| Description | Rating |
|---|---|
| 6520 Larynx, stenosis of, including residuals of laryngeal trauma (unilateral or bilateral): | |
| FEV-1 less than 40% predicted with Flow-Volume Loop compatible with upper airway obstruction, or permanent tracheostomy | 100 |
| FEV-1 of 40-55% predicted with Flow-Volume Loop compatible with upper airway obstruction | 60 |
| FEV-1 of 56-70% predicted with Flow-Volume Loop compatible with upper airway obstruction | 30 |
| FEV-1 of 71-80% predicted with Flow-Volume Loop compatible with upper airway obstruction | 10 |
Note: Or evaluate as aphonia (DC 6519).