The Surprising Impact of Coding Intensity on Healthcare Costs: A Deep Dive
Hospitals are quietly driving up healthcare costs through a practice known as coding intensity, according to a recent analysis by Blue Cross Blue Shield (BCBS). This analysis, which examined BCBS claims from 2022 to 2025, reveals a concerning trend: hospitals are billing health plans for more complex care than they actually provide.
Why This Matters: Coding intensity, the practice of billing for more intricate diagnoses than the actual patient experience, significantly inflates healthcare spending. This trend coincides with the growing use of AI in hospitals to document patient visits, raising questions about the accuracy and ethical implications of automated coding.
The Findings:
- The top 10% of hospitals in the study sample were responsible for the majority of the detected increases in coding intensity. By March 2025, nearly 60% of inpatient admissions that could be coded as complex were billed at these facilities, a significant jump from 47% in April 2022.
- The remaining 90% of hospitals experienced a 4-percentage point increase in complex cases over the same period.
A Real-World Example:
- Coding intensity contributed to approximately $22 million in additional spending on maternity care during the study period. Interestingly, despite a rise in coding for postpartum anemia following sudden blood loss, there was no corresponding increase in transfusion claim rates at hospitals with the highest coding intensity growth.
What Experts Say:
- The American Hospital Association (AHA) acknowledges that the increasing complexity of inpatient admissions is partly due to less intense care being shifted to outpatient and office settings. However, AHA hasn't yet reviewed the BCBS analysis.
The AI Debate:
- The use of AI in healthcare billing has sparked controversy. Health insurers themselves are facing scrutiny for employing AI algorithms to evaluate claims submitted by hospitals and other providers. UnitedHealth Group and Cigna are currently embroiled in lawsuits over their alleged use of algorithms to deny patients' medical claims.
The Bottom Line:
The analysis warns that if this coding intensity trend continues, it will accelerate hospital spending and make healthcare less affordable for employers, families, and health plans. This highlights the need for careful monitoring and regulation to ensure that coding practices accurately reflect patient care and prevent unnecessary cost increases.
