NHS number
Encyclopedia
The NHS number is a unique number used by the National Health Service
National Health Service
The National Health Service is the shared name of three of the four publicly funded healthcare systems in the United Kingdom. They provide a comprehensive range of health services, the vast majority of which are free at the point of use to residents of the United Kingdom...

 in England and Wales to identify patients.
Scotland's equivilant is called a CHI Number
Community Health Index (Scotland)
The Community Health Index is a register of all patients in NHS Scotland, Scotland's publicly funded healthcare system. The register exists to ensure that patients can be correctly identified, and that all information pertaining to a patient's health is available to providers of care.Patients are...

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