Coding MDS

I had a patient come in under medicare for two days and left, I can do the 5 day with the second day as the ARD but what about the OBRA ? Do I code it 5 day for medicare then do a d/c prior to initial assessment for OBRA or would they think as I had done a 5 day that could be used as an initial assessment. ?? I have been doing MDS for 2 1/2 years and believe it or not this is the first medicare to leave prior to 5 day for me. I thought I had done it all !!!!!