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 0HNWX
Release Right Nipple, Open Approach
Release Right Nipple, External Approach
Release Right Nipple, Via Natural or Artificial Opening
Release Right Nipple, Percutaneous Approach
Release Right Nipple, Endo