polycythemia obsolete rare genetic hematologic disease secondary polycythemia https://github.com/monarch-initiative/mondo/issues/9097 MONDO:0020115 secondary erythrocytosis secondary polycythemia MEDGEN:231144 ICD10CM:D75.1 Secondary polycythemia is an elevated absolute red blood cell mass caused by enhanced stimulation of red blood cell production by an otherwise normal erythroid lineage that may be congenital or acquired (congenital secondary polycythemia and acquired secondary polycythemia). GARD:0019467 UMLS:C1318533 NCIT:C27178 Orphanet:98428 MedDRA:10036062