Schema Discriminator 1: Melanoma Ciliary Body/Melanoma Iris
This input is used for staging
Description
Iris and ciliary body have the same ICD-O topography code (C694). However, for purposes of stage grouping AJCC 8th edition, they each have different definitions for T or primary tumor extension. A schema discriminator is necessary to distinguish between these primary sites so that the appropriate sub(chapter)/schema is used.Rationale
A schema discriminator is used to assign AJCC ID when site and histology alone are insufficient to identify the applicable AJCC staging method and to assign Schema ID, which links each case to the appropriate SSDIs, Grade, Summary Stage and EOD data collection system.Additional Info
**Source documents:** Pathology report, imagingNotes
**Note:** **Schema discriminator for C694** * A schema discriminator is used to discriminate between melanoma tumors with primary site code C694: Ciliary Body/Iris. Code the site in which the tumor arose. * **00672: Melanoma Ciliary Body (see code 1)** Subsites include Ciliary body, crystalline lens, sclera, uveal tract, intraocular, eyeball * **00671: Melanoma Iris (see code 2)** Subsite includes IrisNAACCR Item
NAACCR #3926Metadata
SSDI| Code | Description | Schema ID #/Description |
|---|---|---|
| 1 | Ciliary Body Crystalline lens Sclera Uveal tract Intraocular Eyeball | 00672: Melanoma Choroid and Ciliary Body |
| 2 | Iris | 00671: Melanoma Iris |
| <BLANK> | Primary Site is NOT C694, Discriminator is not necessary |