In this particular case, the correct answer is 21315. When you look at the CPT index, you should search for Fracture/nasal bone/closed treatment. Once you fin this it will refer you to 21310-21320. You can look through those codes and see that 21315 is the right choice because any displaced nasal fracture that has been manipulated with forceps for the purpose of realigning the nasal bones falls in this category.
