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The UK procedure classification, maintained by NHS England. Required for all NHS inpatient procedure coding alongside NHS ICD-10. Around 10,000 alphanumeric codes structured as a letter followed by two digits with optional decimal subdivision (e.g., H01.1). No encounter-type suffix required.

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Quick start

System identifier: opcs4 
curl -X POST "https://api.$environment.corti.app/v2/tools/coding/" \
  -H "Authorization: Bearer <token>" \
  -H "Tenant-Name: <tenant-name>" \
  -H "Content-Type: application/json" \
  -d '{
    "system": ["opcs4"],
    "context": [{"type": "text", "text": "Patient underwent total hip replacement under general anaesthesia."}]
  }'
API reference →