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This paper is a study of patient notes from an emergency department and a determination of their consistency for correct SNOMED CT encoding of the diagnosis, and comparison with a clinical language processing (CLP) system that determined the SCT diagnoses. Three set of notes were reviewed by a clinician with 500 records in each where: the clinician and CLP codes where the same (Matched Set); where they were different (Unmatched Set); and, where the clinicians had failed to enter a code (Unassigned Set) giving accuracies of 75%, 33.4% and 44.9% respectively.