2026 ICD-10-CM Diagnosis Code J04.31Supraglottitis, unspecified, with obstruction

ICD-10-CM Codes›J00–J99›J00-J06›J04

ICD-10-CM J04.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J04.31 is a billable ICD-10-CM diagnosis code for supraglottitis, unspecified, with obstruction. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 152 through 153. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 21 closely related codes. Coders also document this condition as laryngeal obstruction due to supraglottitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified upper respiratory infections.

Code Identity

ICD-10-CM Code
J04.31
Billable Status
Yes — Valid for Submission
Code Describes
Supraglottitis, unspecified, with obstruction
Short Description
Supraglottitis, unspecified, with obstruction
Same as the full description in the CMS dataset.
Parent Code
J04.3
Supraglottitis, unspecified

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ00-J06Acute upper respiratory infections
CategoryJ04Acute laryngitis and tracheitis
This CodeJ04.31Supraglottitis, unspecified, with obstruction

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Laryngeal obstruction due to supraglottitis

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 RSP006
Other specified upper respiratory infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Supraglottitis

    inflammation of the epiglottis and supraglottic structures including the pharynx; uvula; base of tongue; and aryepiglottic folds. it is usually caused by haemophilus influenzae in children but often by different organisms in adults.

Patient EducationClinical

Throat Disorders

Your throat is a tube that carries food to your esophagus and air to your windpipe and larynx. The technical name for your throat is the pharynx.

Read the full article at MedlinePlus

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

Convert J04.31 to ICD-9-CMHistory

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

ICD-9-CM
464.51 Supraglottis w obstr NOS
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 J04.31Overview

What is the ICD-10 code for supraglottitis, unspecified, with obstruction?

The ICD-10-CM code for supraglottitis, unspecified, with obstruction is J04.31 (sometimes written as J0431). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is J04.31 (Supraglottitis, unspecified) a billable code?

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

What MS-DRG does J04.31 group to?

When supraglottitis, unspecified, with obstruction is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 152, 153, with relative weights from 0.7382 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

Is J04.31 a CC or MCC?

CMS lists J04.31 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 21 closely related codes in its exclusion list.

What is the ICD-9 equivalent of J04.31?

Under the General Equivalence Mappings, supraglottitis, unspecified, with obstruction converts to ICD-9-CM 464.51 (supraglottis w obstr NOS). The mapping is a direct match.