J04.0

🧬 ICD-10 CM J04.0 — Acute Laryngitis

Billable Code Confirmed

ICD-10-CM J04.0 is a valid, billable 4-character ICD-10-CM code for FY2026. The J04 category defines acute laryngitis and tracheitis, and the 0 character specifies the condition strictly as acute laryngitis. No additional characters are required.

Non-Billable Parent Codes — Never Submit These

• ❌ J04 — 3-character header — Lacks specificity regarding the exact anatomical site (larynx vs. trachea).

Always submit J04.0 (all 4 characters) when acute laryngitis is documented without airway obstruction.

Clinical Context: Absence of Obstruction

ICD-10-CM J04.0 captures acute inflammation of the larynx where airway obstruction is explicitly absent or not documented. If clinical indicators of airway compromise (e.g., stridor, barking cough, croup) are documented, this specificity shifts the code selection to J05.0 (Acute obstructive laryngitis).

Code Classification

ICD-10-CM Diagnosis Code — wRVU, assistant payable, and global period fields are not applicable; direct reader to CPT Procedural Crosswalk and ICD-10-PCS Crosswalk sections.

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🔍 Code Description

ICD-10-CM J04.0 classifies acute laryngitis. This code represents an abrupt onset of inflammation of the laryngeal mucosa and vocal cords, resulting in symptoms like hoarseness, dysphonia, and throat discomfort.

Pathophysiologically, it is most frequently caused by a viral upper respiratory tract infection (URI) such as rhinovirus or influenza, or by acute vocal strain. It is clinically distinguished from chronic laryngitis (lasting >3 weeks) and obstructive laryngitis (croup), which involves swelling severe enough to compromise the airway space.

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🌳 Code Tree / Hierarchy

J04 Acute laryngitis and tracheitis ❌ Non-billable
│
├── J04.0 Acute laryngitis ◀ THIS CODE ✅ Billable
├── J04.1 Acute tracheitis ❌ Non-billable
│ │
│ ├── J04.10 Acute tracheitis without obstruction ✅ Billable
│ └── J04.11 Acute tracheitis with obstruction ✅ Billable
│
├── J04.2 Acute laryngotracheitis ✅ Billable
└── J04.3 Supraglottitis, unspecified ❌ Non-billable
  │
  ├── J04.30 Supraglottitis, unspecified, without obstruction ✅ Billable
  └── J04.31 Supraglottitis, unspecified, with obstruction ✅ Billable

Dual Coding for Pathogens

ICD-10-CM guidelines instruct coders to use an additional code (B95-B97) to identify the infectious agent if it is known and documented (e.g., Streptococcus, Staphylococcus), or to code first influenza (J09-J11) if present.

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✅ Includes

The following clinical terms and scenarios map to J04.0 when documented:

• Acute edematous laryngitis

• Acute subglottic laryngitis (without obstruction)

• Acute suppurative laryngitis

• Acute ulcerative laryngitis

• Laryngitis (acute) NOS (Not Otherwise Specified)

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❌ Excludes

Excludes 1 — Cannot Be Coded Simultaneously with J04.0

Code	Description	Note
J05.0	Acute obstructive laryngitis [croup]	Mutually exclusive. If the acute laryngitis involves airway obstruction, J05.0 accurately captures the elevated severity and clinical presentation.
J05.1-	Acute epiglottitis	Mutually exclusive due to distinct anatomical focus and differing severity profile (epiglottis vs. vocal cords/general larynx).

Excludes 1 Violation Risk

A common error occurs when coders attempt to code both J04.0 and J05.0 for a pediatric patient presenting with croup and a hoarse voice. Because croup is by definition obstructive laryngitis, only J05.0 should be reported.

Excludes 2 — May Be Coded in Addition if Separately Present

Code	Description	Note
J37.0	Chronic laryngitis	May be coded simultaneously if the patient has underlying chronic laryngitis experiencing a distinct acute exacerbation (though querying for clarification may be beneficial).
J38.5	Laryngismus (stridulus)	Can be coded together if a separate laryngeal spasm is documented alongside the acute laryngeal infection.

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📋 Clinical Overview

Phenotype Distinction: Laryngitis Classifications

This table compares the clinical differentiators that drive accurate diagnosis coding between closely related laryngeal conditions.

Feature	J04.0 — Acute Laryngitis	J37.0 — Chronic Laryngitis	J05.0 — Obstructive Laryngitis
Duration	< 3 weeks	> 3 weeks	Acute onset
Airway Status	Clear / Unobstructed	Clear / Unobstructed	Obstructed (Stridor present)
Common Etiologies	Viral URI, Vocal strain	Smoking, GERD/LPR, Allergies	Viral (Parainfluenza common in pediatric)

Documentation Tip — Symptom Duration

Vague documentation of “laryngitis” defaults to acute (J04.0). If the clinical context suggests a chronic issue (e.g., ENT follow-up for hoarseness lasting months), query the provider to document “chronic laryngitis” to accurately capture J37.0.

Manifestations & Symptom Burden

Common presenting symptoms that support the clinical validation of J04.0 include:

• Dysphonia / Hoarseness: Primary indicator due to vocal cord inflammation.

• Odynophagia: Throat pain or pain upon swallowing.

• Dry cough: Frequently accompanies the laryngeal irritation.

Coding Manifestations

If an underlying infectious organism or associated virus is explicitly diagnosed by the provider, code the organism as an additional diagnosis:

• B95.x — Streptococcus or Staphylococcus

• B97.89 — Other viral agents

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💰 HCC Risk Adjustment (CMS-HCC v28)

Field	Detail
CMS-HCC Model Version	v28 (2024-2025 Implementation)
HCC Assignment	❌ Not HCC-Mapped
HCC Category	N/A
RAF Coefficient	N/A

J04.0 does not map to an HCC under v28.

Capture Annually

As this is not an HCC-mapped chronic condition, there is no annual capture requirement for risk adjustment purposes. Code only when actively managed or treated during the current encounter.

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🏥 DRG Assignment

MDC 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat

DRG	Title	Est. Relative Weight*
DRG 152	Otitis Media and URI with MCC	~1.15
DRG 153	Otitis Media and URI without MCC	~0.65

Approximate. Verify against IPPS FY2026 Final Rule tables.

Sequencing and Complications

Acute laryngitis is rarely a principal inpatient diagnosis unless a patient is admitted for severe dehydration secondary to odynophagia or requires close airway monitoring that does not progress to obstruction. It does not count as a CC or MCC when sequenced as a secondary diagnosis.

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🔗 Related ICD-10-CM Codes

Associated Pathogens & Etiologies

Code	Description
J04.0	Acute laryngitis ← This Code
J10.1	Influenza due to other identified influenza virus with other respiratory manifestations
B97.89	Other viral agents as the cause of diseases classified elsewhere

Anatomic Site Variants

Code	Description
J02.9	Acute pharyngitis, unspecified
J03.90	Acute tonsillitis, unspecified
J04.10	Acute tracheitis without obstruction

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🛠️ Commonly Associated CPT Codes (Outpatient & Profee)

Outpatient and Profee Setting Context

Acute laryngitis is predominantly managed in the outpatient setting. CPT codes generally reflect E/M services or diagnostic endoscopic inspections of the larynx to rule out vocal cord nodules, polyps, or masses if hoarseness is severe.

CPT Code	Description	Profee Coding Notes (Modifier 26)
99213/99214	Office or other outpatient visit, established patient	Frequent primary service billed.
31575	Laryngoscopy, flexible; diagnostic	If performed with an E/M, append modifier -25 to the E/M if criteria are met.

NCCI Bundling Considerations

• 31575 (Flexible Laryngoscopy) billed on the same day as an E/M (e.g., 99213) requires Modifier -25 on the E/M code. The documentation must clearly show that the E/M service was significant and separately identifiable from the inherent evaluation required to decide to perform the scope.

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🔬 ICD-10-PCS Crosswalk (Inpatient Procedures)

When J04.0 is an inpatient diagnosis, these PCS codes are relevant for associated inpatient procedures, though procedural intervention is uncommon.

PCS Section	Body System	Root Operation	Clinical Application
0 (Medical/Surgical)	9 (Ear, Nose, Sinus)	J (Inspection)	Diagnostic laryngoscopy performed bedside or in an inpatient suite: 09JZ4ZZ (Percutaneous Endoscopic) or 09JZ7ZZ (Via Natural or Artificial Opening).

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💊 Coding Scenarios and Examples

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Scenario 1 — Outpatient Clinic: Uncomplicated Acute Laryngitis

Clinical Vignette: A 44-year-old female presents to her PCP complaining of a sore throat and lost voice for 3 days. She has a mild dry cough. No stridor or shortness of breath. Exam shows erythematous posterior pharynx and hoarse vocalization. Rapid Strep is negative. Diagnosed with acute viral laryngitis. Advised vocal rest and hydration.

CPT / HCPCS (Profee):

• 99213 — Office visit, established patient, low MDM.

ICD-10-CM Diagnoses:

• J04.0 — Acute laryngitis (Primary reason for the visit and supported by “lost voice” and diagnosis).

• B97.89 — Other viral agents as the cause of diseases classified elsewhere (To capture the viral etiology identified by the provider).

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Scenario 2 — Inpatient Admission: Secondary Diagnosis

Clinical Vignette: A 68-year-old male is admitted for acute exacerbation of COPD. During the admission, he complains of throat pain and hoarseness that started two days prior. ENT is consulted, performs a bedside flexible laryngoscopy, and diagnoses acute laryngitis without obstruction. The COPD exacerbation is treated with IV steroids and bronchodilators.

Principal Diagnosis:

• J44.1 — Chronic obstructive pulmonary disease with (acute) exacerbation (Reason for admission).

Secondary Diagnoses:

• J04.0 — Acute laryngitis (Treated/evaluated by ENT consult).

MS-DRG Assignment: Groups to DRG 192 (Chronic Obstructive Pulmonary Disease without CC/MCC). J04.0 is not a CC/MCC and does not elevate the DRG weight.

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Scenario 3 — CDI Query: Clarifying Obstruction vs. Uncomplicated

Clinical Vignette: A 4-year-old boy is brought to the ED with a barking cough, hoarse voice, and mild retractions. The ED provider’s final diagnosis simply states “Acute laryngitis. Treated with oral dexamethasone.”

Action / Outcome:

The documentation is vague because “barking cough” and “retractions” with dexamethasone treatment strongly indicate croup (obstructive laryngitis), but the provider only wrote “acute laryngitis.” Coding J04.0 here would miss the severity of the clinical picture. A clinical validation query is required.

Query Response: Provider updates documentation to confirm: “Acute obstructive laryngitis (croup).”

Corrected ICD-10-CM Coding:

• J05.0 — Acute obstructive laryngitis [croup] (Accurately replaces J04.0).

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⚠️ Coding Pitfalls and Tips

	Pitfall or Tip
❌	Defaulting to J04.0 for Pediatric “Barking Cough”. Croup is frequently documented loosely as laryngitis by some providers. If the record indicates stridor, barking cough, or airway compromise, query for J05.0 (obstructive laryngitis) instead of settling for J04.0.
❌	Using J04.0 for Prolonged Hoarseness. If the patient’s hoarseness has lasted longer than 3 weeks (e.g., heavy smokers or vocalists presenting to ENT), J04.0 is clinically inaccurate. The provider should be queried to confirm chronic laryngitis (J37.0).
✅	Always Code Associated Influenza. If the provider documents that the acute laryngitis is due to an active influenza infection, you must use the appropriate J09-J11 code combination as instructed by the “Code also” guideline.
✅	Identify the Organism. Whenever a specific bacterial or viral agent is identified by lab work and confirmed by the provider as the cause of the laryngitis, assign an additional code from categories B95-B97.

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📚 Sources

1. CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2026.

2. CMS. IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43. MDC 03 logic tables.

3. AMA. CPT Professional Edition 2026. Surgery / Respiratory System.