I have a patient with a stage four coccxy wound, regularly see's wound care specialist once a week (also has ulcers on foot), primary doctor wrote a script for air loss mattress but home health agency is saying it is being denied....why?! Please help my patient. The reason told why matress is being denied is because the wound has to be covering 25% of pt trunk. (Wound is 1cm wide). Thanks for any advice or explanation..