Chronic kidney disease is one of the most common serious illnesses in older cats, and it is also one of the clearest examples of why the timing of a pet insurance policy matters. A cat diagnosed after enrollment is usually covered. A cat diagnosed before it is usually not. This guide explains how coverage works for kidney disease, what the care involves, and what to look for in the policy.
Last reviewed: October 2026. Premium figures come from a MoneyGeek report on cat insurance updated August 26, 2026. Sources are listed at the end.
What Chronic Kidney Disease Is
The kidneys filter waste from the blood. In chronic kidney disease (CKD), they gradually lose that ability, and the damage cannot be reversed. Early signs include drinking and urinating more, weight loss and a dull coat. Many cats are diagnosed at a routine senior checkup, when bloodwork or a urine test shows a problem before symptoms are obvious. The Cornell Feline Health Center has a detailed owner guide to the disease and its stages.
MoneyGeek notes that cats in double digits show higher rates of chronic conditions such as kidney disease, hyperthyroidism and arthritis. Some breeds are at higher risk because of inherited conditions: for example, Persians and related breeds can carry polycystic kidney disease.
What Care Involves
- Regular bloodwork and urine tests to track how the disease is progressing.
- A kidney-support (renal) diet. Usually the single most important part of long-term care.
- Medication for blood pressure, nausea or phosphorus control, depending on the stage.
- Fluids, given at home or in the clinic as the disease advances.
- Hospital care if a cat has a crisis, such as severe dehydration.
We did not find a reliable U.S. average yearly cost for kidney disease, because it depends on the stage and on how a cat responds. That is also why the cost question is really about duration: CKD is a condition measured in years, not weeks. Ask your vet for a written estimate for the next 6 to 12 months.
How Insurance Treats Kidney Disease
| Situation | What usually happens |
|---|---|
| Diagnosed after enrollment and after the waiting period | Treatment is generally covered, and the condition continues to be covered at renewal while the policy stays active |
| Symptoms or abnormal bloodwork before enrollment | Treated as pre-existing, generally excluded |
| Diagnosed during the waiting period | Generally excluded |
| Prescription renal diet | Depends on the policy: some pay when prescribed for a covered illness, others exclude all food |
| Hereditary kidney disease (such as PKD) | Depends on whether the policy lists hereditary conditions as covered |
The waiting period for illness is often between 14 days and several months, depending on the insurer. See our waiting periods guide and how pre-existing conditions work.
An Example: First Year After Diagnosis
This is an illustration, not a real claim. A cat insured since age 6 is diagnosed with kidney disease at 11. The first 12 months of tests, diet and medication cost $1,800. On the standard plan ($500 deductible, 80%, $5,000 limit):
| Step | Amount |
|---|---|
| First-year costs | $1,800 |
| After $500 deductible | $1,300 |
| Insurer pays 80% | $1,040 |
| You pay | $760 |
At age 11 the average premium is $54 a month, or about $648 a year, so the insurer would pay more in this one year than the premium. If the deductible applies per condition and not per year, later years would be cheaper still; if it resets each year, you would pay it again. See annual vs. per-incident deductibles.
What to Check in a Policy
- Is a chronic condition covered for life of the policy? Some plans cap lifetime payments for a single condition.
- Is the renal diet covered? Ask for the answer in writing.
- How does the deductible work? Per condition is better for a chronic illness.
- What is the annual limit? A limit of $5,000 normally covers the early stages, but advanced care can use more.
Frequently Asked Questions
Can I get insurance for a cat that already has kidney disease? You can buy a policy, but kidney disease itself will be excluded. It may still cover accidents and unrelated illnesses.
Does insurance cover kidney tests? Diagnostic tests for a suspected illness are generally covered. Routine annual bloodwork is a wellness item.
When should I insure a cat to be covered for kidney disease? Before any sign of it. In practice, that means a kitten or a healthy young adult cat, well before the senior years.
The Bottom Line
Kidney disease is covered when it starts after the policy does. The most important step is enrolling early and keeping the policy continuous, and the most important detail to confirm is how the policy treats chronic conditions and prescription diets.
Sources
- MoneyGeek, Average Pet Insurance Cost for Cats, updated August 26, 2026.
- Cornell Feline Health Center, Chronic Kidney Disease.
This article is general information, not veterinary or insurance advice. Premiums and policy terms vary by company, location and policy date.