Fx unsp phalanx of left thumb, subs for fx w nonunion

This code signifies a fracture of an unspecified phalanx in the left thumb that has failed to heal properly, as documented during a follow-up visit. Nonunion indicates that the bone ends have not united and healing has ceased, requiring further intervention or management.

Use this code for a patient presenting for ongoing treatment or evaluation of a previously diagnosed left thumb phalanx fracture where nonunion has been confirmed. This applies to encounters for surgical intervention, cast changes, physical therapy, or imaging studies specifically addressing the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the left thumb phalanx.
• This code is for subsequent encounters; an initial encounter would use the appropriate initial encounter code.
• Always sequence this code after the primary reason for the encounter, if applicable.