ICD-10-CM · Chapter 9 · I00-I99
Diseases of the circulatory system
1,433 billable diagnosis codes across 10 code blocks. FY2027 release.
Excludes 2 (not included here)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
I00-I02 Acute rheumatic fever
I05-I09 Chronic rheumatic heart diseases
I10-I1A Hypertensive diseases
I20-I25 Ischemic heart diseases
- I20 Angina pectoris
- I21 Acute myocardial infarction
- I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
- I23 Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
- I24 Other acute ischemic heart diseases
- I25 Chronic ischemic heart disease
I26-I28 Pulmonary heart disease and diseases of pulmonary circulation
I30-I5A Other forms of heart disease
- I30 Acute pericarditis
- I31 Other diseases of pericardium
- I32 Pericarditis in diseases classified elsewhere Billable
- I33 Acute and subacute endocarditis
- I34 Nonrheumatic mitral valve disorders
- I35 Nonrheumatic aortic valve disorders
- I36 Nonrheumatic tricuspid valve disorders
- I37 Nonrheumatic pulmonary valve disorders
- I38 Endocarditis, valve unspecified Billable
- I39 Endocarditis and heart valve disorders in diseases classified elsewhere Billable
- I40 Acute myocarditis
- I41 Myocarditis in diseases classified elsewhere Billable
- I42 Cardiomyopathy
- I43 Cardiomyopathy in diseases classified elsewhere Billable
- I44 Atrioventricular and left bundle-branch block
- I45 Other conduction disorders
- I46 Cardiac arrest
- I47 Paroxysmal tachycardia
- I48 Atrial fibrillation and flutter
- I49 Other cardiac arrhythmias
- I50 Heart failure
- I51 Complications and ill-defined descriptions of heart disease
- I52 Other heart disorders in diseases classified elsewhere Billable
- I5A Non-ischemic myocardial injury (non-traumatic) Billable
I60-I69 Cerebrovascular diseases
- I60 Nontraumatic subarachnoid hemorrhage
- I61 Nontraumatic intracerebral hemorrhage
- I62 Other and unspecified nontraumatic intracranial hemorrhage
- I63 Cerebral infarction
- I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
- I66 Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
- I67 Other cerebrovascular diseases
- I68 Cerebrovascular disorders in diseases classified elsewhere
- I69 Sequelae of cerebrovascular disease
I70-I79 Diseases of arteries, arterioles and capillaries
- I70 Atherosclerosis
- I71 Aortic aneurysm and dissection
- I72 Other aneurysm
- I73 Other peripheral vascular diseases
- I74 Arterial embolism and thrombosis
- I75 Atheroembolism
- I76 Septic arterial embolism Billable
- I77 Other disorders of arteries and arterioles
- I78 Diseases of capillaries
- I79 Disorders of arteries, arterioles and capillaries in diseases classified elsewhere
I80-I89 Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
- I80 Phlebitis and thrombophlebitis
- I81 Portal vein thrombosis Billable
- I82 Other venous embolism and thrombosis
- I83 Varicose veins of lower extremities
- I85 Esophageal varices
- I86 Varicose veins of other sites
- I87 Other disorders of veins
- I88 Nonspecific lymphadenitis
- I89 Other noninfective disorders of lymphatic vessels and lymph nodes
I95-I99 Other and unspecified disorders of the circulatory system
Last reviewed: September 2026