42 C.F.R. § 405.940 : Public Health — CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES — MEDICARE PROGRAM — FEDERAL HEALTH INSURANCE FOR THE AGED AND DISABLED — DETERMINATIONS, REDETERMINATIONS, RECONSIDERATIONS, AND APPEALS UNDER ORIGINAL MEDICARE (PART A AND PART B) —REDETERMINATIONS — Right to a redetermination

A person or entity that may be a party to a redetermination in accordance with §405.906(b) and that is dissatisfied with an initial determination may request a redetermination by a contractor in accordance with §405.940 through §405.958, regardless of the amount in controversy.

42 C.F.R. §405.940