biostudies-literatureUnknown20(10)Varghese J<h4>Background</h4>Medical coding is essential for standardized communication and integration of clinical data. The Unified Medical Language System by the National Library of Medicine is the largest clinical terminology system for medical coders and Natural Language Processing tools. However, the abundance of ambiguous codes leads to low rates of uniform coding among different coders.<h4>Objective</h4>The objective of our study was to measure uniform coding among different medical experts in terms of interrater reliability and analyze the effect on interrater reliability using an expert- and Web-based code suggestion system.<h4>Methods</h4>We conducted a quasi-experimental study in which 6 medical experts coded 602 medical items from structured quality assurance forms or free-text eligibilJournal of medical Internet researche274https://www.ebi.ac.uk/biostudies/studies/S-EPMC6231825biostudies-literatureWeb-Based Information Infrastructure Increases the Interrater Reliability of Medical Coders: Quasi-Experimental Study.PMC6231825Dugas MSandmann SVarghese JfalseWeb-Based Information Infrastructure Increases the Interrater Reliability of Medical Coders: Quasi-Experimental Study.<h4>Background</h4>Medical coding is essential for standardized communication and integration of clinical data. The Unified Medical Language System by the National Library of Medicine is the largest clinical terminology system for medical coders and Natural Language Processing tools. However, the abundance of ambiguous codes leads to low rates of uniform coding among different coders.<h4>Objective</h4>The objective of our study was to measure uniform coding among different medical experts in terms of interrater reliability and analyze the effect on interrater reliability using an expert- and Web-based code suggestion system.<h4>Methods</h4>We conducted a quasi-experimental study in which 6 medical experts coded 602 medical items from structured quality assurance forms or free-text eligibil2018-01-01T00:00:00Z2018 Oct2025-04-18T21:17:32.197Z2019-10-19T07:07:25ZS-EPMC62318253032283410.2196/jmir.9644