Convert ICD-10 Code K21.9 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
K21.9 Gastro-esophageal reflux disease without esophagitis		530.81 Esophageal reflux

ICD-10 to ICD-9 crosswalk for code K21.9 - gastro-esophageal reflux disease without esophagitis based on the most recent General Equivalence Mappings (GEMS) information.