Diseases of the circulatory system (I00–I99)

Chapter 9 (I00–I99) covers conditions that affect the heart, blood vessels, and overall blood circulation. These codes are used to classify diseases like heart attacks, high blood pressure, and strokes for diagnosis and treatment records.

This chapter includes a wide variety of circulatory system disorders, ranging from heart diseases such as ischemic heart disease and arrhythmias to vascular problems like hypertension and peripheral artery disease. It also encompasses cerebrovascular diseases, which involve blood flow to the brain and can lead to strokes. These codes help healthcare professionals document and manage conditions related to the heart's function, blood vessels’ health, and circulation abnormalities, facilitating appropriate medical care and monitoring of chronic cardiovascular illnesses.