Does Procedure J3420 Require Prior Authorization? When coding for trigger point injections, the documentation must include the site of the injection, the total number of injections and the number of muscles involved. There are two CPT codes 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, CPT Code 96372: Description, Usage, and Billing Guidelines (2025)