2027 ICD-10-CM Diagnosis Code K42.9Umbilical hernia without obstruction or gangrene

ICD-10-CM Codes›K00–K95›K40-K46›K42

ICD-10-CM K42.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K42.9 is a billable ICD-10-CM diagnosis code for umbilical hernia without obstruction or gangrene. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. Coders also document this condition as paraumbilical hernia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abdominal hernia.

Code Identity

ICD-10-CM Code
K42.9
Billable Status
Yes — Valid for Submission
Code Describes
Umbilical hernia without obstruction or gangrene
Short Description
Umbilical hernia without obstruction or gangrene
Same as the full description in the CMS dataset.
Parent Code
K42
Umbilical hernia

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK40-K46Hernia
CategoryK42Umbilical hernia
This CodeK42.9Umbilical hernia without obstruction or gangrene

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Paraumbilical hernia
  • Protruding umbilicus
  • Recurrent paraumbilical hernia
  • Recurrent umbilical hernia
  • Reducible umbilical hernia
  • Umbilical hernia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K42.9: its own notes plus those printed at K42, block K40-K46, and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From K42 Umbilical hernia applies to 3 codes
  • paraumbilical hernia
From Block K40-K46 Hernia applies to 45 codes
  • acquired hernia
  • congenital [except diaphragmatic or hiatus] hernia
  • recurrent hernia

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Umbilical hernia NOS

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From K42 Umbilical hernia applies to 3 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • 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)

Notes

General instructions on how these codes are used.

From Block K40-K46 Hernia applies to 45 codes
  • Hernia with both gangrene and obstruction is classified to hernia with gangrene.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K42.9, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming K42.9: they are not reported together with it, unless the two conditions are unrelated.

  • Q79.2 Exomphalos
    umbilical hernia (K42.-) names K42.-, which includes this code
  • Q79.5 Other congenital malformations of abdominal wall
    umbilical hernia (K42.-) names K42.-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming K42.9: its condition is not part of those codes, and both may be reported when the patient has both.

  • K56.7 Ileus, unspecified
    intestinal obstruction with hernia (K40-K46) names K40-K46, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR DIG010
Abdominal hernia
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Hernia, Umbilical

    a hernia due to an imperfect closure or weakness of the umbilical ring. it appears as a skin-covered protrusion at the umbilicus during crying, coughing, or straining. the hernia generally consists of omentum or small intestine. the vast majority of umbilical hernias are congenital but can be acquired due to severe abdominal distention.

Patient EducationClinical

Hernia

A hernia happens when part of an internal organ or tissue bulges through a weak area of muscle. Most hernias are in the abdomen.

Read the full article at MedlinePlus

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

Convert K42.9 to ICD-9-CMHistory

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

ICD-9-CM
553.1 Umbilical hernia
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K42.9Overview

What is the ICD-10 code for umbilical hernia without obstruction or gangrene?

The ICD-10-CM code for umbilical hernia without obstruction or gangrene is K42.9 (sometimes written as K429). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K42.9 (Umbilical hernia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report umbilical hernia without obstruction or gangrene on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K42.9 group to?

When umbilical hernia without obstruction or gangrene is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.

Can K42.9 be reported with Q79.2?

Not as a rule. The Excludes1 note at K42, which applies to K42.9, lists "omphalocele (Q79.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of K42.9?

Under the General Equivalence Mappings, umbilical hernia without obstruction or gangrene converts to ICD-9-CM 553.1 (umbilical hernia). The mapping is a direct match.