It depends on the state. Some states tack on co-pays, child care, etc after CS is calculated. Others include those expenses in the calculation.
which really doesn't make sense. If your kid goes to the doctor once a year or 15 times in a year that's a huge difference in co-pays and $. My kids were sick a lot when they were younger - like 30 infections/5 surgeries before they were 6 years old. In the past 3 years, my kids have hardly been sick at all, yet we've had some dental and eye glasses expenses not covered by insurance. And then there's the emergency care such as if your kid breaks his arm sliding into home plate in a baseball game - $6000 out of pocket not covered by insurance.
how can that be included in the calculations? no one knows what it's going to be.
If you get a choice, I vote for "child support plus one half of medical out of pockets paid within 30 days of submitting the bill to the x." or something like that.