracture, ankle involvement, and the "initial encounter" status.

• Ensure documentation explicitly states "stress fracture" and not a traumatic fracture, which would be coded differently.
• If the specific ankle bone is identified (e.g., tibial stress fracture), a more specific code from the M84.37- subcategory should be used.
• This code requires a 7th character "A" for initial encounter; subsequent encounters for routine healing or follow-up would use "D" or "G," respectively.