O99.719 is a billable ICD code used to specify a diagnosis of diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimester. A 'billable code' is detailed enough to be used to specify a medical diagnosis.
This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code O99.719 and a single ICD9 code, 648.90 is an approximate match for comparison and conversion purposes.