HealthNLP_Retrievers at ArchEHR-QA 2026: Cascaded LLM Pipeline for Grounded Clinical Question Answering

Md Biplob Hosen, Md Alomgeer Hussein, Md Akmol Masud, Omar Faruque, Tera L Reynolds et al.|April 29, 2026arXiv

Key Takeaway

Cascading multiple specialized modules (query reformulation, evidence ranking, grounded generation, answer-evidence linking) with an LLM outperforms end-to-end approaches for clinical QA, especially when grounding answers to source documents matters for patient safety.

Summary

A clinical question-answering system that helps patients understand their electronic health records by using a four-stage pipeline with an LLM to interpret patient questions, find relevant evidence in medical notes, generate grounded answers, and link answers back to source documents.

applications reasoning evaluation

Key Terms

rag-retrieval-augmented-generation grounding few-shot-learning cascaded-pipeline evidence-grounding