Nondisp Rolando's fracture, l hand, subs for fx w nonunion

This code describes a follow-up visit for a patient with a Rolando's fracture of the left thumb metacarpal base, specifically when the fracture fragments are still in their anatomical position (nondisplaced). The key clinical feature for this code is that the fracture is not healing as expected, indicating a nonunion.

Use this code for subsequent encounters when a patient with a previously diagnosed nondisplaced Rolando's fracture of the left hand is being treated for a nonunion. This typically involves ongoing management, monitoring of healing, or preparation for further intervention due to the lack of bone fusion.

• Requires an associated external cause code (e.g., V00-Y99) if the cause of the fracture is known and documented.
• Do not use for initial treatment or routine follow-up of a healing fracture; reserve for documented nonunion.
• Ensure laterality (left hand) and displacement (nondisplaced) are clearly supported by clinical documentation.