I have seen a colleague take all the sick leave that we entitled until she has used up all the coverage of the medical benefit.
What my company did is, just send a letter to remind her, you have used up all the leave and the coverage. If you wanna seek for medical advice, the cost will be under her. Regarding the leaves, I have forgotten already.
But still, it is normal for them, especially non-executive. They will think it is supposed to take.