Multiple fx of ribs, left side, subs for fx w nonunion

This code signifies that a patient has sustained multiple rib fractures on the left side, and these fractures are failing to heal properly (nonunion). This diagnosis is made during a follow-up visit after the initial treatment for the fractures.

Apply this code when documenting ongoing care for a patient with previously diagnosed multiple left-sided rib fractures that are not uniting as expected. This would include scenarios where surgical intervention for nonunion is being planned or has been performed, or when conservative management for nonunion is continuing.

• Ensure documentation clearly specifies "multiple" ribs and "left side" to support this code.
• Verify that the encounter is for follow-up care related to the nonunion, not the initial injury.
• Always code the underlying cause of the fracture if known and applicable (e.g., trauma, pathological fracture).