German health insurance number, one letter then nine digits, the lifelong identifier printed on the electronic health card. The single leading letter is thin protection, so this is kept out of the general German group and offered to health configurations only.
Label: DE_HEALTH_INSURANCE
Pattern
(?<!\w)[A-Z]\d{9}(?!\w)
Must be caught
Die Karte zeigt A123456789 als Nummer. → A123456789
Versichert unter Z987654321 seit Januar. → Z987654321