Carriers can no longer reject claims for not checking Box 20

Article Overview

This article reviews a CMS transmittal that changes how Medicare carriers process certain claims when the outside lab indicator is not completed on the CMS-1500 form or its electronic equivalent. It is intended for billing staff, coders, and compliance-minded providers who submit diagnostic service claims and need to understand the claim-handling implications of reporting outside laboratory involvement and purchased technical components. The discussion focuses on Medicare claims processing guidance, provider responsibility, and the potential for incorrect payment or overpayment when diagnostic services are billed.