Usage and Grammar

Q. Can you please help settle a disagreement? In the following sentence, should “instead of” be replaced with “rather than”? Overpayments occurred because facility purchased care staff processed payments using the local VA Fee schedule instead of the technical component of RBRVS.

A. Let me get this straight: in that nearly unreadable sentence (“because facility purchased care staff processed payments”?), the disagreement centers on whether to use “instead of” or “rather than”?  (Oh, wait—I see from your e-mail address that this is a government office.) Replace the phrase if you are certain that (1) there is a significant difference in meaning, and (2) the current wording does not express the meaning intended. If you cannot reach agreement on these points, you might have to fund a study.