Frequent urination

rsqshlt

I am a Type 2 diabetic and my blood sugars have been in a good range for quite some time now, but lately I've been urinating quite frequently -- about 15 times a day. It's not large amounts, but it's not just drips and drabs either. I had a kidney removed due to cancer in December, but the cancer had not spread beyond the kidney. The other kidney is supposedly functioning fine the last time we checked about 2 months ago. Could this be a problem with the diabetes or a kidney problem or what? I don't feel any burning or irritation and the color is clear to light yellow. I'm not drinking a bunch of water or anything, but an example is that this morning I had 2 - 12oz. cans of caffeine free diet coke in about a 4 hour period and went to the bathroom about 7 times. I don't get up in the middle of the night to go to the bathroom, so it's not keeping me awake. Just concerned about what might be going on. Should I make an appt with my doc?