The Copenhagen-based health AI company developed Symphony based on peer-reviewed research from the largest medical coding study, viewing coding as a reasoning task rather than a labeling problem. It’s available via API now.
Medical coding involves converting clinical notes and diagnoses into standardized alphanumeric codes for billing, reporting, and public health data, often leading to errors. The ICD-10-CM, an American coding system, contains 70,000 diagnosis codes, resulting in routine and costly errors.
Corti, based in Copenhagen, has created Symphony for Medical Coding, claiming it surpasses models from OpenAI, Anthropic, Amazon, Oracle, and Microsoft by up to 25% in clinical accuracy benchmarks. Available via API starting today, the performance gap is grounded in Corti’s methodological approach, treating medical coding as a reasoning task rather than a classification problem.
Corti’s method, developed through a peer-reviewed framework called Code Like Humans, focuses on evidence, context, hierarchy, and guideline interpretation. Lars Maaløe, CTO and co-founder, explains that Symphony mirrors expert coders’ decision processes.
Symphony employs four agents: an evidence extractor, an index navigator, a tabular validator, and a code reconciler, reflecting the steps of a human coder. The research involved 1.8 million patient encounters, the largest study of its kind.
Corti highlights the significance of accurate coding, citing a Danish study where its system identified three times the suicide attempts compared to official coding. Andreas Cleve, CEO and co-founder, states that medical coding impacts the data layer driving healthcare.
Symphony operates across US coding environments (ICD-10-CM, ICD-10-PCS, CPT) and European environments without local retraining. ICD-10 coverage for Europe is in beta with expansion into the UK, Germany, France, and Denmark.
Symphony is accessible via the Corti Console, integrates with the Corti Agentic Framework, and supports A2A and MCP standards, with both enterprise and sovereign cloud deployments available. Corti, founded in Copenhagen with offices in New York and London, has raised $100 million and serves over 100 million patients annually, including the NHS.
The Symphony launch is the commercial product built on the Code Like Humans research, aligning with Corti’s strategy of validating ideas in peer-reviewed contexts before production-level application.