denial for portable gaseous oxygen

CatchTheWind

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We are dermatology, but one of our providers' father is getting home oxygen (which I assume is E0431 - portable gaseous oxygen system). It was denied by Medicare. Unfortunately, I don't know what diagnosis code the DME company used, but does anyone know of any issues that could cause denial for this code?

Thanks!
 
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The would be more to it than just a DX. Things like detailed written orders (DWO), written order prior to delivery (WOPD), and more likely than not, a CMN was needed. All of these documents would have involved the ordering provider, the DME company, and the patient.
 
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