Stress fx, unsp ulna and radius, subs for fx w nonunion

This code signifies a stress fracture affecting an unspecified bone of the forearm (ulna or radius) that has failed to heal properly after initial treatment. It indicates that the patient is presenting for ongoing management of this nonunion.

Apply this code when documentation clearly states a stress fracture of the ulna or radius with established nonunion, and the patient is seen for follow-up care, further treatment, or evaluation of this unhealed fracture. Supporting documentation should include imaging reports confirming nonunion and a physician's assessment of the fracture's healing status.

• Ensure "stress fracture" and "nonunion" are explicitly documented. Do not use for acute or pathological fractures.
• The "K" seventh character indicates a subsequent encounter for a fracture with nonunion, meaning the initial treatment has failed.
• If the specific bone (ulna or radius) is identified, a more specific code from the M84.33- series should be used.