---
kind: "section"
citation: "10 C.F.R. § 9.301"
title: "10"
number: "9.301"
heading: "Social Security account numbers in documents sent by mail."
url: "https://uscodex.org/cfr/10/9.301"
---

# §9.301. Social Security account numbers in documents sent by mail.

- (a) Social Security account numbers shall not be visible on the outside of any package sent by mail.
- (b) A document sent by mail may only include the Social Security account number of an individual if it is determined by the head of the agency that the inclusion of a Social Security account number is necessary.
- (c) The inclusion of a Social Security account number of an individual on a document sent by mail is necessary when—
  - (1) Required by law; or
  - (2) **Necessary to identify a specific individual and no adequate substitute is available.**
- (d) Social Security account numbers must be partially redacted in documents sent by mail whenever feasible.

## Notes

### Source

Source: 85 FR 33529, June 2, 2020, unless otherwise noted.

### Authority

Authority: Atomic Energy Act of 1954, sec. 161 (42 U.S.C. 2201); Energy Reorganization Act of 1974, sec. 201 (42 U.S.C. 5841); 44 U.S.C. 3504 note. Subpart A also issued under 31 U.S.C. 9701. Subpart B also issued under 5 U.S.C. 552a. Subpart C also issued under 5 U.S.C. 552b. Subpart E also issued under 42 U.S.C. 405 note.