Convert ICD-10 Code D89.9 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
D89.9 Disorder involving the immune mechanism, unspecified		279.9 Immune mechanism dis NOS

ICD-10 to ICD-9 crosswalk for code D89.9 - disorder involving the immune mechanism, unspecified based on the most recent General Equivalence Mappings (GEMS) information.