Which of the following applies with regard to co-morbidity adjustments in the Medicare prospective ...

Which of the following applies with regard to co-morbidity adjustments in the Medicare prospective payment system for dialysis facilities?
 A) There are only a few (less than 20 ) categories of conditions that qualify as co-morbidities.
  B) There are a significant number (over 100 ) of categories of conditions that qualify as co-morbidities.
  C) There are numerous (more than 1,000 ) categories of conditions that qualify a co-morbidities.
  D) There are no co-morbidity adjustments in the Medicare prospective payment system for dialysis facilities.