S52.252N Displaced comminuted fracture of shaft of ulna, left arm, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

S52.252N is a billable/specific and POA-exempt diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Displaced comminuted fracture of shaft of ulna, left arm, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion.