> ## Documentation Index
> Fetch the complete documentation index at: https://docs.corti.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# ICD-10

> International Classification of Diseases 10th Edition

**ICD-10 is an international code system for diagnoses, published by the World Health Organization.** It is used worldwide, but most nations have implemented their own modification of the original ICD-10 system. We support both the version published by WHO and the modifications of each country.

## Overview

* Around 11,000 assignable codes in the version published by WHO.
* Most countries publish national modifications of ICD-10. Some modifications, such as the British, have a large overlap with the international version. Other countries, such as the US, have little overlap.
* Only conditions that affect patient care should be coded.
* The rules for ICD-10 coding are different for inpatient and outpatient settings. In outpatient, only established diagnoses should be coded, while in inpatient, uncertain and ruled-out conditions should be coded. We, therefore, require the user to specify the setting.

## National extensions

Many countries publish national adaptations of ICD-10 that add country-specific codes or additional granularity beyond the international edition. National extensions are supported as separate coding system identifiers:

export const Available = () => <span style={{
  fontSize: '12px',
  fontWeight: 600,
  padding: '2px 8px',
  borderRadius: '9999px',
  background: 'rgba(22,163,74,0.15)',
  color: '#16a34a'
}}>Available</span>;
export const Beta = () => <span style={{
  fontSize: '12px',
  fontWeight: 600,
  padding: '2px 8px',
  borderRadius: '9999px',
  background: '#d1f526',
  color: '#1a1a1a'
}}>Beta</span>;
export const Alpha = ({system, country}) => <a href={`https://www.corti.ai/contact-us?products=medical-coding,api&use_case=${encodeURIComponent(`I'd like early access to ${system} (${country}) via the Corti Medical Coding API. Please get in touch to discuss my use case and next steps.`)}`} target="_blank" rel="noopener noreferrer" title={`Contact us for ${system} (${country}) alpha access`} style={{
  fontSize: '12px',
  fontWeight: 600,
  padding: '2px 8px',
  borderRadius: '9999px',
  background: 'rgba(59,130,246,0.15)',
  color: '#3b82f6',
  textDecoration: 'none',
  border: '1px solid rgba(59,130,246,0.4)'
}}>Alpha</a>;

| Extension                       | Country        |                               Status                               |
| :------------------------------ | :------------- | :----------------------------------------------------------------: |
| [ICD-10](/coding/icd-10-int)    | International  |                            <Available />                           |
| [ICD-10-CM](/coding/icd-10-cm)  | USA            |                            <Available />                           |
| [NHS ICD-10](/coding/icd-10-uk) | United Kingdom |                            <Available />                           |
| [CIM-10-FR](/coding/cim-10-fr)  | France         |                              <Beta />                              |
| [ICD-10-GM](/coding/icd-10-gm)  | Germany        |                              <Beta />                              |
| [ICD-10-AM](/coding/icd-10-am)  | Australia      |          <Alpha system="ICD-10-AM" country="Australia" />          |
| [ICD-10-CA](/coding/icd-10-ca)  | Canada         |            <Alpha system="ICD-10-CA" country="Canada" />           |
| [SKS ICD-10](/coding/icd-10-dk) | Denmark        |           <Alpha system="SKS ICD-10" country="Denmark" />          |
| [ICD-10-NL](/coding/icd-10-nl)  | Netherlands    |         <Alpha system="ICD-10-NL" country="Netherlands" />         |
| [ICD-10-NO](/coding/icd-10-no)  | Norway         |            <Alpha system="ICD-10-NO" country="Norway" />           |
| [CIE-10-ES](/coding/cie-10-es)  | Spain          |            <Alpha system="CIE-10-ES" country="Spain" />            |
| [ICD-10-SE](/coding/icd-10-se)  | Sweden         |            <Alpha system="ICD-10-SE" country="Sweden" />           |
| [ICD-10-GM](/coding/icd-10-ch)  | Switzerland    | <Alpha system="ICD-10-GM (Swiss Edition)" country="Switzerland" /> |

When enabled, the `system` field accepts the relevant ICD-10 identifier with an encounter-type suffix (e.g., `icd10int-inpatient`, `icd10gm-inpatient`, `cim10fr-outpatient`).