I am new to anesthesia billing and have a question regarding calculation of time units. I am trying to figure out when to 'round up' units when the time exceeds 15 minutes. For instance, how many time units would 26 minutes be? I have read that in order to 'round up' to the next unit, the time must have exceeded at least half (7.5 minutes) of the next 15 minute time increment. So 26 minutes divided by 15 is 1.7, would I round this up to 2 units or 1? Can anyone please clarify?