The Approach External is identified by letter "X" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 2W31X
Immobilization of Face using Splint
Immobilization of Face using Other Device
Immobilization of Face using Wire
Immobilization of Face using Cast
Immobilization of Face using Brace