Unsp fx fourth MC bone, right hand, subs for fx w nonunion

This code signifies an unspecific break in the fourth metacarpal bone of the right hand that has failed to heal properly. It indicates that the patient is receiving ongoing care for this non-healing fracture, rather than initial treatment. The exact nature of the fracture (e.g., transverse, oblique) is not specified.

Use this code for follow-up encounters when a patient presents with a previously diagnosed fourth metacarpal fracture of the right hand that has not united. This includes situations where surgical intervention for nonunion is being planned or has already occurred, or when conservative management for nonunion is ongoing. It is appropriate for documenting continued care and monitoring of the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the right fourth metacarpal.
• This code requires an additional code for any associated complications or external causes, if applicable.
• Do not use for initial fracture treatment or for malunion, which is a different complication.