Wiki Should / Can Coders Enter Charges ?????

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My Question for the forum is should coders be entering charges or is it the responsibility of the providers, nurses, and other clinical staff to enter their own charges for service?? Where would I be able to find a guideline that tells what the law is for this. My personal thought is that if I the coder enters a providers charge it is not verified by the provider we also have an issue of the providers do not document enough to pick a charge. any help would be greatly appreciated.