Vitamin Deficiency Injectable System B12 Should CPT code 96372 be billed with an E M code? CPT 96372: Injection Billing Made Simple for Medical Practices 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 ICD 10 D50D53 Anemias: Coding Guide for Accurate Billing Compounded Cyanocobalamin (Vitamin B12) Injection Empower