Oth fx lower end of left ulna, subs for clos fx w nonunion

This code signifies a fracture of the lower portion of the left ulna, excluding specific types like Salter-Harris or physeal fractures. The fracture has not healed properly (nonunion), and the patient is presenting for follow-up care after initial treatment, with the skin remaining intact over the fracture site.

Use this code for a patient who previously sustained a closed, unspecified fracture of the distal left ulna and is now being seen for management of a confirmed nonunion. This applies to subsequent visits where the nonunion is the primary focus of care, such as for evaluation of healing progress, pain management, or planning for further intervention.

• Ensure documentation clearly states "nonunion" and specifies the "left ulna" and "lower end."
• Verify the encounter is "subsequent" and the fracture was initially "closed."
• Distinguish from malunion (S52.692P) or routine follow-up for a healing fracture (S52.692D/G).