Convert ICD-10 Code O11.9 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
O11.9 Pre-existing hypertension with pre-eclampsia, unsp trimester		642.20 Old hyperten preg-unspec
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.
O11.9 Pre-existing hypertension with pre-eclampsia, unsp trimester		642.70 Tox w old hyperten-unsp
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 O11.9 - pre-existing hypertension with pre-eclampsia, unspecified trimester based on the most recent General Equivalence Mappings (GEMS) information.