when I was initially diagnosed at diabetic, my doctor sent me to see a nutritionist.  She gave me a handout on eating, which I still have. On it she wrote:  minimum of 30 grams of carbs for each meal:  breakfast, lunch, dinner;  60 grams carbs at each of those meals; 35-42 grams protein for each lunch and dinner.   That was for me, for my weight and size.  So, those numbers will vary for each person, based on their weight, etc.

When I was in the hospital, I looked at the menu. They had listed how many carbs were in each item.  I think some of those meals I was getting 50 carbs per meal.

So, based on that limited information, I would say 30 grams carbs is not too many.  It comes down to how many carbs one is consuming in addition to that oatmeal.  If I am eating oatmeal, I am adding milk to that oatmeal.