EOD Primary Tumor

Notes

**Note 1:** Periosteum is a fibrous membrane that wraps the outer surface of bones. Mucoperiosteum is a compound structure of mucous membrane and periosteum. Cortical bone is the dense compact outer layer of bone. **Note 2:** Macroscopic extraparenchymal extension (code 300) is based on clinical evaluation or macroscopic evidence of extraparenchymal extension at the time of surgery.
Code Description SS2018 T
000 In situ, intraepithelial, noninvasive IS
100 Any size tumor - Invasive tumor confined to gland/duct of origin - Multiple foci confined to substance of parotid gland - Confined to parotid gland, NOS - Confined to salivary gland, NOS - Confined to submandibular gland, NOS - Localized, NOS L
200 Any size tumor - Extraparenchymal extension, NOS - Microscopic extraparenchymal extension ONLY to periglandular soft/connective tissue RE
300 Macroscopic extraparenchymal extension to periglandular soft/connective tissue Extension to another major salivary gland (parotid, sublingual, submandibular, submaxillary) Deep extrinsic muscles (submandibular gland only) - Genioglossus - Geniohyoid - Hyoglossus - Mylohyoid - Styloglossus Facial artery or vein Maxillary artery Pharyngeal mucosa (parotid gland only) Skeletal muscle - Digastric - Masseter (parotid gland only) - Pterygoid - Sternocleidomastoid (parotid gland only) - Stylohyoid RE
350 Spinal accessory nerve D
400 Ear canal External auditory meatus (parotid gland only) Mandible Mastoid/mastoid process (parotid gland only) Nerves - Auricular (parotid gland only) - Facial (7th nerve) (submandibular and salivary gland only) - Lingual (submandibular and salivary gland only) Periosteum of mandible Skin overlying gland (parotid gland only) RE
500 External auditory meatus (submandibular and salivary gland only) Nerves - Facial (7th nerve) (parotid gland only) - Lingual (parotid gland only) Skin overlying gland (submandibular and salivary gland only) D
600 Internal carotid artery (encased) Jugular vein (parotid gland only) RE
700 Pterygoid plates Skull (base, NOS) Further contiguous extension D
800 No evidence of primary tumor U
999 Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record Death Certificate Only U
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