Hi,
I'm not sure what state you're in but in NY state our BCBS allows a global fee for chiropractors. So they don't allow any additional codes, modalities, etc. Just the global $30 fee for the manipulation. Many other insurance carriers do the same thing. I would call BCBS and ask them if that is what is happening on your claims, or look at the eob for an explanation. Ours indicate that any additional codes are included in the main code for the manipulation.
Thanks
Michele