VITAMIN B12 INJECTION 1000 mcg mL ICD 10 D50D53 Anemias: Coding Guide for Accurate Billing Cyanocobalamin 1,000 mcg mL Injection 1 mL McKesson Vitamin B 12 Cyanocobalamin Injection 1000 mcg mL Med Plus Physician Supplies 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 Cyanocobalamin Injection, Solution NDC63323 044 01