Frequency reimbursement policy for qualitative drug screening

The Frequency Policy was updated to document that procedure codes G0431 and G0434 for qualitative drug screening are eligible for one (1) unit of reimbursement per date of service. Effective with claims processed on or after November 11, 2012, Modifier 91 (repeat clinical diagnostic laboratory test) will no longer override the quantity limit. This change is consistent with CMS medically unlikely edits.