Collaborative Stage Data Collection System

The ICD-O-3 codes for stomach, C16.1 and C16.2, for the histologies shown in the table, require that Site-Specific Factor 25 be coded; the ICD-O-3 codes C16.0, C16.3-C16.6, C16.8-C16.9 do not require that Site-Specific Factor 25 be coded, and the site-specific factor is left blank. ................
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