M Category

Notes

**Note 1:** This SSDI is effective for diagnosis years 2023+ * For cases diagnosed 2018-2022, leave this SSDI blank **Note 2:** Registrar is required to assign the M category based on the criteria provided in this data item. * If a physician documents the M category, document this in the text field, but don’t use that to code this data item **Note 3:** Code M0 for benign (behavior /0) and borderline (behavior /1) tumors, since by definition they are not metastatic.

NAACCR Item

NAACCR #9613

Metadata

SSDI
Code Description
00 No visible disease on imaging (MRI brain and spine) beyond primary site of disease AND no tumor cells into the cerebrospinal fluid (CSF)
15 Tumor cells in the CSF
25 Visible metastasis in brain
35 Visible metastasis in spine OR Visible metastasis in cervicomedullary (junction)
45 Metastasis outside of the central system
70 Distant metastasis, NOS
88 Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 8 may result in an edit error.)
99 Not documented in medical record M category not assessed
<BLANK> N/A-Diagnosis year is prior to 2023
(1) Aitken JF, Youlden D, O’Neill L, Gupta S, Frazier AL, eds. Childhood cancer staging for population registries according to the Toronto Childhood Cancer Stage Guidelines – Version 2. Cancer Council Queensland and Cancer Australia: Brisbane, Australia; 2021.