An ATIN is an Adoption Taxpayer Identification Number issued by the Internal Revenue Service as a temporary taxpayer identification number for the child in a domestic adoption where the adopting taxpayers do not have and/or are unable to obtain the child's Social Security Number (SSN).
| Type | datatype | |
| Is personal identifiable information (PII) ? | True | |
| Regular expression | [0-9]{9} | |
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| Classification | Classification | identifier |
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