Data Last Updated: June 9, 2025

Mitotic Rate Melanoma

Description

Mitotic Rate Melanoma, the number of mitoses per square millimeter based on pathological evaluation, is a prognostic factor for melanoma of the skin. Mitotic count is a way of describing the potential aggressiveness of a tumor. Record the number of cells actively dividing as determined by the pathologist. The count will vary according to the type of tumor.

Notes

**Note:** **Physician Statement** * Physician statement of the Mitotic Rate Melanoma can be used to code this data item when no other information is available.
Code Description
00 0 mitoses per square millimeter (mm)
Mitoses absent
No mitoses present
01-99 1 - 99 mitoses/square mm
(Exact measurement in mitoses/square mm)
X1 100 mitoses/square mm or more
X2 Stated as "less than 1 mitosis/square mm"
Stated as "nonmitogenic"
X3 Stated as "at least 1 mitosis/square mm"
Stated as "mitogenic"
X4 Mitotic rate described with denominator other than square millimeter (mm)
X7 Test ordered, results not in chart
X8 Not applicable: Information not collected for this case
(If this information is required by your standard setter, use of code X8 may result in an edit error.)
X9 Not documented in medical record
Mitotic Rate Melanoma not assessed or unknown if assessed