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Claude's Secret Weapon: Forging Bulletproof Synthea Modules Without Hallucinated Codes

LLMs spit out plausible medical codes that secretly wreck your Synthea simulations. Here's the dead-simple workflow—and Claude skill—that validates every one before it poisons your data.

Claude AI generating a validated Synthea disease module JSON with FHIR code checks

⚡ Key Takeaways

  • LLMs hallucinate medical codes that look real but corrupt FHIR—fix with tx.fhir.org validation curls.
  • Claude Code skill automates full Synthea module creation: research, code lookup, build, test.
  • Synthea's limits (no comorbidities, over-diagnosed elders) demand custom modules for serious use.
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Originally reported by dev.to

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