Dynamically adding form fields

I am using CF10 on IIS

I have a data entry form where the user can enter the various medical diagnosis attributed to a medical encounter. Right now I have the list set to 25 dx.

What I would like to do is make the list dynamic, so that if you enter a dx, the form automatically adds a data entry field for the NEXT dx. Note that the field name and type is exactly the same. It will just populate the value as a list.

So, on the change event of a dx, it would add a new row to the data entry page to allow for the next dx. This would allow the operator to enter an unlimited number of dx into a single form.

I dont want the page to move on to another page to add the next dx. That would be simple, I realize. The customer would much prefer the dynamic route on a single page.

Thoughts?