The diabetic foot
is one of the commonest complications of uncontrolled diabetes
,often requiring prolonged hospitalisation.Due to several factors including ignorance and apathy,patients reach hospital in advanced stage.
Since your friend is already having fever with chills,it means he is having severe infection and if untreated it may lead to deep seated infection,osteomyelitis
You don't have to wait for anything and he has to shifted to the hospital urgently.
Do it if you want to save the foot of your friend.