Quick question to help settle an office dispute...we have an observation patient that received his IV and injection on the first day, and the second day received another drug injection. Some are arguing that this should be coded with a 96374 for the drug on the first day, and 96375 for the drug on the second day. Others are arguing that 96374 must be billed per date of service, meaning the second day would also be 96374, and the system is rejecting it the first way and saying it should be the second way, too. Keeping in mind this was a 48 hour observation stay, is it appropriate to bill by day, or consider the whole stay as one visit and bill the 96375 the next day? Opinions?