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Accuracy of ICD-9 codes in identifying patients with peptic ulcer and gastrointestinal hemorrhage in the regional healthcare administrative database of Umbria
Orso M,
Abraha I,
Mengoni A,
Taborchi F,
De Giorgi M,
et al.
(2020)
Accuracy of ICD-9 codes in identifying patients with peptic ulcer and gastrointestinal hemorrhage in the regional healthcare administrative database of Umbria.
PLOS ONE 15(7): e0235714.
https://doi.org/10.1371/journal.pone.0235714