CPT Code 20610: Joint Injection and Aspiration Billing Guide There are a number of items to be considered when billing for the Nursing service to perform drug therapy, the charge process is Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff Billing CPT Code 96372 Accurate Injection Claim Guide Does Procedure J3420 Require Prior Authorization? CPT Code 20610: Joint Injection and Aspiration Billing Guide