The Silicon Protocol: When RAG Retrieves Wrong Patient Charts in Healthcare AI (2026)

Semantic search pulled Mary Johnson’s diabetes history for John Smith. The LLM generated treatment recommendations. Same name similarity. $850K HIPAA violation. RAG retrieval failure in healthcare. Vector search ranked Mary Johnson’s diabetes history (similarity 0.94) for John Smith query because both charts contain identical medical terminology. Result: $850K HIPAA fine for unauthorized PHI access. Metadata filtering before similarity search prevents cross-patient retrieval.