Blue Cross Says AI-Driven Billing Added $942 Million in Hospital Costs Since 2023, Coding Vendors Push Back

The numbers

Blue Cross Blue Shield Association released an analysis on September 24 estimating that hospitals' use of AI-assisted medical coding added $942 million in costs to its health plans between 2023 and 2025. The insurer says the jump came almost entirely from secondary diagnoses, conditions beyond the main reason a patient showed up, that pushed cases into higher-paying reimbursement categories.

According to Luke Chalker, BCBSA's senior vice president of product and data science, roughly 70%, or $653 million, of that added billing was tied to diagnoses that showed no corresponding change in care. His example: hospitals are logging significantly more anemia diagnoses without a matching rise in blood transfusions. "The disconnect between diagnoses and treatment suggests that AI is identifying more billable conditions, not sicker patients," Chalker said, as reported by Healthcare Dive.

BCBSA's report notes the surge happened as 60% of hospital systems adopted AI coding tools, and it says those tools are especially good at catching diagnoses "derived from single laboratory values," the kind of detail a human coder might miss but a machine flags instantly.

Not necessarily fraud, but not nothing either

Christopher Whaley, a health economist at Brown University who studies hospital coding, told CNBC that AI is "accelerating, and in some sense making it easier to capture, the existing and underlying billing incentives that are in the system." He's careful to note that many of the newly captured diagnoses are legitimate and simply went undocumented before. But he also says some conditions "clinically just don't really matter and don't influence the patient's care" even as they unlock a higher-paying code.

That distinction matters. Nobody in these sources is alleging fraud, and no regulator has opened an investigation into any specific hospital system or coding vendor over this. What's being described is a system working exactly as fee-for-service rules allow, just faster and more thoroughly than before.

The coding companies' defense

The vendors whose software is driving this aren't taking the blame quietly, and their argument deserves a fair hearing. Dr. Travis Bias, deputy chief medical officer at Solventum, whose coding platform is used by more than 80% of U.S. hospitals, told Healthcare Dive that calling this a problem only makes sense "in the context of the current paradigm." His point: "We live in a fee-for-service system, we pay for volume, not for value. So yes, if you collect more codes and do more procedures, the payments will increase." Bias said he hadn't independently reviewed BCBSA's analysis closely enough to confirm or dispute its specific findings.

Hamid Tabatabaie, president and CEO of Codametrix, which automates coding for more than 500 hospitals and health systems, doesn't dispute that AI tools are raising costs for payers. But he rejects pinning that on bad intent, telling Healthcare Dive the increases reflect correcting "years of under-documentation" rather than gaming the system. Hospitals were owed this money all along, and AI is just better at the paperwork than humans were.

Chalker said "while multiple factors contribute to coding intensity, the findings suggest AI-enabled coding and documentation tools are playing a role," stopping short of blaming AI for the entire increase.

Where this is headed

Speaking at the Oracle Health and Life Sciences Summit on September 23, CMS Administrator Dr. Mehmet Oz acknowledged the pattern directly. "Short term, AI is going to be inflationary because it's going to turbocharge the ability of the current billing systems to work more effectively," Oz said, as reported by the Epoch Times. He argued CMS is "rushing toward the accountable care element of this game" to curb unnecessary testing and services, predicting that "long-term super intelligence should be deflationary."

Consulting firm PwC projects AI-backed billing tools will contribute to a 9% increase in insurers' medical costs next year, according to Healthcare Dive, a forecast that lands squarely on the side of BCBSA's warning rather than Oz's long-term optimism.

No timeline for a shift toward accountable-care arrangements has been announced. For now, Chalker's warning stands unanswered: "Those costs can eventually show up in the form of higher premiums and out-of-pocket costs." Patients won't see an itemized line for "AI coding surcharge" on their next bill. They'll just see the number go up.