for instance:
http://www.medicare.gov/publications/pubs/pdf/hosplg.pdf
Treatment to cure your terminal illness. As a hospice patient, you can get comfort care to help you cope with your illness, not cure it.
Comfort care includes drugs for symptom control and pain relief, physical care, counseling, and other hospice services (see page 5).
Hospice uses medicine, equipment, and supplies to make you as comfortable and pain-free as possible. Medicare will not pay for treatment to cure your illness. You should talk with your doctor if you are thinking about potential treatment to cure your illness.
As a hospice patient, you always have the right to stop getting hospice care and go back to your regular doctor or health plan
One more--who has been certifying Terri as Terminally ill?
(Private insurance companies are pretty much in line with Medicare, so here is a good guide)
http://www.medicare.gov/publications/pubs/pdf/hosplg.pdf
You can get hospice care as long as your doctor certifies that you are terminally ill and probably have less than six months to live.
Even if you live longer than six months, you can get hospice care as long as your doctor recertifies that you are terminally ill. Hospice care is given in periods of care. As a hospice patient, you can get hospice care for two 90-day periods followed by an unlimited number of 60-day periods.
At the start of each period of care, your doctor must certify that you are terminally ill in order for you to continue getting hospice care. A period of care starts the day you begin to get hospice care. It ends when your 90 or 60-day period is up.
If your doctor recertifies that you are terminally ill, your care continues through another period of care.
Note: Periods of care are important. They are a time when your doctor recertifies that you still need and remain eligible for hospice care.