ICD-O-3

Important

These modules are archived and should only be referenced for historical purposes.

The ICD-O-3 module provides a comprehensive training of the International Classification of Diseases for Oncology, Third Edition (ICD-O-3). You will learn about ICD-O-3 implementation, changes and the significance of these changes in the new edition, training issues, and casefinding lists.

After completing this training module, you will be able to

  • Describe the major events and activities regarding implementation of ICD-O-3.
  • Identify the major areas of changes in ICD-O-3.
  • Use the ICD-O-3 as a new neoplasm coding reference source.
  • Use the ICD-O-3 correctly and efficiently.

Suggested Citation

SEER Training Modules: ICD-O-3. U.S. National Institutes of Health, National Cancer Institute. Cited 02 January 2026. Available from: https://training.seer.cancer.gov.