The duration for diagnostic injection is not defined in the policy. Rather the policy requires response rate that aligns with the injectant used as follows:

“The diagnostic SIJI provided a minimum of 75% relief of primary (index) pain with the diagnostic SIJI (a positive diagnostic response is defined as 75% sustained and constant pain relief for the duration of the local anesthetic and 75% sustained and constant pain relief for the duration of the anti-inflammatory steroid) was measured by the same pain scale* at baseline.”