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

O99.4: Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium

The heart pumps blood through the blood vessels to the body. The blood then flows back to the heart through other blood vessels. Together, the heart and the blood vessels form the blood circulatory system. Blood supplies oxygen and nutrients to the tissue in the body.

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.