42 CFR § 405.803 - Appeals rights.
(a) A provider or supplier may appeal the initial determination to deny a provider or supplier's enrollment application, or if applicable, to revoke current billing privileges by following the procedures specified in part 498 of this chapter.
(b) The reconsideration of a determination to deny or revoke a provider or supplier's Medicare billing privileges is handled by a CMS Regional Office or a contractor hearing officer not involved in the initial determination.
(c) Providers and suppliers have the opportunity to submit evidence related to the enrollment action. Providers and suppliers must, at the time of their request, submit all evidence that they want to be considered.
(d) If supporting evidence is not submitted with the appeal request, the contractor contacts the provider or supplier to try to obtain the evidence.
(e) If the provider or supplier fails to submit the evidence before the contractor issues its decision, the provider or supplier is precluded from introducing new evidence at higher levels of the appeals process.