Convert ICD-10 Code O10.312 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
O10.312 Pre-exist hyp heart and chr kidney dis comp preg, second tri		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.
O10.312 Pre-exist hyp heart and chr kidney dis comp preg, second tri		642.23 Old hyperten NEC-antepar
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 O10.312 - pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester based on the most recent General Equivalence Mappings (GEMS) information.