Our office has received several denials from Medicare when billing multiple injections at the same time.

Example: M17.0, M75.42
20610- Rt (M17.0)
20610- Lt (M17.0)
20610- XS-Lt (M75.42)

First question, what do you think is incorrect about this?

Second question, one of our follow-up girls is adding modifier 51 to these and sending them back out the door without ever bringing back to our coders.
Example of how she is changing it: M17.0, M75.42
20610- Rt-51
20610- Lt-51
20610- XS-Lt

The other coder, in my office, and I have never used modifier 51 on injections before. Is this appropriate? We have made copies of the claims we have noticed her doing this to, and are waiting to see what Medicare does. Do you think this is going to pay?