Q31.8 Other congenital malformations of larynx

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Absence of larynx
• Agenesis of larynx
• Atresia of larynx
• Congenital cleft thyroid cartilage
• Congenital fissure of epiglottis
• Congenital stenosis of larynx NEC
• Posterior cleft of cricoid cartilage

Applies from Q31 Congenital malformations of larynx

Excludes1 (never code together)

• congenital laryngeal stridor NOS (P28.89)

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 748.3 Other anomalies of larynx, trachea, and bronchus (approximate)

Code annotations containing back-references to Q31.8

Back-references to Q31

• Code Also: P28 Other respiratory conditions originating in the perinatal period (", if applicable, congenital malformations of the respiratory system (Q30-Q34)")

Diagnosis Index entries for Q31.8

• Absence (of) (organ or part) (complete or partial) › cricoid cartilage, congenital
• Absence (of) (organ or part) (complete or partial) › epiglottis, congenital
• Absence (of) (organ or part) (complete or partial) › glottis, congenital
• Absence (of) (organ or part) (complete or partial) › larynx (congenital)
• Absence (of) (organ or part) (complete or partial) › thyroid (gland) (acquired) › cartilage, congenital
• Accessory (congenital) › vocal cords
• Agenesis › cricoid cartilage
• Agenesis › epiglottis
• Agenesis › glottis
• Agenesis › larynx
• Agenesis › thyroid (gland) › cartilage
• Anomaly, anomalous (congenital) (unspecified type) › aryteno-epiglottic folds
• Anomaly, anomalous (congenital) (unspecified type) › cricoid cartilage
• Anomaly, anomalous (congenital) (unspecified type) › epiglottis
• Anomaly, anomalous (congenital) (unspecified type) › glottis
• Anomaly, anomalous (congenital) (unspecified type) › thyroid (gland) › cartilage
• Anomaly, anomalous (congenital) (unspecified type) › union › cricoid cartilage and thyroid cartilage
• Anomaly, anomalous (congenital) (unspecified type) › union › thyroid cartilage and hyoid bone
• Anomaly, anomalous (congenital) (unspecified type) › union › trachea with larynx
• Anomaly, anomalous (congenital) (unspecified type) › valleculae
• Atresia, atretic › cricoid cartilage
• Atresia, atretic › epiglottis
• Atresia, atretic › glottis
• Atresia, atretic › larynx
• Atresia, atretic › thyroid cartilage
• Cleft (congenital) › cricoid cartilage, posterior
• Cleft (congenital) › thyroid cartilage
• Constriction › larynx › congenital
• Constriction › larynx › congenital › specified NEC
• Cyst (colloid) (mucous) (simple) (retention) › congenital NEC › epiglottis
• Cyst (colloid) (mucous) (simple) (retention) › congenital NEC › larynx
• Deformity › cricoid cartilage (congenital)
• Deformity › epiglottis (congenital)
• Deformity › larynx (muscle) (congenital)
• Deformity › thyroid (gland) (congenital) › cartilage
• Elongated, elongation (congenital) › petiolus (epiglottidis)
• Fissure, fissured › epiglottis (congenital)
• Fissure, fissured › larynx › congenital
• Imperfect › closure (congenital) › cricoid cartilage
• Imperfect › closure (congenital) › glottis
• Imperfect › closure (congenital) › larynx
• Laryngofissure › congenital
• Malposition › congenital › epiglottis
• Malposition › congenital › glottis
• Malposition › congenital › larynx
• Malposition › congenital › thyroid (gland) (tissue) › cartilage
• Obstruction, obstructed, obstructive › larynx NEC › congenital
• Stenosis, stenotic (cicatricial) › larynx › congenital NEC
• Stricture › larynx › congenital NEC

Nearby codes

• Q31.0 Web of larynx
• Q31.1 Congenital subglottic stenosis
• Q31.2 Laryngeal hypoplasia
• Q31.3 Laryngocele
• Q31.5 Congenital laryngomalacia
• Q31.8 Other congenital malformations of larynx (this code)
• Q31.9 Congenital malformation of larynx, unspecified