Convert ICD-10 Code D89.43 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
D89.43 Secondary mast cell activation		279.8 Immune mechanism dis NEC
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

ICD-10 to ICD-9 crosswalk for code D89.43 - secondary mast cell activation based on the most recent General Equivalence Mappings (GEMS) information.