ICD-11 classes
21 Symptoms, signs or clinical findings, not elsewhere...
Symptoms, signs or clinical findings of the respiratory...
Symptoms or signs involving the respiratory system
MD11 — Abnormalities of breathing
MD11.8 — Mouth breathing

ICD-11 MD11.8 — Mouth breathing

Breathing through mouth. Nasal obstruction may also necessitate mouth breathing, which itself can precipitate obstructive apnoea. Breathing through the mouth may also increase risk for OSA by its effect on the tongue. The tongue forms the anterior wall of the oropharynx; both the supine posture and opening of the mouth tend to displace it posteriorly and encourage airway closure.

The diagnosis includes nothing.

Diagnosis with code MD11.8 contains 3 clarifying diagnoses:

1. MD11.80 — Stertor
2. MD11.8Y — Other specified mouth breathing
3. MD11.8Z — Mouth breathing, unspecified

The diagnosis is coded elsewhere:

• Abnormalities of breathing #13100
• Mouth breathing #13117