Disease Phenotype Comorbid Disease Co-Existing Disease Additional Disease Co-Morbid Disease A co-existing or additional disease with reference to an initial diagnosis or with reference to the index condition that is the subject of study. Request inclusion into relevant ontology As per: "Transition and Sickle Cell Disease" by Michael R. DeBaun, Joseph Telfair -- Include here: -- Asthma -- Osteonecrosis of the Femoral Head -- Restrictive Lung Disease (currently Chronic Restrictive Lung Disease in SCDO) -- Retinopathy -- Cardiac Dysfunction -- Renal Dysfunction/Renal Failure -- -- ...and others SCDO (Jade Hotchkiss) Co-Morbid Condition Few but definitions not freely available