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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  • I87.321—

    Chronic venous hypertension (idiopathic) with inflammation of right lower extremity

  • I87.322—

    Chronic venous hypertension (idiopathic) with inflammation of left lower extremity

  • I87.323—

    Chronic venous hypertension (idiopathic) with inflammation of bilateral lower extremity

  • I87.329—

    Chronic venous hypertension (idiopathic) with inflammation of unspecified lower extremity

  • I87.33—

    Chronic venous hypertension (idiopathic) with ulcer and inflammation

  • I87.331—

    Chronic venous hypertension (idiopathic) with ulcer and inflammation of right lower extremity

  • I87.332—

    Chronic venous hypertension (idiopathic) with ulcer and inflammation of left lower extremity

  • I87.333—

    Chronic venous hypertension (idiopathic) with ulcer and inflammation of bilateral lower extremity

  • I87.339—

    Chronic venous hypertension (idiopathic) with ulcer and inflammation of unspecified lower extremity

  • I87.39—

    Chronic venous hypertension (idiopathic) with other complications

  • I87.391—

    Chronic venous hypertension (idiopathic) with other complications of right lower extremity

  • I87.392—

    Chronic venous hypertension (idiopathic) with other complications of left lower extremity

  • I87.393—

    Chronic venous hypertension (idiopathic) with other complications of bilateral lower extremity

  • I87.399—

    Chronic venous hypertension (idiopathic) with other complications of unspecified lower extremity

  • I87.8—

    Other specified disorders of veins

  • I87.9—

    Disorder of vein, unspecified

  • I88—

    Nonspecific lymphadenitis

  • I88.0—

    Nonspecific mesenteric lymphadenitis

  • I88.1—

    Chronic lymphadenitis, except mesenteric

  • I88.8—

    Other nonspecific lymphadenitis

  • I88.9—

    Nonspecific lymphadenitis, unspecified

  • I89—

    Other noninfective disorders of lymphatic vessels and lymph nodes

  • I89.0—

    Lymphedema, not elsewhere classified

  • I89.1—

    Lymphangitis

  • I89.8—

    Other specified noninfective disorders of lymphatic vessels and lymph nodes

  • I89.9—

    Noninfective disorder of lymphatic vessels and lymph nodes, unspecified

  • I95—

    Hypotension

  • I95.0—

    Idiopathic hypotension

  • I95.1—

    Orthostatic hypotension

  • I95.2—

    Hypotension due to drugs

  • I95.3—

    Hypotension of hemodialysis

  • I95.8—

    Other hypotension

  • I95.81—

    Postprocedural hypotension

  • I95.89—

    Other hypotension

  • I95.9—

    Hypotension, unspecified

  • I96—

    Gangrene, not elsewhere classified

  • I97—

    Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified

  • I97.0—

    Postcardiotomy syndrome

  • I97.1—

    Other postprocedural cardiac functional disturbances

  • I97.11—

    Postprocedural cardiac insufficiency

  • I97.110—

    Postprocedural cardiac insufficiency following cardiac surgery

  • I97.111—

    Postprocedural cardiac insufficiency following other surgery

  • I97.12—

    Postprocedural cardiac arrest

  • I97.120—

    Postprocedural cardiac arrest following cardiac surgery

  • I97.121—

    Postprocedural cardiac arrest following other surgery

  • I97.13—

    Postprocedural heart failure

  • I97.130—

    Postprocedural heart failure following cardiac surgery

  • I97.131—

    Postprocedural heart failure following other surgery

  • I97.19—

    Other postprocedural cardiac functional disturbances

  • I97.190—

    Other postprocedural cardiac functional disturbances following cardiac surgery

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