The morphology code records the type of cell that has become neoplastic and its biologic activity; in other words, it records the kind of tumor that has developed and how it behaves.

What is the correct format for morphology codes?

Morphology terms have five-digit codes ranging from M-8000/0 to M-9989/3. The first four digits indicate the specific histologic term (Figure 8). The fifth digit, after the slash or solidus (/), is a behavior code, which indicates whether a tumor is malignant, benign, in situ, or uncertain whether malignant or benign.

What is morphology in Oncology?

Definition: The morphology of a cancer refers to the histological classification of the cancer tissue (histopathological type) and a description of the course of development that a tumour is likely to take: benign or malignant (behaviour).