S59.012P
ICD-10-CMSalter-Harris Type I physeal fracture of lower end of ulna, left arm, subsequent encounter for fracture with malunion
This code describes a growth plate fracture at the lower end of the left ulna, specifically a Salter-Harris Type I, which involves a separation of the epiphysis from the metaphysis without bone involvement. The "subsequent encounter" indicates ongoing treatment for the fracture, and "with malunion" specifies that the bone has healed in an anatomically incorrect position.
This code is appropriate when a patient is receiving follow-up care for a previously diagnosed Salter-Harris Type I fracture of the distal left ulnar physis, and imaging or clinical assessment confirms that the fracture has healed with an unacceptable alignment. This could include scenarios where corrective procedures are being planned or managed due to the malunion.
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