Supraglottis is the uppermost of the three anatomical compartments of the larynx, bounded inferiorly by the laryngeal ventricles (the lateral recesses between the true and false vocal cords) and superiorly by the tip of the epiglottis and the superior margin of the aryepiglottic folds, where it communicates with the hypopharynx. It is anatomically and oncologically distinct from the glottis (the true vocal cord level) and the subglottis (the infraglottic compartment), with the supraglottis being notable for its rich bilateral lymphatic drainage — carrying up to a 60% risk of occult cervical lymph node metastasis at the time of supraglottic carcinoma diagnosis, which drives bilateral neck treatment decisions. The key structural components include: the epiglottis (suprahyoid and infrahyoid portions), the aryepiglottic folds, the arytenoid cartilages, the false vocal cords (vestibular folds), and the laryngeal ventricles; collectively, these structures close the laryngeal inlet during swallowing via the laryngeal adductor reflex, preventing aspiration. Pathologically, the supraglottis is the subsite of origin for approximately 30-35% of all laryngeal carcinomas, almost exclusively squamous cell carcinoma (SCC), coded to C32.1; inflammatory conditions include acute supraglottitis (J04.30 / J04.31) and acute epiglottitis (J05.10 / J05.11), both of which can cause life-threatening airway obstruction. The supraglottis is most commonly confused with the epiglottis specifically — the epiglottis is a single component within the supraglottis, not synonymous with it; additionally, “supraglottitis” is the preferred modern term over “epiglottitis” when the entire supraglottic region is inflamed, a distinction that now carries separate ICD-10-CM codes.
Noun-forming suffix — indicating “anatomical structure” or “part”
The term entered English in the late 1800s as supraglottis (noun), from New Latin supraglottis, composed of Latin supra- (“above”) and Greek glōttis (“mouth of the windpipe / vocal apparatus”) — literally “that which is above the glottis.” The root glōtt- connects Supraglottis to the entire -glott- root family: glottis (glōtt- + -is → the vocal apparatus itself), subglottis (sub- + glottis → below the glottis), and epiglottis (epi- + glottis → upon the glottis). The positional prefix supra- is highly productive in anatomical and medical terminology, appearing in supraclavicular, suprapubic, supraspinatus, suprarenal, and supraventricular.
🔀 ALIASES / ALTERNATE TERMS
Supraglottic(adjective form — used clinically in “supraglottic carcinoma,” “supraglottic laryngectomy,” “supraglottic swallow,” and “supraglottic airway”)
Supraglottic larynx(full anatomical descriptor used in radiology, operative, and oncology reports; synonymous with supraglottis)
Epiglottis(the most prominent structural component of the supraglottis — the cartilaginous flap that closes the laryngeal inlet during swallowing; NOT synonymous with supraglottis, which is the entire compartment)
supraglottitis(acute inflammatory condition of the entire supraglottic region; modern preferred term when inflammation extends beyond just the epiglottis; J04.30 without obstruction, J04.31 with obstruction)
Acute epiglottitis(acute inflammation primarily of the epiglottis; classically caused by H. influenzae type b; J05.10 without obstruction, J05.11 with obstruction — distinct from supraglottitis codes)
Supraglottic carcinoma(squamous cell carcinoma arising within the supraglottic compartment; notable for early bilateral cervical metastasis; C32.1)
Laryngomalacia(the most common cause of stridor in infants; involves supraglottic structures — most often the epiglottis and aryepiglottic folds — collapsing into the airway on inspiration; Q31.5)
Aryepiglottic fold carcinoma(SCC arising from the aryepiglottic fold, which is part of the supraglottis; included under C32.1 — also coded here is the hypopharyngeal aspect coded separately to C13.1)
False vocal cords(the vestibular folds — paired mucosal folds within the supraglottis just above the true vocal cords; not used for phonation; serve airway protection; also called ventricular folds)
Laryngeal ventricle(the lateral recess or saccule between the true and false vocal cords; marks the inferior boundary of the supraglottis; mucocele or saccular cyst of this space coded to J38.7)
🔗 RELATED TERMS
glottis — the middle laryngeal compartment; comprises the true vocal cords and the rima glottidis; immediately inferior to the supraglottis; malignancy here coded to C32.0
Subglottis — the lowermost laryngeal compartment below the true vocal cords extending to the inferior cricoid border; malignancy coded to C32.2; see Subglottis note
Epiglottis — the leaf-shaped cartilaginous structure that is the most superior and anterior component of the supraglottis; it deflects food into the esophagus during swallowing; inflammation coded to J05.10 or J05.11
Laryngomalacia — the most common congenital supraglottic pathology; abnormal collapse of supraglottic structures (omega-shaped epiglottis, short aryepiglottic folds) into the airway; coded to Q31.5; treated surgically with supraglottoplasty
Hypopharynx — the structure immediately superior and posterior to the supraglottis where the digestive and respiratory tracts diverge; tumors at the aryepiglottic fold can span both structures requiring careful site documentation; hypopharyngeal carcinoma coded to C13.x
Laryngeal adductor reflex — the protective neuromuscular reflex that closes the supraglottic inlet during swallowing; disruption causes aspiration; relevant to dysphagia coding (R13.10-R13.19) and swallowing study CPT codes
Aspiration — the entry of food, liquid, or secretions into the airway below the supraglottis; a major functional consequence of supraglottic dysfunction; coded to J69.0 (pneumonitis due to food/vomit) or T17.x (foreign body in airway)
Laryngectomy — surgical resection of the larynx; supraglottic laryngectomy specifically removes the supraglottic compartment while preserving the true vocal cords and voice; coded to CPT 31367 or 31368
Dysphonia — voice impairment; while primarily a glottic symptom, supraglottic lesions (especially large epiglottic tumors) can alter resonance and voice quality; coded to R49.0
Dysphagia — difficulty swallowing; a cardinal symptom of supraglottic pathology given the supraglottis’ role in airway protection during swallowing; coded to R13.10-R13.19 by type
laryngoscopy — the primary endoscopic tool for supraglottic evaluation; flexible and direct rigid variants coded across CPT 31520-31579 range
Laryngoscopy, direct, operative, with biopsy; with operating microscope or telescope — preferred for supraglottic tumor biopsy requiring enhanced visualization
31540
Laryngoscopy, direct, operative, with excision of tumor and/or stripping of vocal cords or epiglottis
31541
Laryngoscopy, direct, operative, with excision of tumor and/or stripping of vocal cords or epiglottis; with operating microscope or telescope — also used for supraglottoplasty when no specific code applies (see coding note)
Laryngoscopy, direct, operative, with arytenoidectomy — resection of the arytenoid cartilage (supraglottic component)
31561
Laryngoscopy, direct, operative, with arytenoidectomy; with operating microscope or telescope
31367
Laryngectomy; subtotal supraglottic, without radical neck dissection — open surgical resection of the supraglottis preserving the true cords
31368
Laryngectomy; subtotal supraglottic, with radical neck dissection — used when cervical lymph node dissection is performed concurrently for nodal disease
⚠️ Coding Note: The most critical coding distinction in the supraglottis is between supraglottitis (J04.30/J04.31) and acute epiglottitis (J05.10/J05.11) — these are separate code categories and the provider’s documentation language drives the assignment; “epiglottitis” maps to J05.1x while “supraglottitis” maps to J04.3x — if the terms are used interchangeably in the record, query the provider, as obstruction status must also be specified for both. For supraglottic carcinoma, C32.1 is the only billable site-specific code — the parent C32.- is non-billable; if documentation states “laryngeal cancer” without subsite specification, query before defaulting to C32.9, as subsite drives staging, treatment approach, and potential HCC weight.
On inpatient profee claims, watch for documentation triggers such as “stridor,” “muffled voice,” “hot-potato voice,” “drooling,” or “inability to swallow” in the setting of fever — these are classic supraglottitis/epiglottitis presentations that are frequently coded only as “upper respiratory infection” or “pharyngitis,” representing significant undercoding; a provider query should be placed to clarify whether acute supraglottitis or epiglottitis should be documented. For CPT coding of supraglottoplasty (surgical treatment of laryngomalacia), note that no specific CPT code exists — per AAPC and AAO-HNS guidance, 31541 (direct laryngoscopy with excision of tumor/stripping of epiglottis, with microscope) or 31588 (unlisted larynx procedure) are the most commonly applied codes, and payer policy should be verified before claim submission.
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