2026 ICD-10-CM Diagnosis Code K46.1Unspecified abdominal hernia with gangrene

ICD-10-CM Codes›K00–K95›K40-K46›K46

ICD-10-CM K46.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K46.1 is a billable ICD-10-CM diagnosis code for unspecified abdominal hernia with gangrene. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. Coders also document this condition as hernia of abdominal wall with gangrene. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abdominal hernia and Gangrene.

Code Identity

ICD-10-CM Code
K46.1
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified abdominal hernia with gangrene
Short Description
Unspecified abdominal hernia with gangrene
Same as the full description in the CMS dataset.
Parent Code
K46
Unspecified abdominal hernia

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK40-K46Hernia
CategoryK46Unspecified abdominal hernia
This CodeK46.1Unspecified abdominal hernia with gangrene

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hernia of abdominal wall with gangrene
  • Hernia of anterior abdominal wall with gangrene
  • Hernia of anterior abdominal wall with obstruction AND gangrene
  • Hernia, with gangrene
  • Internal hernia of abdomen with gangrene
  • Recurrent hernia of anterior abdominal wall with gangrene

Tabular List NotesGuidance

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

Inclusion Terms

  • Any condition listed under K46

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.

    • Hernia, hernial(acquired) (recurrent)
      • abdomen, abdominal
        • with
          • gangrene (and obstruction)
    • Incarceration, incarcerated
      • enterocele
        • gangrenous
    • Incarceration, incarcerated
      • epiplocele
        • gangrenous
    • Incarceration, incarcerated
      • sarcoepiplocele
        • gangrenous

Clinical ClassificationClinical

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

CCSR DIG010
Abdominal hernia
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR028
Gangrene
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Abdominal Hernia

    the protrusion of abdominal contents through a congenital or acquired defect in the abdominal wall.

Patient EducationClinical

Gangrene

Gangrene is the death of tissues in your body. It happens when a part of your body loses its blood supply. Gangrene can happen on the surface of the body, such as on the skin, or inside the body, in muscles or organs. Causes include:

Read the full article at MedlinePlus

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

Convert K46.1 to ICD-9-CMHistory

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

ICD-9-CM
551.9 Hernia, site NOS w gangr
Exact Match The mapping is direct, with no qualifiers.

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 K46.1Overview

Is K46.1 (Unspecified abdominal hernia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified abdominal hernia with gangrene on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K46.1 group to?

When unspecified abdominal hernia with gangrene is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K46.1?

Under the General Equivalence Mappings, unspecified abdominal hernia with gangrene converts to ICD-9-CM 551.9 (hernia, site NOS w gangr). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.