Lost credit card replaced with new card and new numbers. Credit score affected?
The true answer is it depends because  it is up to the credit card issuer to follow the right path when issuing a replacement credit card. http://www.bankrate.com/finance/credit-cards/will-replacement-card-hurt-my-score.aspx Typically, issuers will transfer the account history to the new trade line, says Barry Paperno, the consumer operations manager at FICO, the creator of the FICO scoring formula. The new account should have the old open date, so you should retain your payment history, he says. The credit limit and balance should also stay the same. http://blog.credit.com/2014/02/lost-or-stolen-credit-card-hurt-your-credit-scores-76724/ How Issuers Report Replacement Cards We asked the major card issuers how they report replacement cards to credit reporting agencies: American Express: The new card has the same open date and “Member Since” year as the previous card. The balance on the old account number is transferred to the new account number. All payment history transfers over. Bank of America: All transactions and account history are transferred to the new account number when there is a card replacement or renewal. Capital One: The new account number with all the original account data (original open date, etc.) is reported along with a notification to the bureaus that the new account number is replacing the old.  The two tradelines can then be ‘merged’ into one, so that all the applicable payment history, balance, etc. is now under the new account number. Chase: The original tradeline does not change. The history on the account remains, just the account number field is updated with the new account number. There is no “new” tradeline in this scenario.