The 3rd character refers to the root operation or the objective of the procedure.

Anatomical Regions

  • XWH - Insertion

    Putting in a nonbiological appliance that monitors, assists, performs, or prevents a physiological function but does not physically take the place of a body part

  • XW0 - Introduction

    Putting in or on a therapeutic, diagnostic, nutritional, physiological, or prophylactic substance except blood or blood products

  • XW1 - Transfusion

    Putting in blood or blood products