CFR > Title 42 - Public Health > CHAPTER IV—CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER B—MEDICARE PROGRAM (parts 405 to 426) > PART 405—FEDERAL HEALTH INSURANCE FOR THE AGED AND DISABLED > SUBPART R—Provider Reimbursement Determinations and Appeals (§405.1801 to §405.1889) > 405.1881—Appointment of representative.