Short answer: Most US pet insurers verify pre-existing conditions when you file your first claim, by requesting your pet’s veterinary records — Trupanion, for example, asks for records going back 18 months before the policy started, and Embrace asks for 12 months. In states that have adopted the NAIC Pet Insurance Model Act, the insurer carries the burden of proving the exclusion applies.
Pet insurers don’t verify pre-existing conditions at signup — they verify them when you actually file a claim, by requesting your pet’s veterinary history. Understanding that timing matters more than most new policyholders realize.
When Do Insurers Actually Check for Pre-Existing Conditions?
Almost always at claim time rather than at enrollment. Most applications don’t ask for medical records, which can create a false sense that a condition went unnoticed. In practice, the insurer requests the records once a claim arrives and reviews them against your policy’s start date.
Two insurers spell the process out:
- Trupanion says that when you file your first claim, it requests all available medical records from adoption (if you’ve had the pet less than 18 months) or from 18 months before the policy began, through any waiting period, and a claims specialist reviews them.
- Embrace asks for records from the 12 months before your policy began, or since the pet came home, through the end of the illness waiting period. It says it will “not review the records until the first claim” unless you request an early review.
| Insurer | Records requested | When they’re reviewed |
|---|---|---|
| Trupanion | Since adoption, or 18 months before the policy start, through waiting periods | At the first claim |
| Embrace | 12 months before the policy start (or since the pet came home), through the illness waiting period | At the first claim, or earlier on request |
| Fetch | Detailed notes from a vet exam within 180 days of enrollment, if you’re waiving the orthopedic waiting period | Submitted with the first claim |
From each insurer’s own FAQ pages, checked September 2026. Other insurers’ practices vary — ask before you buy.
What Counts as Evidence of a Pre-Existing Condition?
The NAIC Pet Insurance Model Act, the template many states use for pet insurance law, defines a pre-existing condition as one where, before the policy started or during a waiting period, a vet gave medical advice, the pet received treatment, or “based on information from verifiable sources, the pet had signs or symptoms directly related to the condition” being claimed. In practice that means:
- A formal diagnosis before the policy’s effective date — the clearest case
- Documented symptoms without a diagnosis — Healthy Paws states that “there doesn’t need to be a diagnosis,” so a vet note mentioning limping, vomiting or scratching can be enough to link a later claim to an earlier issue
- Things you noticed yourself — Embrace’s definition includes any problem “noticed by you or your veterinarian before your policy started, even if your pet never went to see the vet for it”
- Records from previous vets, shelters and specialists, not just your current clinic
- Anything that starts during the waiting period — Fetch says conditions that occur during waiting periods are treated as pre-existing
- Bilateral conditions — some insurers treat a problem on one side of the body as pre-existing for the other side too. Healthy Paws excludes the second cruciate ligament if the first was injured before enrollment or during its waiting period, and Embrace won’t cover a recurrence on the opposite side
For what is and isn’t excluded once a condition is flagged, see does pet insurance cover pre-existing conditions.
What Rules Protect Pet Owners?
Pet insurance is regulated state by state. In states that have adopted the NAIC Model Act — more than a dozen, including California, Florida and Washington — the Act sets several ground rules:
- The insurer has the burden of proof that a pre-existing condition exclusion applies to the claim
- A covered condition can’t become pre-existing on renewal of the same policy
- Waiting periods are capped at 30 days for illness and non-accident orthopedic conditions, and accident waiting periods are prohibited — more in pet insurance waiting periods explained
- Exam requirements must be disclosed — if an insurer needs a vet exam to start cover, it must tell you upfront that the exam notes may lead to a pre-existing exclusion
Can a Pre-Existing Condition Become Covered Later?
Sometimes. Several insurers distinguish curable conditions (an ear infection, a bout of diarrhea) from chronic ones:
- ASPCA Pet Health Insurance: a condition that’s cured and free of treatment and symptoms for 180 days is no longer pre-existing — except knee and ligament conditions, which stay excluded (ASPCA)
- Healthy Paws: conditions that fully resolve and stay symptom- and treatment-free for 365 days may become eligible (Healthy Paws)
- Embrace: the exclusion may be removed after 12 consecutive months symptom- and treatment-free; Embrace lists bone and joint issues, allergies, cancer, diabetes and thyroid imbalances among the conditions it treats as incurable (Embrace)
How Should You Handle This Honestly and Proactively?
- Disclose known conditions at signup rather than hoping they go unnoticed — being upfront doesn’t change eligibility, and it avoids a surprise denial at the worst moment
- Request an early records review if your insurer offers one (Embrace does on request; Trupanion prepares a summary of pre-existing conditions for new pets), so you know what’s excluded before you need to claim
- Keep your pet’s full veterinary history organized, including records from shelters and previous vets
- Enroll before symptoms appear, not just before a formal diagnosis — waiting until something seems “worth mentioning” is often already too late. Cover doesn’t start the day you buy, either; see does pet insurance start immediately
- Think twice before switching insurers once your pet has a condition, since the new insurer will treat it as pre-existing
What If a Claim Is Denied as Pre-Existing?
Ask the insurer in writing which record entries it relied on. Vet notes are sometimes vague or record a symptom that was unrelated to the later problem; your vet can write a clarifying letter explaining what an earlier note meant (they shouldn’t alter the original record). Then use the insurer’s formal appeal process. If that fails, your state insurance department handles complaints — states that follow the Model Act require insurers to give you the department’s contact details when the policy is issued.
For how pre-existing exclusions affect what you pay overall, see how much pet insurance costs per month.
This article is general information, not insurance or legal advice. Definitions, look-back periods and state rules vary — check your own policy documents and ask your insurer before relying on coverage.
Sources
- National Association of Insurance Commissioners — Pet Insurance Model Act (Model 633), 2022
- Trupanion — How can you tell if a condition is pre-existing for a recently adopted pet?
- Embrace Pet Insurance — What is a medical history review, and how would I request one?
- Embrace Pet Insurance — Pet insurance for pre-existing conditions
- Healthy Paws Pet Insurance — Coverage and exclusions
- ASPCA Pet Health Insurance — What’s covered
- Fetch Pet Insurance — What is a waiting period for pet insurance?
