CGS Administrators, the Jurisdiction C Durable Medical Equipment Medicare Administrative Contractor (DME MAC), announced that beginning September 1, paper claims that are billed with incorrect modifiers will be returned as “unprocessable.” Prior to this, such claims have been manually corrected and processed. CGS said that the change is being made in order to be consistent with electronic claims, which are rejected by the Common Electronic Data Interchange (CEDI) if they have incorrect modifiers. CGS provided this example of a claim that will be rejected: Should code L-1840 (knee orthosis, derotation, medial-lateral, anterior cruciate ligament, custom-fabricated) be billed with an NU modifier, the claim will be rejected and returned because NU is not a needed modifier for L-1840.