IV Medication/Fluids Post OP

Section P of the RAI reads "Do not code services that were provided solely in conjuction with a surgical or diagnostic procedure and the immedicate post-operative or post-procedure recovery period". So ... how long is the post-procedure period? Can pain meds and fluids for the day after surgury be coded? How about all the rest: intake/output, ostomy care, oxygen, suctioning, transfusions, ventilator? If these are NOT coded for the entire hospital stay, I would rarely code these services at all. Hmmm ...