96372 CPT Code: Injection of drug substance under skin or into muscle Injection and Infusion Coding: What You NEED to Know! Not all injections are created equal and in the CPT Medicine section, the difference between an IV infusion, an IM injection, Does Procedure J3420 Require Prior Authorization? What is Hizentra? Hizentra is a sterilized solution made from human plasma. It contains the antibodies to help your body protect itself against infection from various diseases. Hizentra subcutaneous infusion (for injection Billing CPT Code 96372 Accurate Injection Claim Guide ICD 10 D50D53 Anemias: Coding Guide for Accurate Billing