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National Program of Cancer Registries - page 54 / 93

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Extension codes 05–16 Polyps

Not shown: 10 Mucosa, NOS 15 Polyp, NOS

13 Head of polyp

05 Ca in polyp, (non-invasive)

14 Stalk of polyp

16 Submucosa

12 Muscularis mucosa

20 Muscularis propria

11 Lamina propria

Adapted from: Atlas of Diagnostic Oncology, 2nd ed., by AT Skarin, Mosby Wolfe, 1996

Extension codes 05 through 16 are used when coding extension of polyps of the colon and rectum. Code 05 is used when a polyp contains a non-invasive cancer. Code 10 is used for tumors that are confined to the mucosa of a polyp or non-polypoid tumor. Assign code 12 when a tumor invades the muscularis mucosa, including the muscularis mucosa of the stalk of a polyp. Use code 13 when a malignant tumor in a polyp is invasive but confined to the head of the polyp. Code 14 indicates a tumor in a polyp that is invasive but confined to the polyp’s stalk. Assign code 15 when a polyp contains an invasive tumor, but no other information is available. Code 16 is assigned when a malignant tumor either non-polypoid or in a polyp invades the submucosa of the colon/rectum wall. If a tumor invades the muscularis propria of the wall, assign code 20.

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