CUSIP is an identification number given to all securities. This includes bonds, stocks, mortgaged backed securities, options, and anything that trades on an open exchange and/or is publicly traded as an investment. CUSIP stands for Committee on Uniform Securities Identification Procedures, and are issued by the American Bankers Association. All securities, including T-Bills, have an associated and unique CUSIP number.
Review the definition of T-bill. A T-bill is a short-term debt issued by the U.S. government. Debt is also referred to as "fixed-income" securities in the investment world. They are usually sold in denominations of $1,000 and up.
Go to the Fidelity CUSIP Look up site (Reference 1). Bypass the first two Search fields. In the bottom search box select Treasury if not already selected and then click Search.
Input the attributes on the T-Bill you want the CUSIP for. In the first field, use the drop down menu to select Bills. Enter a range for the maturity date, yield, coupon and ask price. Select Table to view data and click Search. Leave the field blank if you do not know the answer.
Click on the link under the Description column for the T-bill. The CUSIP will be the first data field listed for the security. For instance, the CUSIP for UNITED STATES TREAS NTS paying 4.25 percent and maturing in 11/15/2017, is 912828HH6.