In its first year of implementation, the Medicare G2211 longitudinal care code was billed 24 million times by over 200 000 clinicians, totaling $394 million in payments. Although primary care physicians billed UASI Coding Tip: Z Codes ICD 10 CM CC Coding and Clinical Impact Successfully Coding Retina Injectable Drugs Retina Today 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 CPT Code 93458: Billing Guidelines, Modifiers & Medicare Pay