Are you on metformin, insulin or other blood sugar lowering medications?
200g has traditionally been considered moderately low in protein (it was the standard recommended for most type II diabetics, although some people in the field believe that's a little high for some folks and that 100-150 grams is more reasonable, and a few believe that 100 should be the max).
At 1600 calories, 200g would be 50% of your calories. That might be a little high (especially if you were counting net carbs, that is if you're not counting fiber as a carbohydrate. Fiber is a carbohydrate, it's just an indigestible one).
Personally I follow a lower carb exchange plan (I love exchange plans) based on the plan I found on this website.
http://healthy.hillbillyhousewife.com/foodplans.htm
For the 1500 -1800 calorie plans,
the middle of the road plans run about 200g of carbs
and the high protein plans run about 125-150g of carbs
Three veggie servings can count as one bread exchange, so sometimes I spend some of my bread exchanges on veggies (more volume for the calories, also more fiber).
I'd recommend experimenting. 200g may be perfect for you, or it might be a little high (if you were extremely active, it could even be too low).
Also, did your doctor say whether 200 was a maximum or a minimum target?
If you're on blood sugar lowering medications, you may need to keep carbs above a specific level (or at least eat more frequent meals), so that you don't experience low-blood sugar issues.