I81 — Portal vein thrombosis
Is I81 billable?
Yes — I81 is billable for FY2027. I81 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I81 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I81 at a glance
| Code | I81 |
|---|---|
| Description | Portal vein thrombosis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I81 group to?
I81 sits in MDC 07 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 441Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCCmedical
- 442Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CCmedical
- 443Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCCmedical
As a secondary diagnosis, I81 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is I81 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I81. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Pseudoangioma
- Block, blocked › portal
- Embolism › portal (multiple) (paradoxical)
- Obstruction, obstructed, obstructive › portal
- Thrombosis, thrombotic › portal (bland) (multiple) (progressive) (silent) (vessel)
- Thrombosis, thrombotic › liver › portal vein (bland) (multiple) (progressive) (silent) (vessel)
Excludes2 — not included here
The conditions below are not part of I81, but a patient may have both at the same time. When documentation supports it, I81 and the excluded code may both be reported.
Inclusion terms
Alternative wording in documentation that is classified to I81.
- Portal (vein) obstruction
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I81, but a patient may have both at the same time. When documentation supports it, I81 and the excluded code may both be reported.
- 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.-)
How long has I81 existed?
I81 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.