Aetna’s Feb. 10 reversal preserves NPPs’ ability to fully bill under a supervising physician’s name and National Provider Identifier (NPI) for services incidental to the physician’s diagnosis and treatment of an injury or illness. Services billed incident-to must be conducted in the same office suite where the physician is present and available to intervene if needed. NPPs who bill directly under their own name and NPI will continue to receive payment at only 85% of the fee schedule.