The Anatomical Regions body system is identified by the character “W” in the 2nd character position and grouped within the New Technology section of the ICD-10-PCS coding structure. The 2nd character of an ICD-10-PCS code defines the particular body system or general physiological system or anatomical region involved.
X = New Technology
The 3rd character refers to the root operation or the objective of the procedure.
Putting in or on a therapeutic, diagnostic, nutritional, physiological, or prophylactic substance except blood or blood products