When I write an order for a test for which there isn't a diagnosis with code in the box above, I simply type in the diagnosis in the comment box next to the ordered test. You must type in the diagnosis before you click on the test or it won't show up even if you type it in. I click the order. Type in the DX and then unclick and reclick. I too would like to figure out how to add a coded diagnosis to the diagnosis chart when I'm in the order window. What I'm doing works so far. no complaints from xray or lab. If they have the written dx, they can code it themselves. After all they are the ones getting paid for the test...not me. They have enough info to do their billing if I give them the dx.