[Code of Federal Regulations] [Title 42, Volume 3] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 42CFR476.84] [Page 456] TITLE 42--PUBLIC HEALTH CHAPTER IV--CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 476_UTILIZATION AND QUALITY CONTROL REVIEW--Table of Contents Subpart C_Review Responsibilities of Utilization and Quality Control Quality Improvement Organizations (QIOs) Sec. 476.84 Changes as a result of DRG validation. A provider or practitioner may obtain a review by a QIO under part 473 of this chapter for changes in diagnostic and procedural coding that resulted in a change in DRG assignment as a result of QIO validation activities.