May 30, 2024 Lunch & Learn - https://kaileyking.substack.com/p/rating-respiratory-conditions?r=2f4jof&utm_campaign=post&utm_medium=web&triedRedirect=true
§ 4.96(a) Rating Coexisting Respiratory Conditions.
When combining respiratory ratings, VA guidelines direct raters to first assess which individual condition currently meets the highest severity percentage based on documented measurements like reduced airflow or necessary oxygen therapy. That diagnosis forms the baseline rating, but raters still must judge if other issues like sleep apnea then exacerbate predominant condition effects, which could warrant rating elevation.
DCs 6600 through 6817 = NOT combined
DC 6819 and 6820 = NOT combined
DCs 6822 through 6847 = NOT combined
A single rating will be assigned under the diagnostic code which reflects the predominant disability with elevation to the next higher evaluation where the severity of the overall disability warrants such elevation.
Asthma & Sinusitis = one rating
I. Insomnia (analogously rated under DC 9413) & Sleep Apnea (DC 6847)
II.
Because many respiratory conditions overlap in symptoms and anatomical location, VA generally does not assign separate ratings for each unless specific criteria are met. But when conditions affect different anatomical systems or function independently, separate ratings may be warranted.
Here’s a breakdown:
To be rated separately, conditions must:

Here are some examples where separate ratings MAY be permitted:
| Condition #1 | Condition #2 | Notes |
|---|---|---|
| Sleep Apnea (DC 6847) | Asthma (DC 6602) | Can be rated separately if symptoms (e.g., CPAP use vs. inhaler use) are clearly distinguishable |
| Chronic Rhinitis (DC 6522) | Deviated Septum (DC 6502) | If both are symptomatic and cause different impairments |
| Pulmonary Embolism (DC 6817) | Asthma or COPD (DC 6602) | If embolism caused vascular damage distinct from bronchial conditions |
| Tuberculosis (DC 6730) | Bronchiectasis (DC 6601) | Can be separately rated if post-TB residuals affect different areas |
| Interstitial Lung Disease (DC 6835, etc.) | Obstructive conditions | If PFTs show separate impairment from both diseases (rare) |
| Insomnia (analogously rated under DC 9413) | Sleep Apnea (DC 6847) |
These affect different body systems and can be rated separately:
Under 38 C.F.R. § 4.96(a), the following DCs cannot be rated together: “Ratings under diagnostic codes 6600 through 6817 and 6822 through 6847 will not be combined with each other. A single rating will be assigned under the diagnostic code which reflects the predominant disability...”
This includes:
📌 You must pick one primary DC for rating based on predominant symptoms if a veteran has multiple overlapping conditions (e.g., asthma + COPD).
To argue for separate ratings:
Let me know if you want help drafting an argument for a specific case!