A Feb. 27 transmittal (CR 6314, Transmittal No. 451) from CMS instructs the NSC to "insert the NPI into all correspondence, including pre-printed re-enrollment packages." The NSC will also validate all NPIs received from suppliers starting in July, says the transmittal. To read the CMS transmittal online, visit www.cms.hhs.gov/transmittals/downloads/R451OTN.pdf.