Pet insurance covers prescription food when your vet requires it to treat a covered condition like kidney disease, diabetes, or food allergies, so you won't pay full price when your pet needs specialized nutrition. It doesn't cover prescription food for pre-existing conditions or general weight management.
Just like other treatments, prescription food coverage follows your policy's deductible, reimbursement percentage, and annual limits. Your vet has to prescribe the specific diet as treatment, and you'll need their paperwork when filing your claim.