Modifier XS


Separate Structure, A Service That Is Distinct Because It Was Performed on A Separate Organ/Structure

Appropriate Usage

  • Append when coding pairs are part of National Correct Coding Initiative (NCCI) procedure to procedure edits
  • Append when documentation indicates services were provided on different organs/structures
  • Append to Column 2 procedure code in NCCI files
  • Append only when there is no other modifier to describe situation

Inappropriate Usage

  • Appending when code pairs are not part of the NCCI procedure to procedure edits
  • Appending if another valid modifier exists to identify separate services
  • Submission of E/M Codes
  • Submission of Weekly radiation therapy management codes (CPT 77427)
  • NCCI code files show modifier application as "0"
  • Appending when documentation does not support the services were provided on a separate organ/structure
    • Example: both procedures were performed on liver during a single encounter
  • Exact same procedure code performed twice on same day
  • Multiple administration of injections of same drug
  • Submitted with Modifier 59

Additional Information


Last Updated Jan 17 , 2023