What shows up on your credit report when you report your credit card lost/stolen?

For example, if the credit card company changes your account number and moves everything to a new account, does your credit report now say that the old account is closed and you just opened a new account? I'm trying to figure out if you lose your old credit history when you do this—-especially if this is an account you've had for a while, and therefore is one of your oldest accounts since alot of credit is based on how long you've had things.

It should not have a negative impact. Usually the company marks it closed, indicates the payment status, and issues a replacement card with a new number which will show as a current account on your report. If you think there is one on your report, contact the creditor and the credit bureau for resolution.