2026 ICD-10-CM Diagnosis Code J05.0Acute obstructive laryngitis [croup]

ICD-10-CM Codes›J00–J99›J00-J06›J05

ICD-10-CM J05.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J05.0 is a billable ICD-10-CM diagnosis code for acute obstructive laryngitis [croup]. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 152 through 153. Coders also document this condition as acute laryngitis with obstruction. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified upper respiratory infections.

Code Identity

ICD-10-CM Code
J05.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute obstructive laryngitis [croup]
Short Description
Acute obstructive laryngitis [croup]
Same as the full description in the CMS dataset.
Parent Code
J05
Acute obstructive laryngitis [croup] and epiglottitis

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ00-J06Acute upper respiratory infections
CategoryJ05Acute obstructive laryngitis [croup] and epiglottitis
This CodeJ05.0Acute obstructive laryngitis [croup]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute laryngitis with obstruction
  • Acute laryngotracheitis
  • Acute laryngotracheitis with obstruction
  • Acute tracheitis
  • Allergic bronchitis
  • Croup
  • Laryngotracheobronchitis
  • Recurrent allergic croup
  • Recurrent croup

Tabular List NotesGuidance

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

Inclusion Terms

  • Obstructive laryngitis (acute) NOS
  • Obstructive laryngotracheitis NOS

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.

    • Angina(attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
      • croupous
    • Angina(attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
      • membranous
    • Angina(attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
      • trachealis
    • Croup, croupous(catarrhal) (infectious) (inflammatory) (nondiphtheritic)
    • Laryngitis(acute) (edematous) (fibrinous) (infective) (infiltrative) (malignant) (membranous) (phlegmonous) (pneumococcal) (pseudomembranous) (septic) (subglottic) (suppurative) (ulcerative)
      • obstructive
    • Laryngitis(acute) (edematous) (fibrinous) (infective) (infiltrative) (malignant) (membranous) (phlegmonous) (pneumococcal) (pseudomembranous) (septic) (subglottic) (suppurative) (ulcerative)
      • spasmodic
    • Laryngitis(acute) (edematous) (fibrinous) (infective) (infiltrative) (malignant) (membranous) (phlegmonous) (pneumococcal) (pseudomembranous) (septic) (subglottic) (suppurative) (ulcerative)
      • stridulous
    • Laryngotracheitis(acute) (Infectional) (infective) (viral)
      • spasmodic
        • acute
    • Syndrome
      • croup

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

Patient EducationClinical

Croup

Croup is an inflammation of the vocal cords (larynx) and windpipe (trachea). It causes difficulty breathing, a barking cough, and a hoarse voice. The cause is usually a virus, often parainfluenza virus. Other causes include allergies and reflux.

Read the full article at MedlinePlus

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

Convert J05.0 to ICD-9-CMHistory

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

ICD-9-CM
464.01 Ac laryngitis w obstruct
Approximate The match is approximate rather than exact.
ICD-9-CM
464.21 Ac laryngotrach w obstr
Approximate The match is approximate rather than exact.
ICD-9-CM
464.4 Croup
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 J05.0Overview

Is J05.0 (Acute obstructive laryngitis [croup] and epiglottitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute obstructive laryngitis [croup] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J05.0 group to?

When acute obstructive laryngitis [croup] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 152, 153, with relative weights from 0.7382 to 1.1822 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J05.0?

Under the General Equivalence Mappings, acute obstructive laryngitis [croup] converts to ICD-9-CM 464.01 (ac laryngitis w obstruct), 464.21 (ac laryngotrach w obstr), and 464.4 (croup). The mapping is approximate, so confirm the match fits the documentation.

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.