Hierarchies

Medical code hierarchies classify health-related information like diseases, laboratory tests, and medical products.

They standardize the categorization of clinical information across different healthcare settings.

The hierarchies serve as universal languages in healthcare, facilitating accurate communication in clinical operations, billing processes, and research.

ICD, LOINC, and RxNorm Hierarchies

ICD Hierarchy

The relationship between International Classification of Diseases (ICD) coding system and Phecode system.

LOINC Hierarchy

A standardized coding system used globally to report laboratory and other clinical observations.

RxNorm Hierarchy

Hierarchical structure of medications and variants in brand and dosage form denoted in RxNorm systems.

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Introduction

ICD: The International Classification of Diseases (ICD) is a standardized system used to code causes of death (mortality) data from death certificates.


LOINC: a common language (set of identifiers, names, and codes) for identifying health measurements, observations, and documents.


RxNorm: provides normalized names for clinical drugs and links its names to many of the drug vocabularies commonly used in pharmacy management and drug interaction software.