Convert ICD-10 Code O66.1 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
O66.1 Obstructed labor due to locked twins		660.51 Locked twins-delivered
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 O66.1 - obstructed labor due to locked twins based on the most recent General Equivalence Mappings (GEMS) information.