Blue Cross study links AI coding to $942 million in costs

The Blue Cross Blue Shield Association says AI-assisted medical documentation and coding coincided with $942 million in added inpatient costs for its member insurers over 2024 and 2025, compared with 2023, as hospitals recorded more complex cases without corresponding increases in some treatments examined in its study. The association attributed $653 million of the increase during 2024 and 2025 to more frequent billing for secondary diagnoses, conditions separate from the primary reason for care. It said tools that scan patient records and ambient systems that draft notes from clinician-patient conversations can help surface those conditions. More extensive documentation can change how a case is classified and the reimbursement attached to it. The findings concern an association study, and the reports reviewed do not establish that AI caused the cost increases or determine how much of the additional coding reflects previously undocumented illness. More complete records could identify legitimate conditions; insurers have also raised concerns that additional diagnoses may increase payments without a corresponding change in care.