2026 ICD-10-CM Diagnosis Code K75.1Phlebitis of portal vein

ICD-10-CM Codes›K00–K95›K70-K77›K75

ICD-10-CM K75.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K75.1 is a billable ICD-10-CM diagnosis code for phlebitis of portal vein. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 441 through 443. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified liver disease.

Code Identity

ICD-10-CM Code
K75.1
Billable Status
Yes — Valid for Submission
Code Describes
Phlebitis of portal vein
Short Description
Phlebitis of portal vein
Same as the full description in the CMS dataset.
Parent Code
K75
Other inflammatory liver diseases

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK70-K77Diseases of liver
CategoryK75Other inflammatory liver diseases
This CodeK75.1Phlebitis of portal vein

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Phlebitis of portal vein
  • Portal pyemia
  • Portal thrombophlebitis
  • Portal vein thrombosis
  • Suppurative phlebitis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Pylephlebitis

Type 1 Excludes

  • pylephlebitic liver abscess K75.0

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • portal (vein)
    • Pyemia, pyemic(fever) (infection) (purulent)
      • liver
    • Pyemia, pyemic(fever) (infection) (purulent)
      • portal
    • Pylephlebitis
    • Pylethrombophlebitis
    • Pylethrombosis
    • Thrombophlebitis
      • portal (vein)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG019
Other specified and unspecified liver disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Liver Diseases

Your liver is the largest organ inside your body. It helps your body digest food, store energy, and remove poisons.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K75.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
572.1 Portal pyemia
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K75.1Overview

Is K75.1 (Other inflammatory liver diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis of portal vein on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K75.1 group to?

When phlebitis of portal vein is the principal diagnosis on an inpatient stay, it groups to MS-DRG 441, 442, 443, with relative weights from 0.6997 to 1.7947 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K75.1?

Under the General Equivalence Mappings, phlebitis of portal vein converts to ICD-9-CM 572.1 (portal pyemia). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.