Directives and Forms Catalog - USPS.com® - About

Prefix Directive Type
NOT Notice
POS Poster
PS Form
PUB Publication
SGN Sign
TAG Tag
Following the prefix, the PSIN also includes a unique numerical code (e.g.,
PUB 223) or, for handbooks and management instructions, a unique alphanumeric
code (e.g., HBK AS-353 or MI AS-270-2000-5). The two-letter
portion of the alpha-numeric code identifies the Postal Service policy manual
or topic/organization to which the document relates, as noted in the table
below:
Two-Letter Code Manual or Topic/Organization
AS Administrative Support Manual
DM Domestic Mail Manual
EL Employee and Labor Relations Manual
FM Finance
IM International Mail Manual
IS Inspection Service Manual
PO Postal Operations Manual
A document that belongs to another government agency is identified by that
agency’s prefix, as noted in the following table:
Prefix Government Agency
ATF Bureau of Alcohol, Tobacco and Firearms
CA Department of Labor
DD Department of Defense
FD Federal Bureau of Investigation
FE Office of Personnel Management
GSA General Services Administration
HCFA Office of Personnel Management
IRS Internal Revenue Service
OF/OFI Optional (U.S.) Government Form
OMB Office of Management and Budget
SF Standard (U.S.) Government Form
SSS Selective Service System
TD/TFS/TUS Department of the Treasury
TSP Thrift Savings Plan
W Internal Revenue Service
Note: The PSIN or government prefix and number must be used when
ordering a document.
Publication 223, May 2013 3