We filled out that form and took it with us to our medical exam in Manila, but the medical clinic didn't need it. They had already asked us enough questions in an email before we went so they had all the information that the IMM1017 form asks for. It's not on the CIC "Forms" main page either, so it's certainly not a must IMO....the medical clinic would likely have them on hand in any case if they think you really need to fill one out.