Billing CPT Code 96372 Accurate Injection Claim Guide Vitamin B12 is essential for energy production, nervous system function, and red blood cell formation. However, oral B12 supplementation doesn't work well for everyoneabsorption can be limited by digestive issues, certain medications, When to use CPT code for B12 injection Medical Coding Guide Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical CYANOCOBALAMIN J Code: J3420 Cost and Price