We billed 22595 along with 61783 and we are getting a denial from insurance stating can't be billed together. Everywhere we have looked (supercoder, CPT book) does not tell us we can't bill these together. The doctor performed posterior c-1 to c-2 lateral mass fusion w/ pedicle screw instrumentation stereotatic navigation and he did an allograft and infused bone morphogenic protein. If I can't use these two codes together can anyone give me a suggestion as to what I can use with the add on code 61783? Help please!!!!