126 - Rejected Entity not found. Rejected Entitys address.

Normally, when a rejection message is sent back and uses terms such as entity, you should receive a follow-up telling you what entity they are referring to.

Unfortunately, the entity, in general, can refer to many things.  It may refer to the patient, the subscriber, the rendering provider, the billing provider, etc.

If the rejection message does not have any more information on what entity they are referring to, then you may have to follow up with the payer to find out why they are rejecting your claim.

IMPORTANT: When calling the payer, make sure to let them know that the claim was EDI rejected.  Usually, when you call, the first person you talk to is in the payer's adjudication department.  At this level, agents can only see claims that made it past EDI (were not EDI rejected).  You may need to ask to talk to their EDI department or whoever handles EDI rejections.  This department will have a record of the rejection.