DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

I81 diagnosis code · Billable category · FY2027

I81 Portal vein thrombosis

  • Billable
  • MCC
  • POA reported

I81 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I80-I89 Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89)
  3. I81 Portal vein thrombosis
CC / MCC
MCC
MS-DRG
441-443
HCC V28
–
POA
Reported
Code Editor
–
Index entries
6

Instructions

At I81

Inclusion terms

  • Portal (vein) obstruction

Excludes2

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

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Pseudoangioma → I81
  • Block, blockedportal (vein) → I81
  • Embolism (multiple) (paradoxical)portal (vein) → I81
  • Obstruction, obstructed, obstructiveportal (circulation) (vein) → I81
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)portal → I81
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)liver (venous)portal vein → I81

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for I81
CC / MCCMCC
PDX exclusion list0951 (202 codes)
Appendix BMDC 07 Diseases and Disorders of the Hepatobiliary System and Pancreas, MS-DRG 441-443 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC…)
Code Editor–
POAReported
HCC V28–

MCC as a secondary diagnosis, not when the principal diagnosis is on its PDX exclusion list.

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy