Published in 1976 after physicians expressed a desire for morphology codes: which ICD-O edition?

Published in 1976 after physicians expressed a desire for morphology codes: which ICD-O edition?

• A. ICD-O second edition
• B. ICD-O third edition
• C. ICD-O first edition
• D. ICD-O fourth edition

Answer: (C)

Morphology coding was added to ICD-O to capture the histologic type of tumors in addition to their location. Published in 1976 after physicians expressed a need for detailed morphology codes, this first edition established the combined system of site (topography) and morphology codes. It gave registries a standardized way to describe what the cancer cells look like, not just where the cancer is in the body, using specific four-digit histology codes (with a behavior indicator) to distinguish malignant, benign, in situ, and other categories. This breakthrough made national and international cancer data more comparable and meaningful. Later editions refined and expanded the codes, but the 1976 publication marks the introduction of morphology coding in ICD-O.

Morphology coding was added to ICD-O to capture the histologic type of tumors in addition to their location. Published in 1976 after physicians expressed a need for detailed morphology codes, this first edition established the combined system of site (topography) and morphology codes. It gave registries a standardized way to describe what the cancer cells look like, not just where the cancer is in the body, using specific four-digit histology codes (with a behavior indicator) to distinguish malignant, benign, in situ, and other categories. This breakthrough made national and international cancer data more comparable and meaningful. Later editions refined and expanded the codes, but the 1976 publication marks the introduction of morphology coding in ICD-O.