Convert ICD-10 Code I28.9 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
I28.9 Disease of pulmonary vessels, unspecified		417.9 Pulmon circulat dis NOS

ICD-10 to ICD-9 crosswalk for code I28.9 - disease of pulmonary vessels, unspecified based on the most recent General Equivalence Mappings (GEMS) information.