Any non-syndromic X-linked intellectual disability in which the cause of the disease is a mutation in the IL1RAPL1 gene. The disease is Monarch Disease Ontology term MONDO_0010256 (intellectual disability, X-linked 21). Also known as: IL1RAPL1 non-syndromic X-linked intellectual disability, intellectual developmental disorder, X-linked 21, X-linked recessive, intellectual disability, X-linked type 21, mental retardation, X-linked type 21, non-syndromic X-linked intellectual disability caused by mutation in IL1RAPL1.