Minn. Stat. § 144.563

A hospital that has been granted a license condition under section 144.562 or 144.5621 must not provide to patients not reimbursed by Medicare or medical assistance the types of services that would be usually and customarily provided and reimbursed under medical assistance or Medicare as services of a skilled nursing facility or intermediate care facility for more than 42 days and only for patients who have been hospitalized and no longer require an acute level of care. Permission to extend a patient's length of stay may be granted by the commissioner if requested by the physician at least ten days prior to the end of the maximum length of stay.