---
title: "Pet Insurance and Pre-Existing Conditions: What Can Still Get Covered"
canonical: "https://www.simplyinsurance.com/pet-insurance-pre-existing-conditions/"
description: "Most pet insurance excludes pre-existing conditions. Here's how insurers define them, when a curable one can be covered, and how to protect your pet."
silo: "pet"
published: "2026-09-24"
updated: "2026-09-24"
author: "sa-el"
source: "Simply Insurance"
---
Here's the honest answer first: most pet insurance won't pay for a condition your pet already had before the policy started. The National Association of Insurance Commissioners (NAIC), the group of state insurance regulators, puts it plainly: "Most pet insurance companies exclude pre-existing conditions and hereditary or congenital conditions."

That doesn't mean a pet with a history can't be insured, or that every past problem is ruled out forever. Some insurers will eventually cover a condition that has been cured. And the rules for what counts as pre-existing are pretty specific. Below you'll find how insurers define a pre-existing condition, the difference between curable and incurable ones, how insurers check your pet's history, and what you can do to keep as much covered as possible.

## What counts as a pre-existing condition

The clearest definition comes from the NAIC's Pet Insurance Model Act (Model #633), a template law the regulators adopted in 2022 for states to pass. It says a pre-existing condition is any condition where, before the policy's effective date or during any waiting period, one of these was true:

1. A vet gave medical advice about it.
2. Your pet was treated for it.
3. Based on information from verifiable sources, your pet had signs or symptoms directly related to the condition being claimed.

That third point is the one that catches people. Your pet doesn't need a diagnosis for something to count. If your vet's notes from a checkup mention a limp, itchy skin or a lump, a later claim for that problem can be excluded, even if nobody put a name to it at the time.

The waiting period matters too. Look at the wording again: signs that show up during the waiting period count the same as signs from before you bought the policy. So if your pet starts vomiting in the first couple of weeks of a new policy, anything that turns out to be behind it can be treated as pre-existing.

Under the model law, an insurer that uses the term "pre-existing condition" has to use this exact definition, put it in the policy and post it on its website. States decide for themselves whether to pass the model. Maine, for example, wrote the same definition into its insurance code. If your state hasn't adopted it, the policy's own definition is what counts, so read it before you buy.

## Curable vs incurable pre-existing conditions

Not every pre-existing condition is treated the same way. State regulators, drawing on NAIC tips, split them into two groups.

A curable condition is one that's stable or controlled. The Alabama Department of Insurance says that for pre-existing conditions considered curable, "the company may choose to enforce a waiting period before coverage can begin." In other words, some insurers will cover a cured problem again after a waiting period.

An incurable condition is what the guidance calls terminal, meaning it won't go away. The same guidance says conditions considered incurable, "such as diabetes or cancer may be excluded or may be covered on a limited basis." The model law uses a related term, chronic condition, which it defines as "a condition that can be treated or managed, but not cured."

The model law doesn't define "curable pre-existing condition," so each policy that offers this sets its own rules. If you're shopping because your pet had a problem in the past, ask these questions and get the answers in writing:

- Does the policy ever cover a pre-existing condition that has been cured?
- How long does my pet have to go without symptoms or treatment first?
- Does a vet have to confirm the condition is resolved?
- Which of my pet's past problems would the insurer call curable, and which incurable?

This is also where searches for "pet insurance that covers pre-existing conditions" usually end up. Don't expect a plan that simply ignores your pet's history. What you can look for is a policy that may cover a cured condition after a set period, and that's worth comparing if your pet has had a one-time problem that cleared up.

## How insurers find out about your pet's history

When you file a claim, the insurer can check your pet's medical records to see whether the problem started before your coverage did. Under the model law, "verifiable sources" is the standard, and your vet's records are the most obvious one. Ask how far back the insurer looks and when it asks for records.

Two parts of the model law work in your favor here. First, the insurer has "the burden of proving that the preexisting condition exclusion applies." It's on them to show the condition was there before, not on you to prove it wasn't. Second, if an insurer requires a vet exam to start coverage, it has to tell you what the exam involves before you buy, and it has to tell you that what the vet documents may lead to a pre-existing condition exclusion.

That second point is worth sitting with. An exam can help you by clearing your pet to start coverage sooner, but anything the vet notes becomes part of the record the insurer can use later.

Don't leave anything off an application. The insurer can check the records when you claim, so a missing detail only sets you up for a surprise later.

## Renewals, switching and pre-existing conditions

Here's a question people forget to ask: once a condition is covered, can it become pre-existing when the policy renews?

Under the model law, no. It says "a condition for which coverage is afforded on a policy cannot be considered a preexisting condition on any renewal of the policy." The model also bans waiting periods on renewals and says an insurer can't require a vet exam to renew your policy.

That protection isn't universal, though. The Washington State Office of the Insurance Commissioner warns that "some companies may consider it a pre-existing condition when the policy renews" if your pet was treated for a covered condition during the policy term. The Alabama Department of Insurance gives the same warning. So check how your policy handles renewals. The Alabama department's checklist asks it directly: "Does the policy have renewable benefits?"

Switching insurers is a different story. A new policy has a new effective date, and anything your pet had signs of before that date can be treated as pre-existing under the new policy. Once your pet has a medical history, think hard before switching, and never let coverage lapse between two policies.

## Hereditary, congenital and chronic conditions

These are separate from pre-existing conditions, but they're often excluded or limited in similar ways, and people mix them up. The model law defines all three:

- A hereditary disorder is "an abnormality that is genetically transmitted from parent to offspring and may cause illness or disease."
- A congenital anomaly or disorder is "a condition that is present from birth, whether inherited or caused by the environment, which may cause or contribute to illness or disease."
- A chronic condition is one "that can be treated or managed, but not cured."

The NAIC says most insurers exclude hereditary and congenital conditions, and state regulators note that treatment for them may come with a limited benefit. Under the model law, insurers have to tell you whether the policy excludes coverage for any of these, along with pre-existing conditions.

Orthopedic problems get special rules. The model law lists hip dysplasia, elbow dysplasia, kneecap problems (patellar luxation), disc degeneration and ruptured cranial cruciate ligaments as orthopedic, and lets a policy put a waiting period of up to 30 days on orthopedic conditions that don't come from an accident. That waiting period has to be waivable if your pet has a vet exam after you buy. If your dog has already had trouble with one knee, ask the insurer in writing how that affects coverage for the other knee.

## How to protect yourself

You can't change your pet's history, but you can control when it starts to count against you.

### Enroll early, before symptoms show up

Every problem your pet has before the policy starts, or during the waiting period, is a problem the insurer can exclude. A young pet has very little on record, so enrolling early means almost everything is still coverable. If you're thinking about pet insurance for a new puppy or kitten, sooner is better. Dental disease is a common way this plays out, since early signs of it can land in your pet's records young. We cover that in [does pet insurance cover dental](https://www.simplyinsurance.com/does-pet-insurance-cover-dental/).

### Keep your vet records organized

Ask your vet for copies of your pet's records and keep them somewhere you can find them. If a claim is denied as pre-existing, you'll want to see exactly what the notes say. The insurer has to prove the exclusion applies, and you can only push back if you know what's in the file.

### Ask about the exam that waives the waiting period

Under the model law, a policy with an illness or orthopedic waiting period has to let you waive it with a vet exam. Under the model, you pay for that exam unless the policy says the insurer will. Ask whether the policy offers this and what the exam has to include.

### Read the disclosure document before you commit

In states that follow the model law, insurers have to give you a separate document titled "Insurer Disclosure of Important Policy Provisions." It spells out the pre-existing condition exclusion, waiting periods, deductibles and limits in one place. The model also gives you 15 days after you receive the policy to review it and return it for a full refund, as long as you haven't filed a claim.

### Keep coverage continuous

A lapse means a new effective date, and a new effective date means your pet's whole history becomes pre-existing. Set up automatic payments and don't cancel one policy until the next one has started, if you switch at all.

## What if your pet already has a condition?

You can still insure your pet. The model law lets insurers exclude "one or more preexisting conditions," which means the exclusion is for that condition. Everything new that comes up after coverage starts can still be covered, subject to the rest of the policy.

A few ways to handle it:

- Buy accident and illness coverage for everything else, and set aside savings for the condition that's excluded.
- Ask whether the condition could count as curable and what it would take to have it covered later.
- If full coverage is too expensive for your pet's age or history, look at [accident-only pet insurance](https://www.simplyinsurance.com/accident-only-pet-insurance/). A new injury isn't pre-existing, so it still pays when your pet gets hurt.

To see what coverage would cost, our guide to [how much pet insurance costs](https://www.simplyinsurance.com/how-much-is-pet-insurance/) has the latest averages. If you're still deciding whether it's worth it at all, read [is pet insurance worth it](https://www.simplyinsurance.com/is-pet-insurance-worth-it/). When you're ready, [compare pet insurance quotes](https://www.simplyinsurance.com/compare-pet-insurance-quotes-online/) for your pet, or head back to our [pet insurance hub](https://www.simplyinsurance.com/pet-insurance/) for more guides.

## Frequently asked questions

### Does pet insurance cover pre-existing conditions?

Usually not. The NAIC says most pet insurance companies exclude pre-existing conditions and hereditary or congenital conditions. Some insurers may cover a curable pre-existing condition after a waiting period, while incurable ones like diabetes or cancer may be excluded or covered on a limited basis.

### Is there pet insurance that covers pre-existing conditions?

Most don't, according to the NAIC. What you can look for is a policy that may cover a pre-existing condition that's been cured, once a set waiting period has passed. Ask each insurer whether it covers curable conditions, how long your pet has to go without symptoms or treatment, and whether a vet has to sign off.

### What counts as a pre-existing condition for pet insurance?

Under the NAIC Pet Insurance Model Act, it's any condition where, before the policy started or during a waiting period, a vet gave medical advice about it, your pet was treated for it, or verifiable sources show your pet had signs or symptoms related to it. A diagnosis isn't required.

### Does a symptom during the waiting period count as pre-existing?

It can. The model law's definition covers signs or symptoms that show up during any waiting period, the same as ones from before you bought the policy. That's one more reason to enroll while your pet is healthy.

### How does pet insurance know about pre-existing conditions?

Insurers can review your pet's vet records when you file a claim. Under the model law, the insurer carries the burden of proving the pre-existing exclusion applies, and if it requires a vet exam to start coverage, it has to warn you that the exam's findings may lead to an exclusion.

### Can a covered condition become pre-existing when I renew?

In states that follow the NAIC model law, no: a condition that was covered on your policy can't be treated as pre-existing at renewal. Some companies elsewhere may exclude it at renewal, according to state regulators, so check the policy's renewal terms.

### Is diabetes a pre-existing condition for pet insurance?

If your pet had signs of it, advice about it or treatment for it before coverage began, it can be. State regulators list diabetes and cancer as examples of incurable conditions that may be excluded or covered only on a limited basis.

### Are hereditary conditions considered pre-existing?

The Alabama Department of Insurance says hereditary conditions and certain medical conditions are considered pre-existing. The NAIC model law defines hereditary disorders separately and requires insurers to disclose whether the policy excludes them.

## Sources

- National Association of Insurance Commissioners (NAIC), [Pet Insurance Model Act (Model #633)](https://content.naic.org/sites/default/files/model-law-633.pdf), adopted Summer 2022. Definitions of preexisting condition, chronic condition, hereditary disorder, congenital anomaly or disorder, orthopedic and waiting period (Section 3), required disclosures, the 15-day free look and the "Insurer Disclosure of Important Policy Provisions" document (Section 4), and the burden of proof, waiting period and renewal rules (Section 5). The model does not define "curable pre-existing condition."
- National Association of Insurance Commissioners (NAIC), [Pet insurance](https://content.naic.org/insurance-topics/pet-insurance), consumer topic page last updated April 2025.
- Maine Revised Statutes, [Title 24-A, Section 3153: Definitions](https://legislature.maine.gov/statutes/24-A/title24-Asec3153.html), part of Maine's pet insurance chapter (PL 2021, c. 562).
- Alabama Department of Insurance, [consumer release on pet insurance](https://aldoi.gov/currentnewsitem.aspx?ID=984), February 2018, built on NAIC tips. Curable and incurable pre-existing conditions, renewable benefits and the buyer's checklist.
- Washington State Office of the Insurance Commissioner, [Pet insurance](https://www.insurance.wa.gov/pet-insurance), consumer page. Pre-existing conditions and renewal warnings.
- American Veterinary Medical Association (AVMA), [Pet dental care](https://www.avma.org/resources-tools/pet-owners/petcare/pet-dental-care). How early periodontal disease tends to show up.

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