20 C.F.R. § 404.1519j
You or your representative may object to your being examined by a medical source we have designated to perform a consultative examination. If there is a good reason for the objection, we will schedule the examination with another medical source. A good reason may be that the medical source we designated had previously represented an interest adverse to you. For example, the medical source may have represented your employer in a workers' compensation case or may have been involved in an insurance claim or legal action adverse to you. Other things we will consider include: The presence of a language barrier, the medical source's office location (e.g., 2nd floor, no elevator), travel restrictions, and whether the medical source had examined you in connection with a previous disability determination or decision that was unfavorable to you. If your objection is that a medical source allegedly "lacks objectivity" in general, but not in relation to you personally, we will review the allegations. See § 404.1519s . To avoid a delay in processing your claim, the consultative examination in your case will be changed to another medical source while a review is being conducted. We will handle any objection to use of the substitute medical source in the same manner. However, if we had previously conducted such a review and found that the reports of the medical source in question conformed to our guidelines, we will not change your examination.
20 C.F.R. §404.1519j