Introduction

Gastrointestinal Endoscopy (GIE) procedures are performed for a variety of reasons, including to screen individuals who are potentially at risk for colorectal cancer (CRC) or other gastrointestinal cancers, and to diagnose and monitor individuals who have gastrointestinal conditions such as inflammatory bowel disease (IBD).

In Lix et al. (2021), they investigated GIE procedures in Manitoba with an aim to provide insights about the patient, physician, and procedure characteristics associated with trends in utilization, wait times, and procedure outcomes.

Sub-groups of the primary study cohort (all individuals with at least one tariff code for a Gastrointestinal Endoscopy (GIE) procedure ) were identified and used in a variety of analyses. The sub-groups included: 1) Inflammatory Bowel Disease (IBD) sub-group, 2) Colorectal Cancer (CRC) sub-group, 3) IBD and CRC sub-group, 4) Upper Gastrointestinal Cancer sub-group, 5) Negative Colonoscopy sub-group, and 6) Polyp sub-group. For more information about the study sub-groups, see the section titled Study Cohorts in the on-line report.

This concept describes how the study identified Colorectal Cancer (CRC) and Upper Gastrointestinal Cancer for two of the sub-groups mentioned above.

Data Sources

The data source used to identify colorectal cancer (CRC) and upper gastrointestinal cancer is the Manitoba Cancer Registry data.

Diagnosis Codes

The following is a list of ICD-9-CM and ICD-10-CA codes used to identify colorectal cancers and upper gastrointestinal cancers for sub-groups that were investigated in Lix et al. (2021).

NOTE: The list of these codes can be found on-line in Appendix 3: Appendix Table 3.3 Diagnosis Codes to Identify Colorectal Cancer and Upper Gastrointestinal Cancer Sub-Groups of the deliverable.

Colorectal Cancer (CRC) Diagnosis Codes

Description	ICD-9-CM	ICD-10-CA
Caecum	153.4	C18.0
Ascending colon	153.6	C18.2
Hepatic flexure	153.0	C18.3
Transverse colon	153.1	C18.4
Splenic flexure	153.7	C18.5
Descending colon	153.2	C18.6
Sigmoid colon	153.3	C18.7
Rectosigmoid	154.0	C19
Rectum	154.1	C20
Colon, unspecified	153.9	C18.9
Other specified sites	153.8	N/A
Overlapping lesion of colon	N/A	C18.8
Intestinal tract, part unspecified	159.0	C26.0

Upper Gastrointestinal Cancer Diagnosis Codes

Description	ICD-9-CM	ICD-10-CA
Gastric	151.*, except 151.0	C16.*, except C16.0
Esophageal	150.0	C15
Gastroesophageal	151.0	C16.0

NOTE: * includes all sub-codes.

Research Findings

For more information about the Colorectal Cancer sub-group, see Table 3.4 in the on-line report that describes the socio-demographic characteristics of the colorectal cancer sub-group in the first and last years of the study observation period.

For more information about the Upper Gastrointestinal Cancer sub-group, see Table 3.5 in the on-line report that describes the socio-demographic characteristics of the upper gastrointestinal cancer sub-group in the first and last years of the study observation period.

For more information on the findings from this research related to post-colonoscopy CRC diagnosis, please see Chapter 6: Post-Colonoscopy Colorectal Cancer Diagnosis in the on-line report.