Cornell lists age, obesity and physical inactivity among factors associated with feline diabetes. That does not predict a diagnosis for your cat, but it illustrates why illness risk is not limited to animals that go outdoors. Ask your veterinarian about the individual cat’s health and preventive needs.
If you are considering accident-only insurance because the cat rarely leaves home, compare it with accident-and-illness protection. Ask how each policy would treat diagnostics, continuing medication and follow-up for an eligible new illness. Also identify charges such as examination fees that might need a separate benefit.
A known diagnosis or earlier symptom can change this analysis. A new policy may exclude related care while still covering eligible unrelated problems. Describe the history honestly and ask what remains insurable instead of assuming that an indoor lifestyle changes the exclusion.