Following the adoption of the Commission Implementing Decision (EU) 2019/1269 of 26 July 2019 amending Decision 2014/287/EU, The European Commission will launch in the coming weeks the first call for new Healthcare Providers (HCP) full members to join the existing 24 ERNs. The concrete date for the opening and closing of the call will be announced soon.
The 24 ERNs were launched in March, 2017 following the first call to create European Reference Networks on rare diseases (2016).
You can find more general information on how to apply to become a member of an ERN here and the EU Commission update here