Atrial fibrillation 427.31 http://purl.bioontology.org/ontology/ICD9CM/427.31 Atrial fibrillation CHD Atrial fibrillation and flutter 427.3 http://purl.bioontology.org/ontology/ICD9CM/427.3 ChildCount 2 class ChildCount 0 SY Atrial fibrillation 427.31 http://purl.bioontology.org/ontology/ICD9CM/427.31 ChildCount 0 class Semantic_Type Pathologic Function TUI T046 SYNONYM AB Atrial fibrillation UMLS_CUI C0004238 SuperClass Atrial fibrillation and flutter 427.3 http://purl.bioontology.org/ontology/ICD9CM/427.3 ChildCount 2 class class