My Gabby was diagnosed with CKD and in the 2 years before she passed, her Kidney values stayed normal eating a low phosphorus, canned commerical diet (Wellness Turkey, EVO, and Weruva). She passed from a stomach tumor, not CKD.
Bandit's new vet thinks he has early stage CKD, also. It's very common in older cats, especially if they ate dry food for a significant portion of their life like Bandit did. We're just keeping an eye on his (slightly elevated) Creatinine levels. Most cats over the age of 12 have some loss of kidney function, even if their bloodwork doesn't show it yet. He already eats lower phosphorus, low carb foods (Weruva & Wellness) so we're not really changing anything except mixing some extra water in with his food to make sure he stays good and hydrated. Kidneys work best when cats are well hydrated and eat high quality proteins-they don't have to work as hard.
As for his diabetes, he just went back off insulin yesterday, and we're gonna see how that takes. It's definitely possible for cats to have these two concurrant conditions and to stay healthy as long as they're well managed.
This chart is a bit better to look at because it lists the carbs, too:
http://catinfo.org/docs/FoodChartPhosphorus9-22-12.pdf
Here's a list of the foods I feed Bandit:
Wellness Core Beef, Venision & Lamb
Wellness Core Turkey, Chicken & Chicken Liver
Wellness Core Kitten
Weruva Paw Lickin Chicken
Weruva Cats in the Kitchen Chicken Frick-a-zee
Weruva Steak Frites