Pulmonary Fibrosis & Interstitial Lung Disease: VA Rating Guide

The VA evaluates interstitial lung diseases, including idiopathic pulmonary fibrosis, asbestosis, silicosis, and nonspecific interstitial pneumonia, under Diagnostic Code 6838 in 38 CFR 4.97. The rating schedule recognizes four compensable tiers: 100% applies when diffusing capacity (DLCO) is less than 40% of predicted, or FVC is less than 50% of predicted, or the veteran requires continuous outpatient oxygen therapy; 60% applies when DLCO is 40% to 59%, or FVC is 50% to 64%; 30% applies when DLCO is 60% to 74%, or FVC is 65% to 74%; and 10% applies when DLCO is 75% to 80%, or FVC is 75% to 80%.

In pulmonary fibrosis, scarring of the alveolar-capillary membrane impairs gas exchange before noticeable lung volume shrinkage occurs. Because standard spirometry (FEV-1 and FVC) can remain deceptively preserved in early interstitial disease, diffusing capacity for carbon monoxide (DLCO) provides the most sensitive and accurate measure of alveolar gas transfer. Under 38 CFR 4.97, an abnormal DLCO independently qualifies the veteran for a compensable rating even if spirometric lung volumes remain within normal limits.

The PACT Act of 2022 established statutory presumptive service connection for veterans with qualifying military environmental exposures. Pulmonary fibrosis, interstitial lung disease, and constrictive bronchiolitis are recognized presumptive conditions for veterans who served in covered locations, including Iraq, Afghanistan, the Persian Gulf, and surrounding regions. Presumptive service connection eliminates the legal requirement to prove a specific military in-service event or provide an expert nexus opinion linking the condition to service.

For veterans without covered PACT Act service, direct service connection can be established by proving in-service occupational toxic exposures. Common historical military exposures include asbestos aboard naval vessels and shipyards (producing asbestosis), silica dust during combat engineering or quarrying operations (producing silicosis), and airborne toxins from waste burn pits and industrial fires. Service personnel records, military occupational specialty (MOS) duties, and deployment logs establish qualifying exposure history.

A thorough claims packet for interstitial lung disease requires high-resolution computed tomography (HRCT) imaging of the chest demonstrating ground-glass opacities, reticular markings, or honeycombing. For veterans requiring supplemental oxygen, the claims file must contain a formal certificate of medical necessity and physician progress notes documenting arterial blood gas (ABG) desaturation below 88% or a resting PaO2 below 55 mmHg, establishing entitlement to the maximum 100% disability tier.