B-12 Injection Conundrum

Have a question about billing for B12 injections....

I know that for Medicare patients if the coding is correct then Medicare will pay (albeit, pennies on the dollar). I am getting denials from all other insurance companies. If the patient is only coming in for an injection-regardless of the underlying coding, can the patient be held responsible for the injection? In other words, do I have to bill the patients insurance? Or can I inform the patient that we don't bill B-12 injections to private insurances and they are responsible for 100% of the injection?

Any help would be greatly appreciated!

B-12 Injection Conundrum