Medicare Claims Processing Manual (Pub. 100-04), Ch. 12 § 90.5.6
Post-payment Review
90.5.6 - Post-payment Review
(Rev. 280, Issued 08-13-04, Effective/Implementation: October 1, 2004 for the
analysis and design phases for the MCS Maintainer and A/B MACs (B)
January 1, 2005 for the coding, testing, and implementation phases for the MCS
Maintainer and A/B MACs (B)
January 1, 2005 for all phases for the VIPS Maintainers and A/B MACs (B))
On a post-pay basis, services submitted with the AR modifier will be subject to
validation.