Convert ICD-10 Code I31.1 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
I31.1 Chronic constrictive pericarditis		423.2 Constrictiv pericarditis

ICD-10 to ICD-9 crosswalk for code I31.1 - chronic constrictive pericarditis based on the most recent General Equivalence Mappings (GEMS) information.