Code as a 1/5 day or as a 05/readmission

[Janice]

I have a res. that was discharged prior to completion.  She is now back in the facility and I have been wondering should she be coded as a 1 for a 5 day or as a 05 readmission.  She has had one 5 day done prior to going back to the hospital.  I have always been under the understanding that when a res. returns and you have not done the admission assessment yet you code them as another 5 day because if you code them as a readmission/05 that continues the time line that they were on when they were originally admitted.  Please clarify for me.  Thanks