Wiki Correct DRG assignment

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For all you Inpatient Coding Auditors!

A patient is scheduled for a hip replacement sx. About 3 days prior to surgery develops abdominal pain. Pt is admitted to hospital for treatment of abdominal pain which resolves, then stays for the scheduled right hip arthroplasty.
When the hospital bills for the inpatient stay, the principal Dx code submitted is 789.07, secondary codes include 715.95, and ICD-9 procedure code 81.51. This Dx moves the DRG to 468 instead of 209, which of course pays more.

What is the correct principal Dx code?

Thanks.
 
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