MD11.8 Mouth breathing

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01

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 [obstructive sleep apnoea] 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.

exclusions

• Dry mouth  (DA02.1)

sections/codes in this section ()

• Stertor  (MD11.80)
• Other specified mouth breathing  (MD11.8Y)
• Mouth breathing, unspecified  (MD11.8Z)

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