Is it okay to display Home icon instead of the Back icon in mobile applications?

I am designing a mobile application, it is to schedule medical visits. The initial screen is the list of appointments and from there, user can navigate to see visit details. When the user is in the Visit Details screen, I designed the app bar like this, (Back icon to go to the Appointments list):

When I presented to the client, they wanted the Back to be a Home icon, like this:

However, I don't feel that is standard with mobile applications. Can you advise if the Home icon is "acceptable" for mobile applications? or if the app will get rejected because of the ios UI requirements?