Carta Healthcare Hits 99% Accuracy With Claude

Carta Healthcare built Lighthouse, a clinical data abstraction platform running on Claude via Amazon Bedrock, now processing 22,000 surgical cases a year across 125-plus hospitals. The key engineering decision wasn't model selection - it was context architecture. By feeding Claude patient-specific runtime details like exact procedure timestamps and document sequences, the system replicates how trained human abstractors reason through charts rather than just extracting keywords. Manual abstraction takes up to six hours per complex case and drains over 11,000 labor hours annually at large health systems for a single registry. Healthcare AI deployments have mostly targeted radiology and triage so far; clinical registries represent a less visible but operationally massive automation surface.