Epiglottitis is an acute or chronic inflammatory condition of the epiglottis — the leaf-shaped cartilaginous flap at the base of the tongue that guards the laryngeal inlet during swallowing — characterized by rapid edema and erythema that can critically narrow or completely occlude the upper airway. It is distinct from croup (J05.0), which involves subglottic narrowing below the vocal cords and presents with a characteristic barking cough, whereas epiglottitis produces a “hot-potato” muffled voice, severe odynophagia, drooling, and inspiratory stridor as supraglottic swelling progresses. The underlying mechanism is almost always infectious: historically dominated by Haemophilus influenzae type b (Hib), though widespread Hib vaccination has shifted the etiology in adults to Streptococcus species, Staphylococcus aureus, and other organisms; noninfectious causes (thermal injury, caustic ingestion, foreign body) also exist but are uncommon. Epiglottitis is exclusively pathological — there is no physiological form — and carries a mortality rate of 6-7% in adults, primarily from delayed recognition or sudden complete airway obstruction. ICD-10-CM classifies acute epiglottitis under J05.10 (without obstruction) and J05.11 (with obstruction), with a “Use Additional Code” instruction to identify the infectious organism (e.g., B96.3 for H. influenzae); chronic epiglottitis is classified under J37.0. It is commonly confused with peritonsillar abscess and retropharyngeal abscess, but the hallmark thumbprint sign on lateral neck X-ray — representing an enlarged, rounded epiglottis — is pathognomonic and definitively distinguishes it from those conditions.
Noun-forming suffix — “inflammation of” — the standard medical suffix denoting inflammatory disease of a named structure
The term entered English in the 1830s as epiglottitis (noun), formed directly from New Latin epiglottis, from Greek ἐπιγλωττίς (epiglōttis) — literally “upon the tongue-piece” — combined with the Greek inflammatory suffix -itis. The root glōtta (“tongue”) connects epiglottitis to the entire -gloss- / -glott- root family: epiglottis (the cartilage itself — “upon the glottis”), glossitis (inflammation of the tongue), and glossopharyngeal (pertaining to tongue and pharynx). The prefix epi- appears widely across medical terminology: epidermis (upon the skin), epidural (upon the dura), epididymis (upon the testis), epicardium (upon the heart), and epilepsy (a seizure that comes “upon” one). The suffix -itis is arguably the most productive inflammatory suffix in all of medicine, appearing in hundreds of terms including laryngitis, pharyngitis, tracheitis, and tonsillitis — each denoting inflammation at its respective anatomic site.
🔀 ALIASES / ALTERNATE TERMS
Epiglottic(adjective form — used in clinical collocations such as “epiglottic edema,” “epiglottic abscess,” and “epiglottic cyst”; adjective form used in operative and radiology reports)
Supraglottitis(preferred clinical synonym in adult otolaryngology, acknowledging that inflammation frequently extends beyond the epiglottis to the aryepiglottic folds, arytenoids, and surrounding supraglottic structures; coded identically to epiglottitis under J05.10/J05.11)
Acute supraglottitis(OTO operative and emergency medicine terminology; implies involvement of the full supraglottic larynx; some literature uses this term exclusively for adult presentations)
Hib epiglottitis(historical etiologic subtype caused by Haemophilus influenzae type b; now rare in vaccinated populations; code J05.10 or J05.11 + B96.3 for H. influenzae)
Epiglottic abscess(suppurative complication of epiglottitis in which pus collects within the epiglottis; increases urgency of airway intervention; code J05.11 when obstruction is documented)
Chronic epiglottitis(prolonged or recurrent inflammation of the epiglottis lasting more than a few weeks; NOT coded under J05.1x — classified under J37.0, Chronic laryngitis, which includes chronic epiglottitis as an Applicable To note)
Thermal epiglottitis(noninfectious form caused by hot liquid or steam inhalation; etiology-specific documentation should prompt query; coded J05.10/J05.11 with external cause code for thermal injury)
Epiglottitis with obstruction(clinical designation indicating documented or imminent airway compromise; the critical distinction driving code selection between J05.10 and J05.11 — also the key DRG and severity driver)
Epiglottitis without obstruction(acute presentation without documented airway compromise; coded J05.10; still a clinical emergency warranting close observation for progression to obstruction)
🔗 RELATED TERMS
Croup — subglottic laryngotracheobronchitis (J05.0), typically viral (parainfluenza), presenting in young children with a barking cough and inspiratory stridor; distinguished from epiglottitis by subglottic (not supraglottic) location, slower onset, and the absence of drooling or toxic appearance
Laryngitis — inflammation of the larynx more broadly (J04.0); usually viral and self-limiting; lacks the rapid airway-threatening progression characteristic of epiglottitis
Peritonsillar abscess — collection of pus adjacent to the tonsil (J36); presents with trismus, uvular deviation, and muffled voice but does not typically produce the thumbprint sign on lateral neck X-ray
Retropharyngeal abscess — deep space neck infection (J39.0) in the retropharyngeal space; most common in children; can also present with stridor and odynophagia but is distinguished by CT imaging showing posterior pharyngeal fluid collection
Angioedema — noninfectious rapid supraglottic or glottic swelling (T78.3x) due to allergic or hereditary mechanisms; distinguished from epiglottitis by absence of fever and infectious prodrome; coded differently but can mimic presentation
Stridor — the high-pitched inspiratory sound produced by partial upper airway obstruction; a hallmark symptom of epiglottitis with obstruction; coded R06.1 when documented as a clinical finding requiring separate management
Dysphagia — difficulty swallowing (R13.1x); one of the earliest and most consistent symptoms of epiglottitis due to epiglottic edema; code additionally when documented and managed
Odynophagia — painful swallowing; coded R13.10 or R13.19; distinguishes epiglottitis from purely obstructive airway conditions
Thumbprint sign — the pathognomonic radiographic finding on lateral neck X-ray showing an enlarged, rounded, thumb-shaped epiglottis; primary diagnostic sign; confirmed by direct or flexible laryngoscopy
Haemophilus influenzae type b (Hib) — the historically dominant causative organism; now largely eliminated in children by universal Hib vaccination; coded B96.3 as an additional code when confirmed as the causative agent
Flexible laryngoscopy — primary diagnostic and monitoring procedure in cooperative adult patients; performed with caution in children with suspected epiglottitis due to risk of precipitating complete obstruction; coded 31575
Tracheostomy — definitive surgical airway when endotracheal intubation fails or is anticipated to be impossible; coded 31600 (planned) or 31603 (emergency transtracheal)
CODING CORNER
🏥 ICD-10-CM CODES
Acute Epiglottitis (J05.1x — Obstruction Status Required)
Code
Description
J05.10
Acute epiglottitis without obstruction — use when documentation confirms epiglottitis but no airway obstruction is noted or documented
J05.11
Acute epiglottitis with obstruction — use when documentation confirms stridor, respiratory distress, or any degree of airway compromise due to epiglottic edema; the severity/CC driver
Chronic Epiglottitis (Classified under Chronic Laryngitis)
Code
Description
J37.0
Chronic laryngitis — Applicable To note includes “chronic epiglottitis”; use for prolonged or recurrent epiglottic inflammation beyond the acute phase
Companion / Causal Codes (Code Additionally When Documented)
Code
Description
B96.3
Haemophilus influenzae as the cause of diseases classified elsewhere — code additionally per J05.1x “Use Additional Code” instruction when Hib is confirmed causative organism
Methicillin resistant Staphylococcus aureus (MRSA) as the cause of diseases classified elsewhere — code additionally for MRSA epiglottitis; also an MCC
R06.1
Stridor — code additionally when separately documented and managed as a clinical finding
Laryngoscopy, flexible fiberoptic; diagnostic — primary diagnostic and monitoring procedure in adults with suspected epiglottitis; caution in children (can precipitate obstruction in the uncontrolled setting)
31505
Laryngoscopy, indirect; diagnostic — mirror-based laryngoscopy; occasionally used in the ED or outpatient setting for initial visualization of the supraglottis
Laryngoscopy, direct, with or without tracheoscopy; diagnostic, with operating microscope or telescope — direct visualization under anesthesia when flexible scope is contraindicated or fails
Intubation, endotracheal, emergency procedure — the most critical airway management code in epiglottitis with obstruction; used when swelling permits passage of an endotracheal tube; report separately from laryngoscopy
Tracheostomy, planned (separate procedure) — definitive surgical airway in cases where endotracheal intubation is not feasible or is anticipated to be unsustainable
Tracheostomy, emergency procedure; transtracheal — emergent surgical airway access when endotracheal intubation fails and patient is in acute airway distress
31605
Tracheostomy, emergency procedure; cricothyroid membrane — cricothyrotomy; last-resort emergency airway when all other methods fail; highest-risk approach
Tracheostomy, planned (separate procedure); younger than 2 years — pediatric tracheostomy code; use instead of 31600 for patients under age 2
70360
Radiologic examination, neck; soft tissue — lateral neck X-ray (plain film); the initial imaging study demonstrating the thumbprint sign; first-line diagnostic imaging in suspected epiglottitis
70486
Computed tomography, maxillofacial area; without contrast — CT neck/face without contrast; used to evaluate extent of supraglottic edema, abscess formation, and deep space spread when epiglottitis is complex or diagnosis is uncertain
Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes — applicable when the physician provides critical care services to a patient with acute epiglottitis with obstruction requiring continuous airway monitoring and management
⚠️ Coding Note: The single most important code selection decision in epiglottitis is obstruction status: J05.10 (without obstruction) vs. J05.11 (with obstruction) — these are not interchangeable and have significantly different severity implications; documentation triggering J05.11 includes any reference to stridor, respiratory distress, decreased oxygen saturation, difficulty breathing, or the need for emergent airway management, and a query is warranted when the clinical picture suggests obstruction but the physician’s diagnosis statement does not explicitly address it. Per ICD-10-CM Official Guidelines, J05.1x carries a mandatory “Use Additional Code (B95-B97) to identify the infectious agent” instruction — failure to capture the organism code when culture or clinical confirmation is present is an undercoding error that affects both completeness and CDI quality metrics; the most commonly missed organism code is B96.3 (H. influenzae), especially in older adult patients where Hib remains a possible etiology. Chronic epiglottitis is a frequent alias trap — do not code J05.10 or J05.11 for chronic presentations; the correct code is J37.0 (Chronic laryngitis), which explicitly includes chronic epiglottitis in its Applicable To note. For inpatient OTO claims, epiglottitis groups to MS-DRG 011/012/013 (Tracheostomy for face, mouth, and neck diagnoses or laryngectomy with MCC/CC/without CC-MCC) when tracheostomy is the principal procedure, or to MDC 04 respiratory DRGs when airway management is the primary basis for admission without a qualifying surgical procedure; J05.11 itself is classified as a CC, making obstruction documentation the key to DRG optimization in cases that do not trigger tracheostomy DRGs.
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