Overview
- Approximately 14,000 core 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:| Extension | Country | Status |
|---|---|---|
| ICD-10 | International | |
| ICD-10-CM | USA | |
| SKS ICD-10 | Denmark | |
| ICD-10-SE | Sweden | |
| ICD-10-FR | France | |
| ICD-10-GM | Germany | |
| NHS ICD-10 | United Kingdom |
system field accepts the extension identifier (e.g., icd10-gm) instead of the base icd10 value.