This excerpt taken from the PRVT DEF 14A filed Nov 3, 2009.
New CUSIP Number
If the reverse stock split is implemented, a new CUSIP number will be issued for the new common stock and the CUSIP for the underlying common stock will be suspended. We will obtain a new CUSIP number upon submitting notice of shareholder approval of the reverse stock split. Accordingly, your new stock certificates representing the post-reverse stock split shares will bear a new CUSIP number.