EOD Primary Tumor

Notes

**Note:** The cortex of a bone is the dense outer shell that provides strength to the bone; the spongy center of a bone is the cancellous portion. The periosteum of the bone is the fibrous membrane covering of a bone that contains the blood vessels and nerves; the periosteum is similar to the capsule on a visceral organ.

Code	Description	SS2018 T
100	Any size tumor Confined to cortex of bone Extension beyond cortex to periosteum (no break in periosteum) Localized, NOS	L
200	Any size tumor with extension to Adjacent bone/cartilage Beyond periosteum to surrounding tissues, including adjacent skeletal muscle(s)	RE
300	Any size tumor with extension to - Skin	D
500	Discontinuous tumors in the primary bone site Further contiguous extension	D
800	No evidence of primary tumor	U
999	Unknown; extension not stated Primary tumor cannot be assessed Not documented in medical record Death Certificate Only	U

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