O99: Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

O99.8: Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium

Your disease makes your pregnancy, the birth or childbed more difficult. You may also already have had this kind of disease before your pregnancy. Your disease can then also have got worse as a result of your pregnancy, the birth or childbed.