Chapter 9

I00–I99: Diseases of the Circulatory System

Diseases of the Circulatory System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)

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.-)

All Codes Billable Only

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Internal Codes

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I00|
Rheumatic fever without heart involvement
I01|
Rheumatic fever with heart involvement
I01.0|
Acute rheumatic pericarditis
I01.1|
Acute rheumatic endocarditis
I01.2|
Acute rheumatic myocarditis
I01.8|
Other acute rheumatic heart disease
I01.9|
Acute rheumatic heart disease, unspecified
I02|
Rheumatic chorea
I02.0|
Rheumatic chorea with heart involvement
I02.9|
Rheumatic chorea without heart involvement
I05|
Rheumatic mitral valve diseases
I05.0|
Rheumatic mitral stenosis
I05.1|
Rheumatic mitral insufficiency
I05.2|
Rheumatic mitral stenosis with insufficiency
I05.8|
Other rheumatic mitral valve diseases
I05.9|
Rheumatic mitral valve disease, unspecified
I06|
Rheumatic aortic valve diseases
I06.0|
Rheumatic aortic stenosis
I06.1|
Rheumatic aortic insufficiency
I06.2|
Rheumatic aortic stenosis with insufficiency
I06.8|
Other rheumatic aortic valve diseases
I06.9|
Rheumatic aortic valve disease, unspecified
I07|
Rheumatic tricuspid valve diseases
I07.0|
Rheumatic tricuspid stenosis
I07.1|
Rheumatic tricuspid insufficiency
I07.2|
Rheumatic tricuspid stenosis and insufficiency
I07.8|
Other rheumatic tricuspid valve diseases
I07.9|
Rheumatic tricuspid valve disease, unspecified
I08|
Multiple valve diseases
I08.0|
Rheumatic disorders of both mitral and aortic valves
I08.1|
Rheumatic disorders of both mitral and tricuspid valves
I08.2|
Rheumatic disorders of both aortic and tricuspid valves
I08.3|
Combined rheumatic disorders of mitral, aortic and tricuspid valves
I08.8|
Other rheumatic multiple valve diseases
I08.9|
Rheumatic multiple valve disease, unspecified
I09|
Other rheumatic heart diseases
I09.0|
Rheumatic myocarditis
I09.1|
Rheumatic diseases of endocardium, valve unspecified
I09.2|
Chronic rheumatic pericarditis
I09.8|
Other specified rheumatic heart diseases
I09.81|
Rheumatic heart failure
I09.89|
Other specified rheumatic heart diseases
I09.9|
Rheumatic heart disease, unspecified
I10|
Essential (primary) hypertension
I11|
Hypertensive heart disease
I11.0|
Hypertensive heart disease with heart failure
I11.9|
Hypertensive heart disease without heart failure
I12|
Hypertensive chronic kidney disease
I12.0|
Hypertensive chronic kidney disease with stage 5 chronic kidney disease or end stage renal disease
I12.9|
Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

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