Section 442.109 - Certification period for ICF/IIDs: General provisions(a) A survey agency may certify a facility that fully meets applicable requirements. The State Survey Agency must conduct a survey of each ICF/IID not later than 15 months after the last day of the previous survey.(b) The statewide average interval between surveys must be 12 months or less, computed in accordance with paragraph (c) of this section.(c) The statewide average interval is computed at the end of each Federal fiscal year by comparing the last day of the most recent survey for each participating facility to the last day of each facility's previous survey. 77 FR 29031 , May 16, 2012