The National Institutes of Health (NIH) intends to publish a Funding Opportunity Announcement (FOA) for a Limited Competition aimed at the continuation of Clinical Sites for the Undiagnosed Diseases Network (UDN). This opportunity is specifically for institutions and Program Directors/Principal Investigators who have previously received NIH funding under the UDN program and allows them to compete for an additional year of funding to sustain their participation, enhance collaborations, and develop sustainability plans as the network transitions to a national resource. The estimated total program funding is $6.5 million, with an award ceiling of $400,000 and an expected 11 awards to be made. Interested applicants should prepare for the anticipated application due date in September 2022 and may contact Dr. Argenia Doss at argenia.doss@nih.gov or by phone at 301-827-1373 for further information.