Convert ICD-10 Code O10.12 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
O10.12 Pre-existing hypertensive heart disease comp childbirth		642.21 Old hyperten NEC-deliver
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 O10.12 - pre-existing hypertensive heart disease complicating childbirth based on the most recent General Equivalence Mappings (GEMS) information.