Class of case 11 is assigned when:

Class of case 11 is assigned when the patient was diagnosed at the facility but only underwent some treatment, in this case, chemotherapy, and then went elsewhere for other forms of treatment like radiation. This categorization is important because it helps establish where the primary diagnosis occurred and reflects the treatment course.

In oncology data management, Class of case 11 is utilized to maintain accurate records of patient encounters and treatment histories. When a patient is diagnosed at a facility, it becomes critical for proper data tracking and management to indicate that the treatment plan may not have been wholly completed at that location. Typically, the diagnosis and initial treatment planning occur at the diagnosing center, but patients often seek follow-up treatments, like radiation, at different facilities.

This classification ensures that the facility where the diagnosis occurred receives credit for the initial diagnostic work, even if the patient chooses to get subsequent treatments elsewhere. It reflects an understanding of the patient's journey through their cancer care including how various facilities play roles at different stages.