Rule E.

Historical Background | Differences between ICD-O & ICD-10 | ICD-O Structure & Format |
Coding Guidelines | Multiple Primary Neoplasms | Coding Exercises | References |

Topography Codes for Leukemias

Coding Rules | Topography | Rule A | Rule B | Rule C | Rule D | Rule E | Morphology | Rule F | Rule G | Rule H |
Rule J | Rule K | Unit Review and Quiz |

Rule E. Topography code for leukemia: Code all leukemias except myeloid sarcoma (M-9930/3) to C42.1 (bone marrow).

Myeloid sarcoma is a leukemic deposit in an organ or tissue and should be coded to the site of origin.