North Dakota Medical Bill Appeal- Retrospective Review Request is a process used by individuals to dispute an incorrect medical bill. This type of appeal is made after the bill has been paid, and is based on evidence that the billed amount is incorrect or that the services were not provided as billed. The appeal process requires the individual to provide documentation to the medical provider or insurance company to demonstrate that the bill should be adjusted or reduced. The individual may also be asked to provide additional information or documents to support their case. There are two types of North Dakota Medical Bill Appeal- Retrospective Review Request: informal and formal. An informal appeal is made directly to the medical provider or insurance company, and is usually handled by telephone or email. A formal appeal is more formal, and is usually handled through a written request. It may also require that the individual provide documentation or other evidence to support their case.