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.
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.
