Interstitial lung diseases are conditions that affect the tissues surrounding the air sacs in the lungs. All are rated on the following rating system (except Sarcoidosis):
| Test | Result/Condition | Rating |
|---|---|---|
| FVC | Less than 50% | 100% |
| FVC | 50-64% | 60% |
| FVC | 65-74% | 30% |
| FVC | 75-80% | 10% |
| DLCO (SB) | Less than 40% | 100% |
| DLCO (SB) | 40-55% | 60% |
| DLCO (SB) | 56-65% | 30% |
| DLCO (SB) | 66-80% | 10% |
| Exercise Test | Less than 15 ml/kg/min with the limitation caused by a | |
| heart or respiratory condition | 100% | |
| Exercise Test | 15-20 ml/kg/min with the limitation caused by a heart or | |
| respiratory condition | 60% | |
| Heart Conditions | Cor Pulmonale (right heart failure) | 100% |
| Heart Conditions | Pulmonary hypertension (high blood pressure between the | |
| lungs and the heart) | 100% | |
| Other | Requires oxygen therapy outside a medical facility | 100% |