NCIthesaurus sleep apnea obstructive sleep apnea A sleep apnea that is characterized by repeated collapse and obstruction of the upper airway during sleep, which results in reduced airflow (hypopnea) or complete airflow cessation (apnea), oxygen desaturation, and arousals from sleep. disease_ontology SNOMEDCT_US_2025_09_01:194441007 DOID:0050848 MESH:D020181 2014-03-20T03:57:22Z ICD9CM:327.23 ICD10CM:G47.33 MIM:107650 NCI:C116337 UMLS_CUI:C0520679 Xref MGI. obstructive sleep apnea syndrome