Which statement is true about ICD-10 and ICD-O-3?

• A. ICD-10 for mortality; ICD-O-3 for neoplasms
• B. ICD-10 codes neoplasms; ICD-O-3 codes all diseases
• C. ICD-10 is alphanumeric; ICD-O-3 numeric
• D. ICD-10 uses 5-digit codes; ICD-O-3 uses 6-digit codes

Answer: (A)

This item tests how ICD-10 and ICD-O-3 are used in cancer data. ICD-10 is the general coding system used to record diagnoses and causes of death on death certificates and medical records, covering a wide range of diseases, including cancer. ICD-O-3, on the other hand, is a specialized oncology coding system used primarily by cancer registries to classify tumors by site and morphology, not for coding all diseases. Because one system serves broad mortality and morbidity coding and the other provides detailed tumor-specific coding, the statement that ICD-10 is used for mortality and ICD-O-3 for neoplasms is true. The other options are inaccurate because ICD-10 does more than just mortality, ICD-O-3 is not for all diseases, and the coding formats differ in structure rather than simply being a fixed 5- or 6-digit scheme.