No, you gotta call it in. I always call in sick and have the other partner work full days to get free money while I play God of War 3 at home (yea I'm behind lol)... And he will do the same to use his.
Unless you have a manager that doesn't value his job... All it takes is to have someone report you or your manager.
Always use your sickpay, don't leave money on the table for this cocksuckers corporation.