The Difference Between a Rejected Claim and a Denied Claim

The difference between a rejected claim and a denied claim is that

A) a rejected claim is sent back to the provider; errors may be corrected and the claim resubmitted.
B) a denied claim is sent back to the provider; errors may be corrected and the claim resubmitted.
C) a rejected claim may be appealed, but a denied claim may not be appealed.
D) if a procedure or service is unauthorized, the claim will be rejected, not denied.