The C codes are for conditional residents, like if you’re a relative of a U.S. citizen. If those conditions have changed, your code will be different. If you have received documents that updated your code, use the new code instead. What If I’m a Permanent Resident Already? If you’...
your initial code began with a “C.” For example, the spouse of a U.S. citizen may enter the U.S. with “CR1” or “CR6” on the immigrant visa. This code gets updated once the conditional resident has remove conditions on residence. ...