Chapter IX
Diseases of the circulatory system
(I00-I99)

Ischaemic heart diseases
(I20-I25)

Note: For morbidity, duration as used in categories I21-I25 refers to the interval elapsing between onset of the ischaemic episode and admission to care. For mortality, duration refers to the interval elapsing between onset and death.
Includes: with mention of hypertension ( I10-I15 )
Use additional code, if desired, to identify presence of hypertension.

I20 Angina pectoris
I20.0 Unstable angina
Angina:
· crescendo
· de novo effort
· worsening effort
Intermediate coronary syndrome
Preinfarction syndrome
I20.1 Angina pectoris with documented spasm
Angina:
· angiospastic
· Prinzmetal
· spasm-induced
· variant
I20.8 Other forms of angina pectoris
Angina of effort
Stenocardia
I20.9 Angina pectoris, unspecified
Angina:
· NOS
· cardiac
Anginal syndrome
Ischaemic chest pain

I21 Acute myocardial infarction
Includes: myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
Excludes: certain current complications following acute myocardial infarction ( I23.- )
myocardial infarction:
· old ( I25.2 )
· specified as chronic or with a stated duration of more than 4 weeks (more than 28 days) from onset ( I25.8 )
· subsequent ( I22.- )
postmyocardial infarction syndrome ( I24.1 )
I21.0 Acute transmural myocardial infarction of anterior wall
Transmural infarction (acute)(of):
· anterior (wall) NOS
· anteroapical
· anterolateral
· anteroseptal
I21.1 Acute transmural myocardial infarction of inferior wall
Transmural infarction (acute)(of):
· diaphragmatic wall
· inferior (wall) NOS
· inferolateral
· inferoposterior
I21.2 Acute transmural myocardial infarction of other sites
Transmural infarction (acute)(of):
· apical-lateral
· basal-lateral
· high lateral
· lateral (wall) NOS
· posterior (true)
· posterobasal
· posterolateral
· posteroseptal
· septal NOS
I21.3 Acute transmural myocardial infarction of unspecified site
Transmural myocardial infarction NOS
I21.4 Acute subendocardial myocardial infarction
Nontransmural myocardial infarction NOS
I21.9 Acute myocardial infarction, unspecified
Myocardial infarction (acute) NOS

I22 Subsequent myocardial infarction
Includes: recurrent myocardial infarction
Excludes: specified as chronic or with a stated duration of more than 4 weeks (more than 28 days) from onset ( I25.8 )
I22.0 Subsequent myocardial infarction of anterior wall
Subsequent infarction (acute)(of):
· anterior (wall) NOS
· anteroapical
· anterolateral
· anteroseptal
I22.1 Subsequent myocardial infarction of inferior wall
Subsequent infarction (acute)(of):
· diaphragmatic wall
· inferior (wall) NOS
· inferolateral
· inferoposterior
I22.8 Subsequent myocardial infarction of other sites
Subsequent myocardial infarction (acute)(of):
· apical-lateral
· basal-lateral
· high lateral
· lateral (wall) NOS
· posterior (true)
· posterobasal
· posterolateral
· posteroseptal
· septal NOS
I22.9 Subsequent myocardial infarction of unspecified site

I23 Certain current complications following acute myocardial infarction
Excludes: the listed conditions, when:
· concurrent with acute myocardial infarction ( I21-I22 )
· not specified as current complications following acute myocardial infarction ( I31.- , I51.- )
I23.0 Haemopericardium as current complication following acute myocardial infarction
I23.1 Atrial septal defect as current complication following acute myocardial infarction
I23.2 Ventricular septal defect as current complication following acute myocardial infarction
I23.3 Rupture of cardiac wall without haemopericardium as current complication following acute myocardial infarction
Excludes: with haemopericardium ( I23.0 )
I23.4 Rupture of chordae tendineae as current complication following acute myocardial infarction
I23.5 Rupture of papillary muscle as current complication following acute myocardial infarction
I23.6 Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
I23.8 Other current complications following acute myocardial infarction

I24 Other acute ischaemic heart diseases
Excludes: angina pectoris ( I20.- )
transient myocardial ischaemia of newborn ( P29.4 )
I24.0 Coronary thrombosis not resulting in myocardial infarction
Coronary (artery)(vein):
· embolism
· occlusion
· thromboembolism
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not resulting in myocardial infarction
Excludes: specified as chronic or with a stated duration of more than 4 weeks (more than 28 days) from onset ( I25.8 )
I24.1 Dressler's syndrome
Postmyocardial infarction syndrome
I24.8 Other forms of acute ischaemic heart disease
Coronary:
· failure
· insufficiency
I24.9 Acute ischaemic heart disease, unspecified
Excludes: ischaemic heart disease (chronic) NOS ( I25.9 )

I25 Chronic ischaemic heart disease
Excludes: cardiovascular disease NOS ( I51.6 )
I25.0 Atherosclerotic cardiovascular disease, so described
I25.1 Atherosclerotic heart disease
Coronary (artery):
· atheroma
· atherosclerosis
· disease
· sclerosis
I25.2 Old myocardial infarction
Healed myocardial infarction
Past myocardial infarction diagnosed by ECG or other special investigation, but currently presenting no symptoms
I25.3 Aneurysm of heart
Aneurysm:
· mural
· ventricular
I25.4 Coronary artery aneurysm
Coronary arteriovenous fistula, acquired
Excludes: congenital coronary (artery) aneurysm ( Q24.5 )
I25.5 Ischaemic cardiomyopathy
I25.6 Silent myocardial ischaemia
I25.8 Other forms of chronic ischaemic heart disease
Any condition in I21-I22 and I24.- specified as chronic or with a stated duration of more than 4 weeks (more than 28 days) from onset
I25.9 Chronic ischaemic heart disease, unspecified
Ischaemic heart disease (chronic) NOS