When claim form errors are identified by the third-party payers, the claim is then rejected with a request sent to the m

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When claim form errors are identified by the third-party payers, the claim is then rejected with a request sent to the medical facility to resubmit with corrections. What are some of the common errors that cause rejection? What steps would you need to take if a claim is rejected, or denied, by the insurance company? What affect will it have on the practice?