How to Calculate 30-Day Readmission Rate

This  rate  is  calculated  by  identifying individual  residents admitted to the facility after an inpatient hospital stay during a given a given period of time, usually calculated on a monthly basis, and following them for 30 days.
a. The denominator for  this  calculation is the  number  of residents admitted to  your facility who have had an inpatient hospital stay during the month.
The numerator is the number of inpatient hospitalizations among   these   residents that   occur within   30-days   of admission to your facility after an inpatient hospital stay.
b. Residents sometimes have two (or even more) 30-day readmissions in a 30 day period.
Each  admission  to  your  facility  after  an  inpatient  stay  should  be  counted  in  the denominator, and inpatient hospitalizations within 30-days of the most recent admission to your facility after an inpatient hospital stay should be counted in the numerator. Thus, one resident could contribute two or more times to the 30-day readmission rate.