External nasal valve collapse, dynamic

This code describes a condition where the outer part of the nostril (nasal ala) collapses inward during inspiration, leading to nasal airway obstruction. This collapse is dynamic, meaning it occurs or worsens with breathing efforts, rather than being a fixed anatomical deformity. It impairs airflow and can cause symptoms like difficulty breathing through the nose.

Use this code when documentation clearly indicates dynamic collapse of the external nasal valve, often observed during physical examination (e.g., Cottle maneuver, modified Cottle maneuver, or direct visualization during inspiration). This diagnosis is typically made by an otolaryngologist or other specialist evaluating nasal obstruction.

• Ensure the documentation specifies "dynamic" collapse to differentiate from fixed anatomical issues.
• Do not confuse with internal nasal valve collapse, which is a different anatomical area and coded separately.
• Look for physician notes describing inspiratory collapse of the alar sidewall or nostril.