A dispute between Blue Cross Blue Shield Association and hospitals has emerged over the role of artificial intelligence in medical coding. The insurer group claims AI tools are driving up costs by flagging more complex diagnoses, while hospitals argue patients are genuinely sicker. This debate is further complicated by the lack of independent chart reviews that could definitively compare coded diagnoses with actual patient care.
In an analysis released September 24, Blue Cross reported that complex inpatient cases rose from 37% to 40% of claims between 2023 and 2025. This added an estimated $942 million in costs, according to the group, without a matching change in treatment. The report also estimated that about $2.3 billion in inpatient and outpatient spending nationwide may be tied to AI-enabled coding, with the new analysis specifically focusing on hospital inpatient care.
AI Tools Flag More Diagnoses, But Are Patients Sicker?
The insurer group points to a disconnect between diagnoses and treatment. For example, claims coded at the highest complexity level for major bowel procedures rose from 10.2% to 22.7%, yet patients at hospitals most likely to diagnose anemia received blood transfusions less often. This mismatch raises questions about whether AI is accurately reflecting patient conditions or simply identifying more billable items.
The group estimates $653 million of the added costs came from secondary diagnoses that moved claims into higher-paying categories. Dr. Razia Hashmi, vice president of clinical affairs, added, “There may be an element of correct coding there, but the likelihood that this is technology-enabled upcoding is higher, in my view.”
Hospitals counter that today’s inpatients are genuinely older and sicker. The American Hospital Association cites a 5% rise in the hospital case-mix index, a measure of patient complexity, from 2019 to 2024. They also point to documented upcoding by insurers, including a $40 billion overpayment to Medicare Advantage plans. Hospital leaders argue that AI helps them document care more accurately and respond effectively to claim denials.
The debate highlights a broader tension in healthcare. While AI can improve documentation and billing accuracy, its use in coding raises questions about cost control and patient record integrity. HIPAA gives patients the right to request and correct their medical records, but handling billing disputes remains complex. The dispute also shows the need for transparency and accountability in how AI is integrated into healthcare systems.
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Blue Cross plans further analyses of AI’s impact on outpatient care and other diagnoses. It also emphasizes the need for independent reviews to provide a clearer picture of AI’s role in medical coding.
The Role of AI in Medical Coding and Patient Records
The Blue Cross Blue Shield Association’s analysis highlights the impact of AI on medical coding, with a focus on secondary diagnoses. These are conditions listed alongside the primary reason for a hospital stay. AI tools can identify these by scanning records or through ambient scribes, which draft clinical notes during patient visits. However, the accuracy and implications of these additional diagnoses remain a point of contention.
The association’s data shows that AI-identified secondary diagnoses moved over 55,000 claims into higher-paying categories, adding approximately $11,000 per extra-complex case. This contributed to the estimated $942 million increase in costs for Blue plans between 2024 and 2025. The financial impact of these changes has significant implications for both insurers and patients.
Patient Records and the Right to Question
For patients, the accuracy of medical records is key. A secondary diagnosis, if incorrect or untreated, can impact future care decisions. Patients are advised to compare their insurer’s explanation of benefits with their discharge summary after a hospital stay, particularly a surgical one. This comparison can help identify any discrepancies or unfamiliar diagnoses.
Federal privacy law, specifically HIPAA, empowers patients to request copies of their medical and billing records. They can also ask providers to correct information they believe is inaccurate. While providers may decline, patients can submit a written statement of disagreement for their file. This process ensures that patients have a say in the accuracy of their medical records.
The U.S. Department of Health and Human Services provides resources for patients to understand their rights under HIPAA, emphasizing the importance of patient engagement in their healthcare. By staying informed and proactive, patients can play a vital role in ensuring the accuracy and transparency of their medical records.