The RAI Manual is very clear (pages 2-45 and 2-46).
• Is the first Medicare-required assessment to be completed when the resident is first admitted for SNF Part A stay.
• Is the first Medicare-required assessment to be completed when the Part A resident is re-admitted to the facility following a discharge assessment – return not anticipated or if the resident returns more than 30 days after a discharge assessment-return anticipated.
• Completed when a resident whose SNF stay was being reimbursed by Medicare Part A is hospitalized, discharged return anticipated, and then returns to the SNF from the hospital within 30 days and continues to require and receive Part A SNF-level care services. Under these conditions, the entry tracking record completed upon return to the SNF will be coded as a reentry with Item A1700 = 2.