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International Classification of Diseases Code (ICD)

Definition
AI-generated

ICD codes are standardized diagnosis and health-state labels published by the World Health Organization—commonly ICD-9-CM, ICD-10, or ICD-11 in clinical and claims data.

Topics
Cohorts and databases
Synonyms
ICD (not “IDC,” a frequent typo)
Related
Case-Control Study Cohort PheCode

Why it matters in GWAS

Mis-mapping ICD revisions, secondary versus primary position, or local coding practice biases case ascertainment; multi-site meta-analyses require harmonization rules and sometimes country-specific variants.

Example usage

"We required at least two ICD-10 E11 entries separated by 30 days to define type 2 diabetes cases."

Case-Control Study Cohort PheCode Phenome-Wide Association Study (PheWAS) Phenotype
Related-term network

Click any node to open that term page.

Node order. The current term is first. Next come every page linked from Related terms, in the same top-to-bottom order as that list. Then new terms appear in two-hop layers: for each of those direct neighbors (in that same order), their related terms are appended if not already listed. A third pass does the same for two-hop nodes. The walk stops when a fixed maximum number of nodes is reached.

References

  • World Health Organization. International Classification of Diseases (ICD). https://www.who.int/standards/classifications/classification-of-diseases
← IBS0 Identity by Descent (IBD) →

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