(a) During the first 30 calendar days after admission, the total payment rate for a case mix classification must be increased by 20 percent. Beginning with the 31st calendar day after admission, the total payment rate is the rate otherwise determined under this chapter.

(b) The enhanced rates under this section shall not be allowed if a resident has resided during the previous 30 calendar days in:

(1) the same nursing facility;

(2) a nursing facility owned or operated by a related party; or

(3) a nursing facility or part of a facility that closed or was in the process of closing.