Oth nondisp fx of base of 1st MC bone, l hand, 7thK

This code signifies a fracture at the base of the first metacarpal bone (thumb) in the left hand that is not displaced. The "subsequent encounter" indicates the patient is receiving follow-up care for this fracture, and "nonunion" specifies that the bone fragments have failed to heal together after the expected healing period.

Apply this code when documenting ongoing treatment for a left thumb metacarpal base fracture that has not healed properly. This includes scenarios where a patient is undergoing further evaluation, conservative management, or surgical intervention specifically for the nonunion of the fracture. It is used after the initial treatment phase.

• Ensure documentation clearly states "left hand" and "base of first metacarpal" to support this specific site.
• Verify that the physician's notes explicitly mention "nonunion" and that the encounter is not for initial treatment.
• Pair this diagnosis code with appropriate procedure codes for any interventions performed to address the nonunion.