For which of the following reasons should a claim be resubmitted?

A claim should be resubmitted when it requires additional documentation to support the medical necessity of the services provided. In situations where the insurer requires specific information before making a determination on payment, failing to include this documentation can delay processing or result in a denial. Resubmitting the claim with the necessary attachments allows the payer to reassess the claim with a complete understanding of the patient's condition and the need for the services billed.

While there are other scenarios that might warrant resubmission, such as correcting code errors or addressing changes in the patient's insurance, the specific focus in this case is on providing the required support for medical necessity, which is crucial for justifying the services billed to the insurance company.