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Example: The patient has a 5cm tumor that involves the dorsal surface and anterior 2/3 of tongue. Code the primary site to C028 (overlapping lesion of tongue).

Exception: Skin cancers overlapping sites in the head and neck only: assign the primary site where the bulk of the tumor is; do not use C44.8.

4. Code the site of the invasive tumor when there is an invasive tumor and in situ tumor in different subsites of the same anatomic site.

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c. Code Unknown Primary Site (C809) if there is not enough information to assign an NOS or Ill-Defined Site category.

Note: Assign code C76.0 for occult head and neck primaries with positive cervical lymph nodes. Schema discriminator 1 will identify these cases from others coded to C76.0.

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