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Category III codes have 3 digits and one Alpha. For example, 0019T. They are temporary codes for emerging technology, services, and procedures (taken from CPT 2011).
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
104 = 10000 if digits can be repeated, 5040 if not. The above answers assume a code can start with a 0. If not, 9000 if digits can be repeated and 4536 if not.
The acronym "UPC" stands for Universal Product Code. These codes contain 12 digits, located below a barcode. These codes are usually scanned at the point of sale when an item is purchased.