Hi, thanks for the reply. I have not submitted my visa application yet or my EOI. I am trying to get organised for when this is needed next month. The old passport number has been requested as I have travelled to Australia on an old passport in the past so they have requested this information.
once I receive the passport details I can complete my health declaration and be provided with my HEPID to book my medical with.
here is the link for Immi account to set up and complete Heath declaration https://www.border.gov.au/Trav/Visa/Heal/meeting-the-health-requirement/health-examinations/my-health-declarations