I81 Portal vein thrombosis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Portal (vein) obstruction

Excludes2 (not included here)

• hepatic vein thrombosis (I82.0)
• phlebitis of portal vein (K75.1)

Applies from I81 Portal vein thrombosis

Applicable to

• Portal (vein) obstruction

Excludes2 (not included here)

• hepatic vein thrombosis (I82.0)
• phlebitis of portal vein (K75.1)

MS-DRG index

Defines the logic of DRG(s) 441-443 in MDC 07.

Approximate ICD-9-CM (GEMs)

• 452 Portal vein thrombosis

Code annotations containing back-references to I81

Back-references to I81

• Type 2 Excludes: I82 Other venous embolism and thrombosis ("portal (I81)")
• Type 2 Excludes: K76 Other diseases of liver ("portal vein thrombosis (I81)")

Back-references to I81

• Type 2 Excludes: I82 Other venous embolism and thrombosis ("portal (I81)")
• Type 2 Excludes: K76 Other diseases of liver ("portal vein thrombosis (I81)")

Diagnosis Index entries for I81

• Block, blocked › portal (vein)
• Embolism (multiple) (paradoxical) › portal (vein)
• Obstruction, obstructed, obstructive › portal (circulation) (vein)
• Pseudoangioma
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › liver (venous) › portal vein
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › portal

Nearby codes

• I81 Portal vein thrombosis (this code)