code requires phenotype Asymptomatic D57.2 Sickle-cell/Hb-C disease D57.20 Sickle-cell/Hb-C disease without crisis - http://www.icd10data.com/ICD10CM/Codes/D50-D89/D55-D59/D57-/D57.20 D57.20 Few but definitions not freely available ICD10CM:D57.20 Sickle-cell/Hb-C disease without crisis Sickle Cell Disease-SC without crisis Sickle Cell Disease-SC