Accurate codes. Auditable output. One API call.

Integrate the world’s most accurate medical coding AI in hours. One API call returns structured predictions, supporting evidence, and a complete audit trail.

Bad medical coding costs billions.

The tools haven’t caught up. The result is overcoding, missing audit trails, and a retraining obligation you did not sign up for.

Generic LLMs don’t reason codes

Every code in the note comes back. No selectivity, no audit trail, no chain of custody your compliance team can stand behind.

ML pipelines break every October

Coding updates require retraining. Every cycle creates an accuracy gap, and you own the maintenance problem.

RCM services don’t scale

Sold with implementation projects, not API access. Integration means a vendor contract, not a function call.

An AI coding engine that reasons like a trained coder

Reasons over clinical data to determine which conditions should be coded and why, then traverses the coding hierarchy to find the most specific correct code. Every prediction returns source evidence, ranked alternatives, and a justification grounded in coding rules.

Ranked #1 on automated medical coding benchmarks

Highest performance across synthetic, academic, and real-world clinical data.
Accuracy Comparison
F-Score (higher is better)
74%
F1 Accuracy. Outperforming Anthropic (59%), Amazon (58%), OpenAI (48%), and Google (45%).
>25%
Improvement vs. the next-best best system. Beating competitors on both precision and accuracy metrics.  
#1
On noisy clinical datasets. Maintaining lead in real clinical environments, outperforming OpenAI and Google.

What developers are saying

“The methodology behind Code Like Humans is the most promising approach to medical coding we've seen.”
Steve West
Managing Director, Healthliant Ventures and Tanner Health
“Higher-quality coding strengthens the performance of our AI-driven rules engine and billing agents - resulting in more reliable billing, better compliance, and more efficient financial administration.”
Simon Sylvest
CEO and Co-Founder, Apylon

Global coverage across the world’s major coding systems

Built for the complexity of medical coding

Business Product Target Streamline Icon: https://streamlinehq.com business-product-target
Accurate. Ranked #1 on automated medical coding benchmarks. Reasons over full clinical notes - not pattern-matching against text.
Health Medical Notes Streamline Icon: https://streamlinehq.com health-medical-notes
Auditable. Every code traces to the source. Every exclusion is explained. Returns evidence excerpts and rule justifications your compliance team can stand behind.
Ecology Tree Streamline Icon: https://streamlinehq.com ecology-tree
Evergreen. When coding systems updates ship each year, Symphony automatically updates with them. No retraining cycle. No maintenance on your side.
Interface Essential Global Public Streamline Icon: https://streamlinehq.com interface-essential-global-public
Global. One API. ICD-10-CM, ICD-10-UK, ICD-10-PCS, CPT, and more. No data localisation requirements or geography-dependent coverage gaps.
Coding Apps Websites Programming Browser Streamline Icon: https://streamlinehq.com coding-apps-websites-programming-browser
API-native. A single POST request returns structured, ranked codes with evidence. No implementation project. Integrate in hours.

How Symphony for Medical Coding stacks up

Symphony
Generic LLM
Coding reasoning engine
Native
Audit trail per code
Built-in
API-native integration
Yes
Yes
Developer-side retraining
Not required
Complex
Code system coverage
Global
Limited
Time to integrate
Fast
Long & expensive

Explore Agents and build with medical coding Experts

Pre-configured Agents and Experts you can customize and deploy.
Medical Coding Agent
Generate ICD-10-CM and CPT/HCPCS codes
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Prior Authorization Agent
Generate evidence-based prior authorization letters
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Clinical Documentation Improvement (CDI) Agent
Review clinical documentation for accuracy gaps
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Denial Appeals Agent
Appeal denials with evidence-backed responses
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Note Completeness Agent
Ensure clinical note completeness in real-time
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Surgical Registry Intelligence Agent
Automate surgical quality registry data entry
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Diagnostic Entity Extractor Agent
Extract codeable diagnoses and assign codes directly
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Procedure Entity Extractor Agent
Extract codeable procedures and assign codes directly
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Code Validation Agent
Validate ICD-10-CM, ICD-10-PCS, and CPT code sets
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Start building with Symphony for Medical Coding API

Full API access. No card required.

Struck by a Duck

It’s a real medical code. So are thousands more that reveal how each country lives. Dive into the data behind modern medical coding.

Discover the research behind Symphony for Medical Coding

Frequently asked questions

Common questions and answers when building with Symphony for Medical Coding.

How accurate is Symphony for Medical Coding?

Symphony is ranked #1 on automated medical coding benchmarks. Unlike generic LLMs that return every possible code, Symphony reasons over clinical data to select only the codes that should be documented, with ranked alternatives and source evidence for each prediction.

How long does it take to integrate?

Hours, not months. Symphony is API-native, so integration is a single function call. No implementation project, no vendor contract, no custom pipeline to maintain.

How does Symphony handle annual coding updates?

Coding logic is built into the engine, not trained into an ML model - so there's no retraining required when coding guidelines change. Symphony stays current without the October accuracy gap that plagues traditional CAC tools.

Is Symphony HIPAA compliant?

Yes. Symphony is built for healthcare environments, including support for sovereign cloud deployments for organisations with strict data residency requirements.

What does an API response actually return?

Each call returns structured code predictions, the supporting clinical evidence, ranked alternatives, and a written justification grounded in coding rules - everything your compliance team needs for a complete audit trail.

Can't I just use ChatGPT or another generic LLM for coding?

General-purpose LLMs have no coding rules logic, no selectivity, and no audit trail. Symphony is purpose-built to reason through the coding hierarchy the way a trained coder would. With every decision traceable back to the source note.