NHS numbers are the unique numbers allocated to registered users of the three public health services in England, Wales and the Isle of Man; the three health systems use a shared numbering scheme.
| Type | datatype | |
| Is personal identifiable information (PII) ? | True | |
| Regular expression | ([0-9]{3})[- ]?([0-9]{3})[- ]?([0-9]{4}) | |
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| Classification | Classification | identifier |
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