Parent content types missing during site collection health check

When you run a site collection health check before upgrading to SharePoint 2013, you may find that the parent for a content type is missing.

To fix this issue, you will need to do one of the following actions:

• Delete the orphaned content type.

• Associate the orphaned content type with a parent content type.

For the steps to delete an orphaned content type or to associate a content type with a parent content type, see Create or customize a content type.