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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  • I13—

    Hypertensive heart and chronic kidney disease

  • I13.0—

    Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

  • I13.1—

    Hypertensive heart and chronic kidney disease without heart failure

  • I13.10—

    Hypertensive heart and chronic kidney disease without heart failure, with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

  • I13.11—

    Hypertensive heart and chronic kidney disease without heart failure, with stage 5 chronic kidney disease, or end stage renal disease

  • I13.2—

    Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease

  • I15—

    Secondary hypertension

  • I15.0—

    Renovascular hypertension

  • I15.1—

    Hypertension secondary to other renal disorders

  • I15.2—

    Hypertension secondary to endocrine disorders

  • I15.8—

    Other secondary hypertension

  • I15.9—

    Secondary hypertension, unspecified

  • I16—

    Hypertensive crisis

  • I16.0—

    Hypertensive urgency

  • I16.1—

    Hypertensive emergency

  • I16.9—

    Hypertensive crisis, unspecified

  • I1A—

    Other hypertension

  • I1A.0—

    Resistant hypertension

  • I20—

    Angina pectoris

  • I20.0—

    Unstable angina

  • I20.1—

    Angina pectoris with documented spasm

  • I20.2—

    Refractory angina pectoris

  • I20.8—

    Other forms of angina pectoris

  • I20.81—

    Angina pectoris with coronary microvascular dysfunction

  • I20.89—

    Other forms of angina pectoris

  • I20.9—

    Angina pectoris, unspecified

  • I21—

    Acute myocardial infarction

  • I21.0—

    ST elevation (STEMI) myocardial infarction of anterior wall

  • I21.01—

    ST elevation (STEMI) myocardial infarction involving left main coronary artery

  • I21.02—

    ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery

  • I21.09—

    ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall

  • I21.1—

    ST elevation (STEMI) myocardial infarction of inferior wall

  • I21.11—

    ST elevation (STEMI) myocardial infarction involving right coronary artery

  • I21.19—

    ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall

  • I21.2—

    ST elevation (STEMI) myocardial infarction of other sites

  • I21.21—

    ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

  • I21.29—

    ST elevation (STEMI) myocardial infarction involving other sites

  • I21.3—

    ST elevation (STEMI) myocardial infarction of unspecified site

  • I21.4—

    Non-ST elevation (NSTEMI) myocardial infarction

  • I21.9—

    Acute myocardial infarction, unspecified

  • I21.A—

    Other type of myocardial infarction

  • I21.A1—

    Myocardial infarction type 2

  • I21.A9—

    Other myocardial infarction type

  • I21.B—

    Myocardial infarction with coronary microvascular dysfunction

  • I22—

    Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

  • I22.0—

    Subsequent ST elevation (STEMI) myocardial infarction of anterior wall

  • I22.1—

    Subsequent ST elevation (STEMI) myocardial infarction of inferior wall

  • I22.2—

    Subsequent non-ST elevation (NSTEMI) myocardial infarction

  • I22.8—

    Subsequent ST elevation (STEMI) myocardial infarction of other sites

  • I22.9—

    Subsequent ST elevation (STEMI) myocardial infarction of unspecified site

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