Q31.8 is the authoritative medical code for Code. This classification is used in medical billing and clinical recording to specify the clinical criteria for code (ICD-10-CM Q31.8), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Other congenital malformations of larynx is a billable ICD-10-CM diagnosis code Q31.8. Inclusion terms: 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. Excludes1 (not coded here): congenital laryngeal stridor NOS P28.89.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for Q31.8 in the official ICD-10-CM tabular list.
Inclusion Terms
Alternative terms the tabular list files under this code.
- 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
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- congenital laryngeal stridor NOS P28.89
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with Q31.8?
Per Excludes1 instructions, Q31.8 must not be reported with: congenital laryngeal stridor NOS (P28.89).
What conditions are included under Q31.8?
Code includes: Absence of larynx; Agenesis of larynx; Atresia of larynx; Congenital cleft thyroid cartilage; Congenital fissure of epiglottis.
Codes in This Family (7)
Official ICD-10-CM classifications in the same code family as Q31.8, with their registry titles.
- Q31 — Congenital malformations of larynx
- Q31.0 — Web of larynx
- Q31.1 — Congenital subglottic stenosis
- Q31.2 — Laryngeal hypoplasia
- Q31.3 — Laryngocele
- Q31.5 — Congenital laryngomalacia
- Q31.9 — Congenital malformation of larynx, unspecified
Indexed Clinical Terms (49)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- 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
Related Codes & Numerical Sequence (Crawl Map)
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