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SEER Inquiry System - Report
Produced: 03/20/2026 6:15 PM
Question 20130161
Inquiry Details
References:
Heme & Lymph Manual & DB
Question:
Discussion:
1/11/13 Bone marrow bx: B-cell acute lymphoblastic leukemia. Flow cytometry of peripheral blood shows leukemia involvement.
PET scan shows involvement of abdominal lymph nodes, spleen and throughout the bones. The patient has an elevated WBC, anemia and thrombocytopenia.
The answer to SINQ 20120047 (which is no longer visible in the system) said to code B lymphoblastic leukemia/lymphoma to bone marrow for primary site if there is bone marrow involvement. The Heme/Lymph Manual Rule PH7 says to code bone marrow as the primary site if bone marrow is the only site involved.
Following the manual, the primary site would be C779. However, according to the answer to SINQ 20120047, the primary site would be C421. Which is correct?
Answer:
For cases diagnosed 2010 and forward, access the Hematopoietic Database at http://seer.cancer.gov/seertools/hemelymph.
Per the Heme DB, the histology B-cell acute lymphoblastic leukemia is synonymous with B lymphoblastic leukemia/lymphoma, NOS. Per Rule PH8, for a neoplasm that can manifest as either leukemia lymphoma or leukemia lymphoma, one is to code the primary site to the site of origin when lymph node(s) or lymph node region(s), tissue(s) or organs are involved. The Note 4 instruction states it is necessary to go to Module 7 (Rules PH18-PH27) to code the more specific primary site. In this case, use Rule PH22 to code primary site to C779 [lymph nodes, NOS] for the case you describe.
In this case, there is involvement of abdominal lymph nodes, spleen, bone marrow and bone. There is no indication of the primary site. Per the Heme DB, the most frequent sites of involvement for the lymphoma are bone and lymph nodes. This is a Stage IV lymphoma.
The now inactivated SINQ 20120047, stated that based on the sites of involvement, this histology could be coded as either leukemia or lymphoma. If the only involvement is the bone marrow, the site is coded to C421 [bone marrow]. The involvement of peripheral blood does not change the primary site because such involvement is part of the leukemic process.
SEER*Educate provides training on how to use the Heme Manual and DB. If you are unsure how to arrive at the answer in this SINQ question, refer to SEER*Educate to practice coding hematopoietic and lymphoid neoplasms. Review the step-by-step instructions provided for each case scenario to learn how to use the application and manual to arrive at the answer provided. https://educate.fhcrc.org/LandingPage.aspx.
