Rendering Provider National Provider Identifier (NPI).

Rejection: Acknowledgement Rejected for Invalid Information - The claim encounter has invalid information as specified in the Status details and has been rejected. Rendering Provider National Provider Identifier (NPI).
What happened: The NPI in box 24j does not match what the payer has on file

Resolution: Verify the claim was sent to the correct payer. Call the payer, verify NPI, and update the claim as necessary.