US lawFederal (United States)Agency guidanceCMS Medicare Internet-Only ManualsPub. 100-04Chapter 1290.4.6Medicare Claims Processing Manual (Pub. 100-04), Ch. 12 § 90.4.6Reserved for Future UseLength: 6 wordsOfficial source 90.4.6 - Reserved for Future UsePreviousMedicare Claims Processing Manual (Pub. 100-04), Ch. 12 § 90.4.5NextMedicare Claims Processing Manual (Pub. 100-04), Ch. 12 § 90.4.7