You may first want to contact the Medicaid Expansion Contact Center to discuss the claim. If a provider still disagrees with a BCBSND determination on benefits or claims, the decision may be appealed. For NEMT providers, this will most likely fall into the post service claim appeal, which could include scenarios such as a claim denying for timely filing.
You would not use an appeal for something that can be done via the correction process, such as adding the authorization number to the claim if it were missed upon original submission.
More information regarding the appeal process and timeframes can be found on the BCBSND Appeals webpage.