You reference the 7th Character N, which is for Nonunion of an Open Fracture of Gustilo Types IIIA, B, or C (significant trauma and injury). Was the original fracture open or closed? If it was open, then the "relative" risk of a developing a Delayed Union or Nonunion is much higher, particularly at 2 months post injury. If it were a closed fracture originally, and either non-displaced/undisplaced or very minimally or mildly displaced, then there would be a "reasonable" or "possible" chance that it was "healed" by the time of the second injury, depending on a lot of factors related to the patient and their healing capabilities. But, as usual, it all goes back to the Documentation.
Respectfully, Alan Pechacek, M.D.