Convert ICD-10 Code K55.31 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
K55.31 Stage 1 necrotizing enterocolitis		557.0 Ac vasc insuff intestine
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 K55.31 - stage 1 necrotizing enterocolitis based on the most recent General Equivalence Mappings (GEMS) information.