All ICD10 Codes
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 CodesBillable Only
Internal Codes
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  • I23—

    Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

  • I23.0—

    Hemopericardium 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 hemopericardium as current complication following acute myocardial infarction

  • 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

  • I23.7—

    Postinfarction angina

  • I23.8—

    Other current complications following acute myocardial infarction

  • I24—

    Other acute ischemic heart diseases

  • I24.0—

    Acute coronary thrombosis not resulting in myocardial infarction

  • I24.1—

    Dressler's syndrome

  • I24.8—

    Other forms of acute ischemic heart disease

  • I24.81—

    Acute coronary microvascular dysfunction

  • I24.89—

    Other forms of acute ischemic heart disease

  • I24.9—

    Acute ischemic heart disease, unspecified

  • I25—

    Chronic ischemic heart disease

  • I25.1—

    Atherosclerotic heart disease of native coronary artery

  • I25.10—

    Atherosclerotic heart disease of native coronary artery without angina pectoris

  • I25.11—

    Atherosclerotic heart disease of native coronary artery with angina pectoris

  • I25.110—

    Atherosclerotic heart disease of native coronary artery with unstable angina pectoris

  • I25.111—

    Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm

  • I25.112—

    Atherosclerotic heart disease of native coronary artery with refractory angina pectoris

  • I25.118—

    Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris

  • I25.119—

    Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris

  • I25.2—

    Old myocardial infarction

  • I25.3—

    Aneurysm of heart

  • I25.4—

    Coronary artery aneurysm and dissection

  • I25.41—

    Coronary artery aneurysm

  • I25.42—

    Coronary artery dissection

  • I25.5—

    Ischemic cardiomyopathy

  • I25.6—

    Silent myocardial ischemia

  • I25.7—

    Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris

  • I25.70—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris

  • I25.700—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris

  • I25.701—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm

  • I25.702—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with refractory angina pectoris

  • I25.708—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectoris

  • I25.709—

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris

  • I25.71—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris

  • I25.710—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris

  • I25.711—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm

  • I25.712—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with refractory angina pectoris

  • I25.718—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with other forms of angina pectoris

  • I25.719—

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris

  • I25.72—

    Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris

  • I25.720—

    Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris

  • I25.721—

    Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm

  • I25.722—

    Atherosclerosis of autologous artery coronary artery bypass graft(s) with refractory angina pectoris

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