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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  • I80.213—

    Phlebitis and thrombophlebitis of iliac vein, bilateral

  • I80.219—

    Phlebitis and thrombophlebitis of unspecified iliac vein

  • I80.22—

    Phlebitis and thrombophlebitis of popliteal vein

  • I80.221—

    Phlebitis and thrombophlebitis of right popliteal vein

  • I80.222—

    Phlebitis and thrombophlebitis of left popliteal vein

  • I80.223—

    Phlebitis and thrombophlebitis of popliteal vein, bilateral

  • I80.229—

    Phlebitis and thrombophlebitis of unspecified popliteal vein

  • I80.23—

    Phlebitis and thrombophlebitis of tibial vein

  • I80.231—

    Phlebitis and thrombophlebitis of right tibial vein

  • I80.232—

    Phlebitis and thrombophlebitis of left tibial vein

  • I80.233—

    Phlebitis and thrombophlebitis of tibial vein, bilateral

  • I80.239—

    Phlebitis and thrombophlebitis of unspecified tibial vein

  • I80.24—

    Phlebitis and thrombophlebitis of peroneal vein

  • I80.241—

    Phlebitis and thrombophlebitis of right peroneal vein

  • I80.242—

    Phlebitis and thrombophlebitis of left peroneal vein

  • I80.243—

    Phlebitis and thrombophlebitis of peroneal vein, bilateral

  • I80.249—

    Phlebitis and thrombophlebitis of unspecified peroneal vein

  • I80.25—

    Phlebitis and thrombophlebitis of calf muscular vein

  • I80.251—

    Phlebitis and thrombophlebitis of right calf muscular vein

  • I80.252—

    Phlebitis and thrombophlebitis of left calf muscular vein

  • I80.253—

    Phlebitis and thrombophlebitis of calf muscular vein, bilateral

  • I80.259—

    Phlebitis and thrombophlebitis of unspecified calf muscular vein

  • I80.29—

    Phlebitis and thrombophlebitis of other deep vessels of lower extremities

  • I80.291—

    Phlebitis and thrombophlebitis of other deep vessels of right lower extremity

  • I80.292—

    Phlebitis and thrombophlebitis of other deep vessels of left lower extremity

  • I80.293—

    Phlebitis and thrombophlebitis of other deep vessels of lower extremity, bilateral

  • I80.299—

    Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity

  • I80.3—

    Phlebitis and thrombophlebitis of lower extremities, unspecified

  • I80.8—

    Phlebitis and thrombophlebitis of other sites

  • I80.9—

    Phlebitis and thrombophlebitis of unspecified site

  • I81—

    Portal vein thrombosis

  • I82—

    Other venous embolism and thrombosis

  • I82.0—

    Budd-Chiari syndrome

  • I82.1—

    Thrombophlebitis migrans

  • I82.2—

    Embolism and thrombosis of vena cava and other thoracic veins

  • I82.21—

    Embolism and thrombosis of superior vena cava

  • I82.210—

    Acute embolism and thrombosis of superior vena cava

  • I82.211—

    Chronic embolism and thrombosis of superior vena cava

  • I82.22—

    Embolism and thrombosis of inferior vena cava

  • I82.220—

    Acute embolism and thrombosis of inferior vena cava

  • I82.221—

    Chronic embolism and thrombosis of inferior vena cava

  • I82.29—

    Embolism and thrombosis of other thoracic veins

  • I82.290—

    Acute embolism and thrombosis of other thoracic veins

  • I82.291—

    Chronic embolism and thrombosis of other thoracic veins

  • I82.3—

    Embolism and thrombosis of renal vein

  • I82.4—

    Acute embolism and thrombosis of deep veins of lower extremity

  • I82.40—

    Acute embolism and thrombosis of unspecified deep veins of lower extremity

  • I82.401—

    Acute embolism and thrombosis of unspecified deep veins of right lower extremity

  • I82.402—

    Acute embolism and thrombosis of unspecified deep veins of left lower extremity

  • I82.403—

    Acute embolism and thrombosis of unspecified deep veins of lower extremity, bilateral

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