42 CFR § 489.40
Definition of incorrect collection
June 11, 2020
(a) As used in this subpart, “incorrect collections” means any amounts collected from a beneficiary (or someone on his or her behalf) that are not authorized under subpart C of this part.
(b) A payment properly made to a provider by an individual not considered entitled to Medicare benefits will be deemed to be an “incorrect collection” when the individual is found to be retroactively entitled to benefits.