English translation: General Treasury of the Social Security
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swisstell Italy Local time: 19:29 Specializes in field Native speaker of: German PRO pts in category: 122
30 mins confidence:
National Insurance Contributions Office
Explanation: The translation depends on whether you want to 'translate' to an equivalent (UK) situation.
So this is just to offer you another possibility depending on etc.
The Spanish Tesorería etc. is the office you pay your SS to - it covers health insurance AND state pension payments
which is in UK: National Insurance Contributions Office, and the equivalent of the SS number is the NI number.