California Cancer Reporting System Standards Volume I: Abstracting and Coding Procedures
In those cases where a patient is being followed by more than one reporting facility, the regional or the central registry may designate a facility responsible for follow-up in an effort to prevent physicians and patients from receiving requests for information from many sources.
Shared follow-up which discloses the source or name of the facility requires a signed agreement from each participating registry.
Follow-up may be shared without a signed agreement as long as the source is not disclosed.
This does not preclude a facility's registry from submission of more current information about its patients. Shared follow-up is instituted only by agreement among participating facilities in a region.