NAACCR Item #3800: Schema ID
|Source of Standard
NAACCR XML: Tumor.schemaId
The derived values in this data item link Site-Specific Data Items (including grade data items) with the appropriate site/histology grouping and accounts for every combination of primary site and histology. The values for this data item are derived based on primary site, histology, and schema discriminator fields (when required). The derived values link Site-Specific Data Items with the appropriate site/histology grouping.
For example, the Schema ID for an adenocarcinoma of the lung is 00360. This value links the Site-Specific Data Items associated with adenocarcinoma of the lung: Separate Tumor Nodules , Visceral and Parietal Pleural Invasion , and Pleural Effusion . The Schema ID would also link to the appropriate grade data items an adenocarcinoma of the lung. The AJCC ID  code for Lung is 36. The AJCC ID  would link to the AJCC TNM Data items (Clin T, Clin N, Etc.) specific to Lung.
AJCC ID  will not be assigned when a site/histology combination is not eligible for TNM staging.
The purpose of the derived Schema ID is to link the appropriate Site-Specific Data Items with the patient’s primary site/histology. This data item is similar to AJCC ID , but includes additional site/histologies that may not be eligible for TNM staging using the current AJCC Staging Manual. AJCC ID  is left blank if a case is not eligible for TNM Staging using the current AJCC Staging Manual. Separating AJCC ID  and the Schema ID allows coding of Site-Specific Data Items for site/histology combinations that are not eligible for an AJCC Stage, but are eligible for Summary Stage.
This data item will also be used to develop edits and could potentially be used for analysis.
Each Site-Specific Data Item (SSDI) applies only to selected primary sites, histologies, and years of diagnosis. Depending on applicability and standard-setter requirements, SSDIs may be left blank.