Country code for the address of the patient's residence at the time the reportable tumor is diagnosed. If the patient has multiple tumors, the country of residence may be different for each tumor. This data item became part of the NAACCR transmission record effective with Volume II, Version 13 in order to include country and state for each geographic item and to use interoperable codes. It supplements the item Addr at Dx--State [80].

Country of patient's residence at the time of diagnosis is an important element of the patient’s residential history profile and might be useful for understanding risk factors, assessment of patient prognosis, and chances for survival.

Codes Use the International Standards Organization (ISO) 3166-1 Country Three Character Codes, whenever possible, augmented by custom codes. See Appendix B for complete list of country names and corresponding three character alpha codes.