How Much Does Radioactive Iodine Treatment Cost for Cats?
If your cat has been diagnosed with hyperthyroidism, your vet may have recommended radioactive iodine treatment (I-131). It’s one of the most effective and permanent solutions—but it can come with a hefty price tag. So, how much does it really cost, and is it worth it?
This guide breaks down the cost of radioactive iodine therapy for cats, what’s included, and how it compares to other treatments.
How Much Does Radioactive Iodine Treatment for Cats Cost?
The average cost of radioactive iodine treatment for cats ranges from $1,500 to $2,000 in most areas. In some regions or specialty clinics, it may be as low as $1,200 or as high as $2,500, depending on your location, your cat’s needs, and what’s included in the treatment package.
This one-time cost may seem high, but it often ends up being more affordable over time compared to lifelong medication and lab tests.
What’s Included in the Cost?
Most clinics include several services in their I-131 treatment fee, such as:
- Initial consultation and thyroid function testing
- Radioactive iodine injection (I-131)
- Hospitalization (typically 3 to 5 days)
- Radiation safety monitoring and care
- Follow-up thyroid level testing after release
Some facilities may also offer additional perks like free re-treatment if the thyroid isn’t fully corrected after the first dose.
Does Insurance Cover Radioactive Iodine Treatment?
Pet insurance may cover radioactive iodine treatment if your policy includes chronic illness or advanced treatment options. However, coverage depends on your plan, whether the condition was pre-existing, and your reimbursement limits.
Always call your provider to confirm what’s included before scheduling treatment.
Are There Additional Costs?
There can be extra expenses, depending on your cat’s condition or the clinic’s policies:
- Pre-treatment lab work or imaging
- Boarding fees if your cat stays longer than expected
- Post-treatment monitoring beyond the standard window
- Travel or lodging if you’re visiting a distant facility
Some clinics require an ultrasound or additional testing before treatment to rule out cancerous growths, which adds to the cost.
Is Radioactive Iodine Worth the Cost?
Yes, for many cat owners, I-131 is worth the investment because it offers a cure—not just management—of hyperthyroidism.
Compared to the ongoing cost of daily medication, repeated blood tests, and dietary restrictions, radioactive iodine is a one-time treatment that restores normal thyroid function in 95–98% of cats.
Cost comparison over 3 years:
| Treatment Option | Approximate Cost Over 3 Years |
|---|---|
| Radioactive Iodine (I-131) | $1,500–$2,000 (one-time) |
| Medication (Methimazole) + Labs | $2,000–$3,500 (ongoing) |
| Prescription Diet + Labs | $1,800–$3,000 (ongoing) |
While upfront costs are higher, radioactive iodine often saves money (and stress) in the long run.
Where Can You Get Radioactive Iodine Treatment for Cats?
Only licensed facilities with radiation permits can perform this treatment. These are typically specialty animal hospitals, veterinary colleges, or nuclear medicine centers.
You may need a referral from your regular vet, and wait times can vary depending on demand and facility availability.
How Long Does the Procedure Take?
The treatment itself is fast—it’s a single injection under the skin. But your cat will stay at the clinic for about 3 to 5 days to allow radiation levels to drop to safe limits before returning home.
Some states have stricter rules, so the stay could be slightly longer depending on your location.
Aftercare: Is It Complicated?
Most cats recover smoothly and require minimal aftercare. Once your cat is home, you may need to limit close contact for a few days, properly dispose of litter, and return for follow-up thyroid bloodwork.
Your vet or the treatment center will give you detailed post-treatment guidelines to follow.
What If My Cat Can’t Have I-131?
If radioactive iodine isn’t an option due to age, health risks, or cost, your vet may recommend alternatives like:
- Daily medication: Methimazole (oral or transdermal)
- Prescription diet: Iodine-restricted food like Hill’s y/d
- Surgical thyroidectomy: Removal of the overactive gland (less common now)
Each option has pros and cons, so work with your vet to choose what fits your cat’s health and your lifestyle best.
Want More Pet Health Insights?
Caring for a cat with a chronic condition doesn’t have to be overwhelming. Click here to explore more helpful guides on treatment options, care tips, and expert advice for pet parents.
Conclusion
Radioactive iodine treatment for cats costs between $1,500 and $2,500 depending on where you live and what’s included. While the upfront expense is higher than daily medication, it’s often a cost-effective and permanent solution for feline hyperthyroidism.
If your cat is a candidate for I-131, talk with your vet about timing, preparation, and what to expect. Check out more expert-backed pet care articles here to stay informed and confident as you support your cat’s health journey.
