This subgroup of myeloproliferative neoplasms includes cases which do not meet the morphologic criteria of any of the defined myeloproliferative neoplasms, or which have characteristics that overlap at least two of the myeloproliferative neoplasms. The disease is myeloproliferative neoplasm, unclassifiable (MONDO_0019452). Also known as: CMPD, U, CMPD-U, MPN, U, MPN-U, chronic myeloproliferative disease, unclassifiable, chronic myeloproliferative disorder, unclassifiable, unclassifiable chronic myeloproliferative disease, unclassifiable chronic myeloproliferative disorder.