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Research paperLarge Language Models · Applications · Evaluation & Benchmarks2 sources · Oct 6, 2026

Incidental information contaminates patient notes and disrupts clinical reasoning in large language models

We propose a dual encoding hypothesis of clinical reasoning and distraction in LLMs, with preliminary evidence that LLM components associated with disruption by incidental information also support clinical reasoning.

Key points

  • Large language models (LLMs) are increasingly relied upon to support ambient documentation and clinical reasoning.
  • Here we examine the impact of a failure mode shared between these two applications by assessing their sensitivity to information incidental to the patient encounter.
  • In 576 patient-clinician dialogues, we found that frontier models inserted small-talk exchanges into 35% of notes, while mean quality scores changed by at most 0.20 points on five-point scales.
  • These findings support evaluating resistance to incidental information before clinical use, with safeguards that prevent contamination while preserving clinical reasoning.

Sources (2)

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