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I think I have a provider being thrown off by "per day" in the description of 99221. To verify that my knowledge of the code is accurate - can this code be billed on multiple dates of service? I have always read it as 99221-99223 should be billed once per admission and 99231-99233 would be billed by that physician on subsequent dates. For example, the physician is using 99221 for each date from 3/5-3/10.