It depends
There are many ways to correct documentation and some depend on the format of the original documentation and whether it is still in "draft" mode or not.
For example
A handwritten hospital admission note that has been signed & dated by the provider, but is missing any assessment/plan. You query physician; s/he should go back to the the original document ... if there is ROOM on the page, the information can be added right there BUT the provider must initial/sign and date the added material.
If it is a dictation and you catch that there is missing information before it has been finalized/signed, the provider can edit the document to include the missing info and just sign it.
Hope I am making myself clear.
The key is that this is a legitimate correction/addendum to reflect what actually occurred, but which may not have been correctly documented.
Hope that helps.
F Tessa Bartels, CPC, CEMC