Hematopoietic Conversion Document
Released January 9, 2015

As part of the Hematopoietic and Lymphoid project update for 2015, a conversion program has been written to convert some of the Hematopoietic data. The following documents outline the specifics and rationale for these conversions:

A summary of the conversion is provided here.

Step 1 of the Conversion: The Obsolete histologies will be converted to current histologies

  1. The current histology (2010+) can be found in the Hematopoietic & Lymphoid Neoplasm Database & Coding Manual (See Appendix E in the manual).
  2. The histology conversions are being done for cases diagnosed 1/1/2010 and forward. After the conversion, revised edits will not allow obsolete codes to be used for cases diagnosed 1/1/2010+.
  3. The histology conversion will result in a CS schema change for some cases. Detailed information has been provided on how those conversions are handled. This information can be found in the “Hematopoietic Conversion Documentation found in the files provided on this page.

Step 2 of the Conversion: Grade will be assigned to current histologies

  1. Grade will be assigned to histologies for which only one grade is applicable.
  2. A default grade will be assigned to histologies for which there are two or more applicable grades, for the purpose of the conversion only.
  3. Grade 9 will be assigned to histologies for which there is no defined grade.

Step 3 of the Conversion: Primary site will be assigned to current histologies (3 Tables)

There are two main purposes for this conversion

  • For cases diagnosed 2010+, remove primary sites: C420 [Blood] (except for 9761/3), C423 [Reticuloendothelial, NOS], and C424 [Hematopoietic, NOS]. These primary sites should no longer be used.
  • For cases diagnosed 2010+, for those histologies in tables 3 & 4 that have other primary site restrictions, these are being enforced.
  1. Primary site will be assigned to histologies for which only one primary site is applicable (e.g. Leukemias must have primary site C421). Primary site will be enforced through edits for cases diagnosed 2010 and forward.
  2. C421 (bone marrow) will be assigned to leukemia/lymphomas or histologies prominent in the bone marrow with primary site C420, C423, and C424.
  3. Manual review will be required for all remaining histologies (mostly lymphomas) with primary site C420, C423, or C424 to assign a more appropriate primary site. Applicable edits will be enforced for cases diagnosed 1/1/2010 and forward only. See the conversion document for specific histology/primary site instructions.

If you have any questions regarding the conversion, Submit a question to SEER and choose "Hematopoietic Rules (database and manual)" as the subject.