42 CFR § 456.123 - Admission review process.
The UR plan must provide that -
(a) Admission review is conducted by -
(1) The UR committee;
(2) A subgroup of the UR committee; or
(3) A designee of the UR committee;
(c) If the committee, subgroup, or designee finds that the admission is needed, the committee assigns an initial continued stay review date in accordance with § 456.128;
(d) If the committee, subgroup, or designee finds that the admission does not meet the criteria, the committee or a subgroup that includes at least one physician reviews the case to decide the need for admission;
(e) If the committee or subgroup making the review under paragraph (d) of this section finds that the admission is not needed, it notifies the beneficiary's attending physician and gives him an opportunity to present his views before it makes a final decision on the need for the continued stay;
(f) If the attending physician does not present additional information or clarification of the need for the admission, the decision of the committee or subgroup is final; and
(g) If the attending physician presents additional information or clarification, at least two physician members of the committee review the need for the admission. If they find that the admission is not needed, their decision if final.