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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  • I77.5—

    Necrosis of artery

  • I77.6—

    Arteritis, unspecified

  • I77.7—

    Other arterial dissection

  • I77.70—

    Dissection of unspecified artery

  • I77.71—

    Dissection of carotid artery

  • I77.72—

    Dissection of iliac artery

  • I77.73—

    Dissection of renal artery

  • I77.74—

    Dissection of vertebral artery

  • I77.75—

    Dissection of other precerebral arteries

  • I77.76—

    Dissection of artery of upper extremity

  • I77.77—

    Dissection of artery of lower extremity

  • I77.79—

    Dissection of other specified artery

  • I77.8—

    Other specified disorders of arteries and arterioles

  • I77.81—

    Aortic ectasia

  • I77.810—

    Thoracic aortic ectasia

  • I77.811—

    Abdominal aortic ectasia

  • I77.812—

    Thoracoabdominal aortic ectasia

  • I77.819—

    Aortic ectasia, unspecified site

  • I77.82—

    Antineutrophilic cytoplasmic antibody [ANCA] vasculitis

  • I77.89—

    Other specified disorders of arteries and arterioles

  • I77.9—

    Disorder of arteries and arterioles, unspecified

  • I78—

    Diseases of capillaries

  • I78.0—

    Hereditary hemorrhagic telangiectasia

  • I78.1—

    Nevus, non-neoplastic

  • I78.8—

    Other diseases of capillaries

  • I78.9—

    Disease of capillaries, unspecified

  • I79—

    Disorders of arteries, arterioles and capillaries in diseases classified elsewhere

  • I79.0—

    Aneurysm of aorta in diseases classified elsewhere

  • I79.1—

    Aortitis in diseases classified elsewhere

  • I79.8—

    Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

  • I80—

    Phlebitis and thrombophlebitis

  • I80.0—

    Phlebitis and thrombophlebitis of superficial vessels of lower extremities

  • I80.00—

    Phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity

  • I80.01—

    Phlebitis and thrombophlebitis of superficial vessels of right lower extremity

  • I80.02—

    Phlebitis and thrombophlebitis of superficial vessels of left lower extremity

  • I80.03—

    Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral

  • I80.1—

    Phlebitis and thrombophlebitis of femoral vein

  • I80.10—

    Phlebitis and thrombophlebitis of unspecified femoral vein

  • I80.11—

    Phlebitis and thrombophlebitis of right femoral vein

  • I80.12—

    Phlebitis and thrombophlebitis of left femoral vein

  • I80.13—

    Phlebitis and thrombophlebitis of femoral vein, bilateral

  • I80.2—

    Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremities

  • I80.20—

    Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities

  • I80.201—

    Phlebitis and thrombophlebitis of unspecified deep vessels of right lower extremity

  • I80.202—

    Phlebitis and thrombophlebitis of unspecified deep vessels of left lower extremity

  • I80.203—

    Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities, bilateral

  • I80.209—

    Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity

  • I80.21—

    Phlebitis and thrombophlebitis of iliac vein

  • I80.211—

    Phlebitis and thrombophlebitis of right iliac vein

  • I80.212—

    Phlebitis and thrombophlebitis of left iliac vein

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