Coding & Classification Systems Flashcards

When a patient has two simultaneous primary tumors in the same organ, which rule governs whether they are reported as one or two cases?

Answer: Multiple primary rules (e.g., SEER MPH rules)

SEER Multiple Primary and Histology (MPH) rules determine whether simultaneous tumors in the same organ constitute one or two reportable primaries.

Which ICD-O-3 grade code is assigned when the pathology report states 'poorly differentiated'?

Answer: Grade III

Grade III (poorly differentiated) corresponds to high-grade tumors with significantly abnormal cell appearance.

The Collaborative Stage (CS) data collection system was retired and replaced by which system beginning with cases diagnosed in 2016?

Answer: EOD (Extent of Disease) 2018

Extent of Disease (EOD) 2018 replaced Collaborative Stage for cases diagnosed on or after January 1, 2018.

Under ICD-O-3 topography coding, C76.0 represents which primary site?

Answer: Head, face, and neck, NOS

C76.0 in ICD-O-3 designates the head, face, and neck as a primary site when a more specific subsite cannot be determined.

Which histologic type does ICD-O-3 code 9732/3 represent?

Answer: Multiple myeloma

ICD-O-3 code 9732/3 represents multiple myeloma (plasma cell myeloma).

When the pathology report lists 'infiltrating duct carcinoma' for a breast tumor, which ICD-O-3 histology code should the registrar assign?

Answer: 8500/3

Infiltrating duct carcinoma (invasive ductal carcinoma, NOS) is coded 8500/3 in ICD-O-3.

In AJCC 8th edition staging for colorectal cancer, which N category indicates metastasis in 7 or more regional lymph nodes?

Answer: N2b

N2b in AJCC 8th edition colorectal staging indicates metastasis in 7 or more regional lymph nodes.