CPT 4 Code List for Medical Procedures PDF Catheter Ct Scan The HCPCS modifier EJ is used for billing the subsequent doses in a defined course of therapy. It is not used for the first dose or injection of a series. Common applications Codeage Liposomal Glutathione, For Men and Women, 500 mg of Setria L Glutathione, 350 mg Phospholipid, non GMO, 60 Capsules The glutathione cycle: Glutathione metabolism beyond the glutamyl cycle Bachhawat 2018 IUBMB Life Wiley Online Library