Convert ICD-10 Code O29.40 to ICD-9

Source ICD-10 Code		Target ICD-9 Code
O29.40 Spinal and epidur anesth induce hdache during preg, unsp tri		646.80 Preg compl NEC-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.

ICD-10 to ICD-9 crosswalk for code O29.40 - spinal and epidural anesthesia induced headache during pregnancy, unspecified trimester based on the most recent General Equivalence Mappings (GEMS) information.