Solved: View Rationale An established Medicare patient sees his primary care practitioner for medi [Others] Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical Vitamin B 12 Cyanocobalamin Injection 1000 mcg mL Med Plus Physician Supplies CPT Code 20550 Used for Injections into a Tendon sheath, Ligament, or Aponeurosis Orthopedic Billing Expert CPT Code 91320: COVID 19 Vaccine, Tris Sucrose Formulation, for Intramuscular Use