Nondisp fx of trapezium, unsp wrist, subs for fx w nonunion

This code signifies a nondisplaced fracture of the trapezium bone in an unspecified wrist that has failed to heal properly. The patient is currently undergoing treatment for this nonunion, indicating a subsequent encounter for the fracture.

Apply this code when a patient presents for follow-up care, such as cast changes, physical therapy, or surgical planning, for a previously diagnosed nondisplaced trapezium fracture that has not united. This code is appropriate when documentation clearly indicates the fracture is in a state of nonunion and the encounter is not for the initial injury.

• Ensure documentation explicitly states "nondisplaced" and "nonunion" for the trapezium fracture.
• Verify the encounter is subsequent to the initial injury and related to ongoing treatment for the nonunion.
• Do not use this code for initial fracture treatment or for malunion, which is a different complication.