Krux
April 5, 2026
Corti's New AI Beats OpenAI on Medical Coding by 23%
Published: April 5, 2026 at 12:26 AM
Updated: April 5, 2026 at 12:26 AM
100-word summary
Corti just launched Symphony, an AI model purpose-built for assigning diagnosis and procedure codes to patient records. It's beating OpenAI, Anthropic, Google, and Amazon models by up to 23% on industry benchmarks. The real shift is explainability. Symphony links each code it assigns back to the exact sentence in a patient's chart that supports it, so human auditors can verify the AI's reasoning without hunting through records. It works across ICD-10, CPT, and other coding systems without needing retraining when rules change. Medical coding today is painstaking manual work that determines what hospitals get paid. An AI that can handle routine cases accurately means human coders can focus on the...
What happened
Corti just launched Symphony, an AI model purpose-built for assigning diagnosis and procedure codes to patient records. It's beating OpenAI, Anthropic, Google, and Amazon models by up to 23% on industry benchmarks. The real shift is explainability. Symphony links each code it assigns back to the exact sentence in a patient's chart that supports it, so human auditors can verify the AI's reasoning without hunting through records. It works across ICD-10, CPT, and other coding systems without needing retraining when rules change.
Why it matters
Medical coding today is painstaking manual work that determines what hospitals get paid. An AI that can handle routine cases accurately means human coders can focus on the complicated, high-stakes encounters where judgment actually matters.