States that Except in cases where the covered person’s treating physician has certified in writing that the covered person has a serious medical condition, or where the denial of coverage is based on a determination that the health care service or treatment recommended or requested is experimental or investigational and the covered person’s treating physician has provided the certifications required pursuant to Section 38-71-1980, a request for a standard or expedited external review may not be made until the covered person has exhausted the health carrier’s internal appeal process.