This data item stores the Derived Rai stage value derived from the values coded in the following SSDIs for the Lymphoma-CLL/SLL schema (9823/3).

• Lymphocytosis [3885]
• Adenopathy [3804]
• Organomegaly [3907]
• Anemia [3811]
• Thrombocytopenia [3933]

The Rai stage is only applicable for Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL) (9823/3) cases where the primary site is bone marrow (C421). For cases with a primary site other than bone marrow (C421), the derived Rai stage will be 8 and all the SSDIs will be coded to 5.

Derivation will be run on all cases diagnosed 1/1/2018 and forward.

The Derived Rai stage can be used to evaluate disease spread at diagnosis, treatment patterns and outcomes over time.

0	Lymphocytosis
1	Lymphocytosis and Adenopathy
2	Lymphocytosis and Organomegaly (Adenopathy is any value other than 5)
3	Lymphocytosis and Anemia (Adenopathy and Organomegaly are any value other than 5)
4	Lymphocytosis and Thrombocytopenia (Adenopathy, Organomegaly and Anemia are any value other than 5)
8	Does not apply, primary site not bone marrow (C421) (All 5 SSDIs should be set to 5)
9	Unknown (All 5 SSDIs are 9 or blank; at least one is set to 9 OR Lymphocytosis is 0,7,9 OR Lymphocytosis is blank and one of the other SSDIs is a value other than 5 or 9)

This field should be left blank for all cases diagnosed prior to 2018, for schemas other than 00795, and when not required by standard setter.