---
oid: "2.16.840.1.113883.4.1"
description: "United States (US) Social Security Number ([SSN](https://www.ssa.gov))"
last-modified: "2026-01-09"
parent-oid: "2.16.840.1.113883.4"
---

## OID: `2.16.840.1.113883.4.1`

```asn1
{joint-iso-itu-t(2) country(16) us(840) organization(1) hl7(113883) commonPublicNamespaces(4) ssn(1)}
```

### Description

United States (US) Social Security Number ([SSN](https://www.ssa.gov))

**Classification:** Healthcare; Identification scheme

### Supplementary information

SSNs are assigned by the U.S. Social Security Administration. Internal Revenue Service (IRS)-assigned Individual Taxpayer Identification Numbers (ITINs) are often used as drop-ins for social security numbers.

### Child OIDs

No child OID

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