Collaborative Stage Data Collection System

The ICD-O-3 code for nasopharynx, C11.1, for the histologies shown in the table, requires that Site-Specific Factor 25 be coded; the ICD-O-3 codes C11.0, C11.2, C11.3, C11.8, and C11.9 do not require that Site-Specific Factor 25 be coded, and the site-specific factor is left blank. ................
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