A demand bill is a demand that a provider continue to bill Medicare for the given services even though the provider does not think that Medicare will cover them. You may demand bill after you receive an Advance Beneficiary Notice (ABN), a Home Health Advance Beneficiary Notice (HHABN), or Skilled Nursing Facility Advance Beneficiary Notice (SNFABN) from a health care provider. In order to demand bill, you must sign the ABN and agree to pay for the services in full if Medicare denies coverage.