The Japanese Basic Pension Number is composed of 10 numerical digits. The first four digits indicate the office of issuance. The last six digits are sequential. The date of birth is not shown in the number.

If the Basic Pension Number is not known, the following information is needed to obtain the number:

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  The worker/contributor’s full name

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  The date of birth

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  Current address

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  Sex

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  Name of employer and period of work in Japan