Insurer Group Links AI Coding to Higher Hospital Charges
The Blue Cross Blue Shield Association found that hospital systems increasingly code patient stays as more complex, adding nearly $1 billion in costs over two years. The group said coding changes have not been matched by evidence of sicker patients or more treatment. It warned that AI tools identifying secondary diagnoses may be driving higher spending and premiums.
The Blue Cross Blue Shield Association reviewed two years of hospital billing and found that stays were increasingly classified as more severe, adding almost $1 billion in costs. The insurer group said treatment patterns did not shift in ways that would explain the higher complexity.
More than three in five hospital systems now use AI-enabled tools that review lab results and electronic records for secondary diagnoses, potentially placing patients in higher-reimbursement categories. BCBSA cited anemia after major bowel surgery, noting more such diagnoses without a matching rise in transfusions.
If the findings hold, patients, employers, and taxpayers could face higher premiums and out-of-pocket costs as hospitals and insurers negotiate over coding. AI oversight may become a focus for regulators and health systems, potentially affecting how diagnoses are documented and audited. The impact may depend on whether payers can verify severity and whether hospitals adjust tools.