Wow! What a long and unstructured rejection message! Let us try to break it down to see what they are saying.
It starts with Invalid Rendering Provider which gives us a clue that they probably do not have this rendering provider (the therapist) in the records. They then go on to say Rendering Provider ID (which is NPI) no found on file. This is further indication that they do not have a record of the therapist NPI being under your clinic NPI (billing NPI) with them.
If this was all they said, we would believe that your clinic registered as a billing provider with this payer, but this payer is requiring that you register each of your therapist NPI under your billing NPI with them.
However.... there is more to the rejection message. Also within the rejection message they said No Affiliation found to Pay To Provider. When they talk Pay To Provider, they are usually referring to the billing provider (your clinic).
For this reason, we think you are receiving this rejection message because your clinic is not a registered billing provider with this payer.
What should I do?
If you know that you are a provider with this payer, then you will want to call them to find out why they are rejecting. It could be that you are sending a different NPI and/or Tax ID on the claim than what they have on file for you.
If you are not a provider with this payer, you will want to call them to find out how to become a provider for this payer.