ICD-9 codes populating in our billing system


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I hope someone can give me some insight on this. My provider submits his inpatient billing to me for several days at a time, all with the same diagnoses. I enter these different dates on different lines on the same claim. In the past, I entered the first line with the diagnoses (be it one, two, three or four), the system then would populate the subsequent lines with the same diagnoses. We now have a new compliance department who has changed this feature in our billing system and I now have to enter each diagnosis on each line, even thought they are all the same. They have referred us to the ICD-9-CM Official Guidelines for Coding and Reporting to explain this change. I have read, re-read, and re-read again this guidline and I cannot find this in writing anywhere. Can somebody point me in the right direction? Thank you