Medicare Program Integrity Manual (Pub. 100-08), Ch. 9 § 9.5.2
Underpayments
9.5.2 – Underpayments
(Rev. 921, Issued: 11-06-19 Effective: 11-04- 19, Implementation: 11-04-19)
The MAC shall process all underpayments using the mass adjustment process whenever
possible. The MAC shall upload a transaction file into the RACDW that includes the
required information on the underpayment reimbursement to the provider.