You cannot always bill part B. It depends on the diagnosis. You're going to get chargebacks for improper diagnosis and documentations (yes the doctor will have to fill out an order form as well). Like many posters here have said, chronic dx (asthma, COPD) should be going through part B whereas acute dx (bronchitis, pneumonia, SOB) should be going through part D. I know part D will auto reject and I have seen many rphs at my company just randomly push it through part B just to get the claim to go through and then we get a bunch of chargebacks months later. At Walgreens, when you try to bill part B, the system prompts you to verify all of these and then put in an override. Of course, people don't care and they just override it anyway just to get the customer and claim out of the way and then we take a hit on these months later. Albuterol is cheaper but when you're doing this on Brovanna and other brand meds...you're looking at thousands of dollars in chargebacks. Please don't do this.