Avoiding Claim Denials For AMCC Tests When billing with medical modifier codes for automated multi-channel chemistry it is important to bill correctly to prevent denial. When a patient has end-stage renal disease it is important to use the 50/50 medical billing rule. This rule requires automatic multi-channel chemistry tests to be correctly identified on claims. Recently, the Centers for Medicare & Medicaid services has decided to deny laboratory claims that do not comply with this rule. The correct medical billing modifier for an automatic multi-channel chemistry test is required in order to prevent this denial from occurring. This is required when ever a medical end-stage renal disease facility or a …