Note Hematomas are coded according to origin and the nature and site of the hematoma or the accompanying injury. Hematomas of unspecified origin are coded as injuries of the sites involved, except:(a) hematomas of genital organs which are coded as diseases of the organ  involved unless they complicate pregnancy or delivery(b) hematomas of the eye which are coded as diseases of the eye.For late effect of hematoma classifiable to 920-924 see Late, effect, contusion.

Note Use the following fifth-digit subclassification with categories 851-854: 0 unspecified state of consciousness 1 with no loss of consciousness 2 with brief [less than one hour] loss of consciousness 3 with moderate [1-24 hours] loss of consciousness 4 with prolonged [more than 24 hours] loss of consciousness and  return to pre-existing conscious level 5 with prolonged [more than 24 hours] loss of consciousness,  without return to pre-existing conscious levelUse fifth-digit 5 to designate when a patient is unconscious and dies before regaining consciousness, regardless of the duration of the loss of consciousness 6 with loss of consciousness of unspecified duration 9 with concussion, unspecified