Modifier Q0

Investigational clinical service provided in a clinical research study that is in an approved clinical research study

This modifier identifies when a beneficiary is enrolled in an approved clinical study.

Correct Use

  • Use for home oxygen for treatment of cluster headaches (CH)
  • Use for transcutaneous electrical nerve stimulators (TENS) for treatment of chronic low back pain (CLBP)

In addition to modifier Q0, include clinical trial number on claim as well.

  • Paper claims: Indicate clinical trial number in Item 19 preceded by the letters "CT"
  • EMC: Indicate clinical trial number in Loop 2300 REF02(REF01=P4)



Last Updated Oct 05 , 2022