supraglottitis

DEFINITION of supraglottitis

supraglottitis is an acute inflammatory condition affecting the supraglottic region of the larynx, involving the epiglottis, aryepiglottic folds, arytenoids, and false vocal cords, with the potential to cause life-threatening upper airway obstruction. Unlike epiglottitis, which is limited specifically to the epiglottis, supraglottitis involves the broader supraglottic larynx, though the two terms are often used interchangeably in clinical practice. The condition is typically caused by bacterial infection — most commonly Haemophilus influenzae, Streptococcus pneumoniae, or group A streptococci — triggering a rapid inflammatory response with edema that can critically narrow the airway. It may present as infectious or, less commonly, as a result of thermal or chemical inhalation injury. Clinically relevant coding subtypes include supraglottitis without obstruction (J04.30) and supraglottitis with obstruction (J04.31), where the presence or absence of airway compromise is the key differentiating factor. It is commonly confused with croup (acute obstructive laryngitis), but supraglottitis typically affects adults and older children, involves the supraglottic structures rather than the subglottic airway, and is not associated with the classic “barking cough” of croup.

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ETYMOLOGY of supraglottitis

latin | greek

Component	Origin	Meaning
supra-	Latin supra (SOO-prah)	“above,” “over,” “beyond” — directional/positional prefix indicating location above a structure
glott-	Greek glōtta / glōssa (GLOT-tah), from glōkhis (tip, point)	“tongue,” “mouth of the windpipe,” “glottis” — referring to the vocal apparatus of the larynx
-itis	Greek -itis (EYE-tis)	Noun-forming suffix — “inflammation of” — indicating acute inflammatory process of a named structure

The term entered English medical usage in the early 1900s as supraglottitis (noun), formed from Latin supra- (“above”) + Greek glōtta (“tongue/glottis”) + Greek -itis (“inflammation”) — literally “inflammation above the glottis.” The root glott- (“vocal aperture”) connects supraglottitis to the broader -glott- ROOT FAMILY: -glottis (the vocal apparatus itself), epiglottitis (epi- “upon” + glottis + -itis → inflammation upon the glottis), and subglottic stenosis (sub- “below” + glottic → narrowing below the vocal cords). The positional prefix supra- is highly productive in anatomical medical terminology, appearing in supraorbital (above the orbit), supraspinatus (above the spine of the scapula), suprarenal (above the kidney/adrenal), and supraclavicular (above the clavicle).

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🔀 ALIASES / ALTERNATE TERMS

• Supraglottic (adjective form — used in clinical collocations: “supraglottic edema,” “supraglottic laryngitis,” “supraglottic airway”)
• Epiglottitis (lay and clinical synonym; terms are often used interchangeably, though epiglottitis is technically a subset — coded separately under J05.10 / J05.11)
• Supraglottic laryngitis (clinical synonym used in documentation; maps to J04.30-J04.31 depending on obstruction status)
• Acute supraglottitis (the most common clinical descriptor; emphasis on acute onset and rapid progression)
• Supraglottic inflammation (broader clinical descriptor encompassing infectious and non-infectious etiologies)
• Supraglottitis without obstruction (billable code for uncomplicated supraglottitis; airway is patent — J04.30)
• Supraglottitis with obstruction (billable code for supraglottitis complicated by airway obstruction — J04.31; requires urgent airway management)
• Infectious supraglottitis (bacterial etiology — most common cause; H. influenzae, group A strep, S. pneumoniae)
• Non-infectious supraglottitis (caused by thermal/chemical inhalation, caustic ingestion, or foreign body; coded to J04.30 or J04.31 with additional external cause code)

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🔗 RELATED TERMS

• epiglottitis — overlapping clinical entity; the term is limited to the epiglottis alone, whereas supraglottitis involves broader structures including the arytenoids and aryepiglottic folds; coded under J05.10 (without obstruction) and J05.11 (with obstruction)
• croup — acute obstructive laryngitis affecting the subglottic airway (below the vocal cords); clinically distinguished by younger age of onset, barking cough, and inspiratory stridor; Excludes1 from J04.3 per ICD-10-CM tabular instructions
• laryngitis — inflammation of the larynx broadly; supraglottitis is a more anatomically specific and clinically severe form (J04.0)
• laryngotracheitis — inflammation extending from the larynx into the trachea; may accompany supraglottitis in severe cases
• airway obstruction — the critical complication of supraglottitis; distinguishes J04.31 (with obstruction) from J04.30 (without obstruction)
• edema — the primary physiological mechanism driving airway compromise in supraglottitis; inflammatory mediators cause rapid mucosal swelling of supraglottic tissues
• dysphagia — difficulty swallowing; hallmark symptom of supraglottitis due to involvement of aryepiglottic folds and epiglottis
• stridor — high-pitched inspiratory sound caused by partial upper airway obstruction; a red-flag symptom indicating impending airway compromise in supraglottitis
• tracheostomy — emergency surgical airway procedure; may be required in supraglottitis with severe obstruction not amenable to intubation
• nasopharyngoscopy — flexible diagnostic scope procedure used to directly visualize supraglottic edema and confirm diagnosis; key diagnostic tool in stable patients (CPT 31575)

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CODING CORNER

🏥 ICD-10-CM CODES

Supraglottitis (J04.3x — Obstruction Status Required)

Code	Description
J04.3-	Supraglottitis, unspecified — parent code, NOT billable; obstruction status required
J04.30	Supraglottitis, unspecified, without obstruction
J04.31	Supraglottitis, unspecified, with obstruction

Related Supraglottic / Epiglottic Conditions

Code	Description
J05.10	Acute epiglottitis without obstruction
J05.11	Acute epiglottitis with obstruction
J04.0	Acute laryngitis
J04.10	Acute tracheitis without obstruction
J04.11	Acute tracheitis with obstruction
J04.20	Acute laryngotracheitis
J38.5	Laryngismus (stridulus) — Excludes2 from J04.3
C32.1	Malignant neoplasm of supraglottis — used as principal/secondary dx when supraglottic obstruction is neoplastic in origin

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🔧 COMMON CPT CODES (Supraglottitis-Related Diagnosis & Treatment)

CPT Code	Description
31575	Laryngoscopy, flexible, diagnostic — primary diagnostic procedure for supraglottitis in the stable patient
31526	Laryngoscopy, direct, with operating microscope or telescope — diagnostic with enhanced visualization
31500	Intubation, endotracheal, emergency procedure — used in supraglottitis with impending or active airway obstruction
31600	Tracheostomy, planned (separate procedure) — surgical airway when intubation is not possible
31601	Tracheostomy, younger than 2 years — pediatric airway emergency
31420	Epiglottidectomy — surgical removal of the epiglottis; rare, reserved for recurrent supraglottitis/epiglottitis
31561	Laryngoscopy, direct, operative, with arytenoidectomy — when arytenoid involvement requires surgical intervention
70360	Radiologic examination, neck, soft tissue — AP/lateral neck X-ray to evaluate for “thumb sign” or soft tissue swelling
70486	CT, maxillofacial area, without contrast — CT neck for abscess evaluation in stable patients
70487	CT, maxillofacial area, with contrast — preferred CT neck with contrast for epiglottic abscess workup

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⚠️ Coding Note: The J04.3x code category requires obstruction status — never leave J04.3 as the final code on an inpatient or outpatient profee claim, as it is a non-billable parent code. The single most critical documentation trigger is whether airway obstruction is present: J04.30 (without) vs. J04.31 (with) — if the provider documents “stridor,” “impending airway compromise,” or “required intubation/tracheostomy,” a query should be generated to confirm obstruction status for J04.31. For sequencing on inpatient profee claims, supraglottitis is coded as the principal diagnosis when it is the condition chiefly responsible for admission; if the patient required intubation or tracheostomy, ensure the procedure is coded and the CC/MCC impact on the DRG is captured. Do not confuse J04.3x (supraglottitis) with J05.1x (acute epiglottitis) — if the provider specifically documents “epiglottitis” in the final diagnosis, use J05.10 or J05.11; if documentation uses “supraglottitis” or describes broader supraglottic involvement, J04.30/J04.31 is correct. Watch for undercoding when providers document only “laryngitis” (J04.0) when the clinical picture — fever, dysphagia, drooling, odynophagia, and endoscopic confirmation of supraglottic edema — clearly supports supraglottitis; a physician query is warranted. For inpatient profee, the addition of obstruction (J04.31) or respiratory failure as a secondary diagnosis can significantly impact DRG assignment and reimbursement.

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DERIVATIONS of supraglottitis

TABLE definition AS Definition
FROM #medterm 
WHERE length(filter(roots, (word) => econtains([[supraglottitis]].roots, word))) > 0 AND file.name != [[supraglottitis]].file.name
SORT file.name ASC

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Query functionality

TABLE definition AS Definition
FROM #medterm 
WHERE length(filter(definition, (word) => econtains([[supraglottitis]].definition, word))) > 0 AND file.name != [[supraglottitis]].file.name

Med roots dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms