Congress’s effort to stop surprise medical bills is running into growing resistance from the two groups most affected by the law: doctors and insurers. While lawmakers broadly agree the policy addressed a major consumer problem, there is also rising concern that the payment system created to settle disputes is not working as intended.

According to the report, the process has been flooded with millions more claims from doctors seeking payment from insurers than policymakers expected. That backlog has turned what was supposed to be a limited dispute-resolution mechanism into a much larger fight over reimbursement, increasing pressure on regulators and on Congress.

The story also points to arbitration awards for procedures such as breast reductions and spinal surgeries, suggesting the payment fights are extending well beyond the narrow emergency scenarios many people associate with surprise billing. That has deepened frustration on both sides, with doctors arguing over compensation and insurers pushing back against what they see as costly outcomes.

Even though there appears to be bipartisan agreement that the law has flaws, fixing it may be difficult. Ongoing hostilities between insurers and physician groups could make any legislative changes hard to negotiate, leaving Congress to balance consumer protections with a dispute system that has become far more contentious than expected.