Convert ICD-10 Code G44.019 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
G44.019 Episodic cluster headache, not intractable		339.01 Episodc cluster headache
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 G44.019 - episodic cluster headache, not intractable based on the most recent General Equivalence Mappings (GEMS) information.