ICD-10 Code J34.821 – External nasal valve collapse (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J34.821 – External nasal valve collapse
What it is
External nasal valve collapse is narrowing or weakening of the outer part of the nasal airway, usually causing impaired airflow through the nostril area. It can be structural, dynamic, or both.
Clinical signs
Common findings include nasal obstruction, visible inward collapse of the nostril during inspiration, and improvement with manual lateral cheek support. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents external nasal valve collapse as the cause of nasal airway obstruction or breathing difficulty. It is also appropriate when the note describes collapse of the external valve on exam, imaging, or during functional assessment. Check documentation if the record only mentions general nasal congestion.
Do not use for
Do not use this code for septal deviation, allergic rhinitis, or unspecified nasal obstruction unless external nasal valve collapse is clearly documented. Do not assume the diagnosis from symptoms alone.
Coding tip
Code the documented anatomic site precisely, and confirm whether the collapse is external rather than internal before assigning J34.821.