Secondary conditions: the ratings most veterans leave behind
You do not have to trace a condition back to service if you can trace it to something already service connected. That single rule is where a large share of unclaimed compensation sits.
A secondary condition is a disability caused or made worse by a condition you are already service connected for. Under 38 CFR § 3.310, it gets service connected as though it were incurred in service, because in the eyes of the regulation, it effectively was.
This matters enormously in practice. Veterans routinely file for the back injury that is documented in their Service Treatment Records and stop there, while the nerve pain running down the leg, the depression that grew out of a decade of chronic pain, and the stomach damage from years of anti-inflammatories all go unclaimed, even though each is separately ratable and none of them requires a single new page from the STRs.
The two flavors
§ 3.310 covers two distinct situations, and it is worth being explicit about which one you are claiming:
- Causation. The service-connected condition caused the new one. Example: service-connected knee instability changes your gait, and the altered gait produces a hip condition.
- Aggravation. You already had the condition, and the service-connected disability made it permanently worse. Here the VA compensates the degree of worsening beyond the pre-existing baseline, so establishing that baseline in the record matters.
What a secondary claim has to show
Three elements, and only one of them is usually work:
- A current diagnosis of the secondary condition.
- An existing service-connected condition, already granted, so nothing to prove.
- A medical link stating the secondary condition is at least as likely as not caused or aggravated by the service-connected one.
Notice what is missing: you do not need an in-service event for the secondary condition. You do not need it in your STRs. It can have appeared fifteen years after you got out. The link runs through the primary condition, not through service.
A useful opinion says the secondary condition "is at least as likely as not caused or aggravated by" the named service-connected condition, and then explains why, referencing the mechanism and the records reviewed. Ask for both prongs (caused or aggravated), because an opinion that rules out causation but supports aggravation still wins.
Common secondary relationships
These are patterns that show up constantly. None of them is automatic. Every one still needs its own diagnosis and its own medical opinion on your specific facts, but they are the places worth looking first.
| Primary condition | Frequently claimed secondary | Typical mechanism |
|---|---|---|
| Back or neck condition | Radiculopathy in a leg or arm | Nerve root involvement, rated separately from the spine itself |
| Knee or ankle condition | Opposite knee, hip, or back | Altered gait and compensating load over years |
| Any chronic pain condition | Depression or anxiety | Long-term pain and functional loss |
| Mental health condition | Sleep apnea, GERD, hypertension | Documented associations, often medication-related; requires an individualized opinion |
| Long-term NSAID use | GERD or gastritis | Medication side effect from treating the primary condition |
| Hearing loss | Tinnitus | Shared acoustic-trauma etiology |
| Diabetes | Peripheral neuropathy, retinopathy, kidney involvement | Recognized complications |
| Amputation or major joint loss | Contralateral limb conditions | Overuse of the remaining limb |
The medication pathway deserves particular attention because it is so widely missed: if the treatment for a service-connected condition damages something else, that damage is claimable. Ten years of prescribed NSAIDs for a service-connected back, followed by a GERD diagnosis, is a straightforward secondary theory.
Where secondary claims fail
No opinion, just a list
The most common failure is submitting the claim with the relationship asserted but no clinician saying it. "My sleep apnea is secondary to my PTSD" is a theory. You need someone with a medical license to say it is at least as likely as not, and to explain the reasoning.
An opinion with a conclusion and no reasoning
A bare "yes, related" carries little weight against a C&P examiner's negative opinion that walks through the literature. The rationale is the substance.
Only causation was addressed
Examiners sometimes answer whether the primary condition caused the secondary, conclude no, and never address aggravation. That is an incomplete opinion. Aggravation is a separate legal theory and an unanswered question is a concrete, addressable defect.
Pyramiding
You cannot be paid twice for the same symptom under two diagnostic codes, § 4.14 prohibits it. Distinct manifestations are fine; the same manifestation dressed in a second code is not. A spine rating for limitation of motion plus a separate rating for radiculopathy of the nerve is normal. Two overlapping mental-health diagnoses producing one set of symptoms will generally be rated together under a single evaluation.
Timing and effective dates
You can file a secondary claim at any point after the primary is granted, the same week or twenty years later. The effective date generally runs from the date you filed the secondary claim (or a protecting Intent to File), not from the date the primary was granted, so there is a real cost to waiting.
One consequence worth planning around: because ratings combine rather than add, secondaries are worth the most while your combined rating is still low. Three secondaries added at 40% combined move you far more than the same three added at 90%.
A secondary claim depends on the primary being service connected. If the primary is denied, the secondary generally falls with it. Fix the primary first, through a supplemental claim with new and relevant evidence, or a higher-level review if the denial looks like an error.
How to work the list
- Write down every service-connected condition you already have.
- For each one, list every ongoing problem you have that could plausibly follow from it, including the medications you take for it and their side effects.
- Get each of those diagnosed if it is not already. No diagnosis, no claim.
- Ask your treating provider for an opinion on the ones with a real mechanism behind them. Bring the primary's rating decision so they can see what is already service connected.
- File them together as a fully developed claim rather than trickling them in one at a time.
Be honest in the filtering. A shotgun list of twenty speculative secondaries with no medical support does not help you, and it slows down the ones that are real.
READY214 maps common secondary relationships from the conditions you already have, tracks the evidence each one still needs, and keeps the whole list in one place. Free, no account needed to look.