Initial diagnosis of nondisplaced fracture that is now displaced during subsequent visit

How do you code an initial diagnosis of a nondisplaced fracture that is now displaced during a subsequent visit?   Code with the original S.non-displaced code with subsequent malunion 7th character, or code as a new displaced S code with subsequent 7th character.   I have attended two coding webinars and received different answers.  Thanks  Sharon
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