Access and Billing Codes HIZENTRA Immune Globulin Subcutaneous (Human) 20% Liquid Successfully Coding Retina Injectable Drugs Retina Today Practice Management for Photobiomodulation of the Retina Retinal Physician In medical coding, HCPCS Modifier JB is an informational modifier indicating a drug was administered subcutaneously (under the skin) when the HCPCS code allows for multiple administration routes, like intravenous (IV) or