pet insurance

i’m thinking about getting pet insurance for my cat. Hes about 10 (they were unsure of age at the shelter) and he’s had some issues with constipation over the past 2 years. that’s caused sold visits to the emergency and some stacked up vet bills. realizing this will probably be a life long thing that he’s on lactulose i’m thinking i should get him insurance. does anyone have any recommendations or know if constipation is considered a pre existing condition?