Section 417.423 - Special rules: ESRD and hospice patients(a)ESRD patients.(1) A Medicare beneficiary who has been medically determined to have end-stage renal disease is not eligible to enroll in an HMO or CMP.(2) However, if a beneficiary is already enrolled in an HMO or CMP when he or she is determined to have end-stage renal disease, the HMO or CMP-(i) Must reenroll the beneficiary as required by § 417.434 ; and(ii) May not disenroll the beneficiary except as provided in § 417.460 .(b)Hospice patients. A Medicare beneficiary who elects hospice care under § 418.24 of this chapter is not eligible to enroll in an HMO or CMP as long as the hospice election remains in effect.60 FR 45677, Sept. 1, 1995