The commission headed by retired judge A Arumughaswamy had asked Apollo to submit all the documents related to the treatment of Jayalalithaa, who passed away in December 2016.
This follows allegations that Ms Jayalalithaa's death was triggered by poor medical attention.
The panel has ordered deposed AIADMK leader V K Sasikala's advocate Raja Senthurapandian to appear before it on January 22.
Meanwhile, rebel AIADMK leader T T V Dhinakaran and his supporters called on Ms Sasikala in prison in Bengaluru on Friday.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.