Malnutrition Coding and Reimbursement: How Documentation Practice Shapes Reported Prevalence
DOI:
https://doi.org/10.5281/zenodo.22303793Keywords:
Malnutrition, Clinical coding, Reimbursement, Administrative data, Prevalence estimationAbstract
Reported hospital malnutrition prevalence is produced by documentation practice as much as by patients. Coded diagnoses
appeared in 8.9 per cent of United States non-maternal, non-neonatal discharges in 2018, while screening studies in acute settings
report 12 to 53 per cent. A single-centre audit identified 1,817 patients as malnourished over two years and found 64.4 per cent of
them carried no malnutrition code. The gap is well described and the usual conclusion is that coding should improve. The
complication lies in what happens when it does. Between 2016 and 2018 codes for any malnutrition rose from 6.6 to 8.6 per cent
and for severe malnutrition from 3.3 to 4.7 per cent, while the adjusted death rate among those coded with severe malnutrition fell
by 0.54 per cent per year, a decline absent in those without a code. Falling mortality among the coded is what a lowered coding
threshold looks like. Reported prevalence therefore cannot serve simultaneously as an epidemiological estimate and as a billing
artefact, and the literature measuring coding improvement reports revenue far more often than it reports patient outcomes.
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