2019 ICD-10-CM Diagnosis Code I81

Portal vein thrombosis

    2016 2017 2018 2019 Billable/Specific Code
  • I81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM I81 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of I81 - other international versions of ICD-10 I81 may differ.
Applicable To
  • Portal (vein) obstruction
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (I81) and the excluded code together.
  • hepatic vein thrombosis (
    ICD-10-CM Diagnosis Code I82.0

    Budd-Chiari syndrome

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Hepatic vein thrombosis
    I82.0
    )
  • phlebitis of portal vein (
    ICD-10-CM Diagnosis Code K75.1

    Phlebitis of portal vein

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Pylephlebitis
    Type 1 Excludes
    • pylephlebitic liver abscess (K75.0)
    K75.1
    )
The following code(s) above I81 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I81:
  • I00-I99
    2019 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • 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.-)
    Diseases of the circulatory system
Approximate Synonyms
  • Thrombosis of portal vein
Clinical Information
  • A disorder characterized by the formation of a thrombus (blood clot) in the portal vein.
  • The formation of a blood clot (thrombus) in the portal vein.
ICD-10-CM I81 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 441 Disorders of liver except malignancy, cirrhosis or alcoholic hepatitis with mcc
  • 442 Disorders of liver except malignancy, cirrhosis or alcoholic hepatitis with cc
  • 443 Disorders of liver except malignancy, cirrhosis or alcoholic hepatitis without cc/mcc

Convert I81 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
Code annotations containing back-references to I81:
  • Type 2 Excludes: I82
    , K76
    ICD-10-CM Diagnosis Code I82

    Other venous embolism and thrombosis

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Code First
    • venous embolism and thrombosis complicating:
    • abortion, ectopic or molar pregnancy (O00-O07, O08.7)
    • pregnancy, childbirth and the puerperium (O22.-, O87.-)
    Type 2 Excludes
    • venous embolism and thrombosis (of):
    • cerebral (I63.6, I67.6)
    • coronary (I21-I25)
    • intracranial and intraspinal, septic or NOS (G08)
    • intracranial, nonpyogenic (I67.6)
    • intraspinal, nonpyogenic (G95.1)
    • mesenteric (K55.0-)
    • portal (I81)
    • pulmonary (I26.-)
    ICD-10-CM Diagnosis Code K76

    Other diseases of liver

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • alcoholic liver disease (K70.-)
    • amyloid degeneration of liver (E85.-)
    • cystic disease of liver (congenital) (Q44.6)
    • hepatic vein thrombosis (I82.0)
    • hepatomegaly NOS (R16.0)
    • pigmentary cirrhosis (of liver) (E83.110)
    • portal vein thrombosis (I81)
    • toxic liver disease (K71.-)

Diagnosis Index entries containing back-references to I81:
  • Block, blocked
    • portal I81 (vein)
  • Embolism (multiple) (paradoxical) I74.9
    ICD-10-CM Diagnosis Code I74.9

    Embolism and thrombosis of unspecified artery

      2016 2017 2018 2019 Billable/Specific Code
    • portal I81 (vein)
  • Obstruction, obstructed, obstructive
    • portal I81 (circulation) (vein)
  • Pseudoangioma I81
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) I82.90
    ICD-10-CM Diagnosis Code I82.90

    Acute embolism and thrombosis of unspecified vein

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Embolism of vein NOS
    • Thrombosis (vein) NOS
    • liver (venous) I82.0
      ICD-10-CM Diagnosis Code I82.0

      Budd-Chiari syndrome

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Hepatic vein thrombosis
      • portal vein I81
    • mesenteric (artery) (with gangrene) K55.069
      - see also Infarct, intestine
      ICD-10-CM Diagnosis Code K55.069

      Acute infarction of intestine, part and extent unspecified

        2017 - New Code 2018 2019 Billable/Specific Code
      • vein I81 (inferior) (superior)
    • portal I81

ICD-10-CM Codes Adjacent To I81
I80.233 …… bilateral
I80.239 Phlebitis and thrombophlebitis of unspecified tibial 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

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.