42 CFR §456.129

1. (a)The methods and criteria, including norms if used, that the committee uses to assign the initial continued stay review date under § 456.128.
2. (b)The methods that the committee uses to select categories of admission to receive close professional scrutiny under § 456.123(b); and
3. (c)The methods that the committee uses to modify an approved length of stay when the beneficiary's condition or treatment schedule changes.