title: Conversion problems concerning automated mapping from ICD-10 to ICD-9.
abstract: The increasing parallel use of ICD-9 and ICD-10 complicates the comparability of coded diagnoses. This is the reason why we developed a symmetric table for interactive conversion between ICD-9 and ICD-10, based on a vector space text-retrieval method that resulted in unambiguous mapping from ICD-9 to ICD-10 in 64%, from ICD-10 to ICD-9 in 87% of all three- and four-character classes of the tabular list. Out of the remaining 13% of multi-valued relations, a table for automated mapping from ICD-10 to ICD-9 was created. In 9% of cases, the selection offered no problems. A compromise between preserving information content and maintaining the logical integrity had to be found in 2.4%; in 1.6% automated mapping was impossible because of newly defined concepts and structural differences between ICD-9 and ICD-10 that are not counterbalanced by a consistent system of residual categories. We recommend that in a future revision of the ICD, compatibility with the then existing classification system should be considered.
authors.affiliation: Department of Medical Informatics, University of Freiburg, Germany. stschulz@uni-freiburg.de
authors.forename: S
authors.initials: S
authors.lastname: Schulz
authors.forename: A
authors.initials: A
authors.lastname: Zaiss
authors.forename: R
authors.initials: R
authors.lastname: Brunner
authors.forename: D
authors.initials: D
authors.lastname: Spinner
authors.forename: R
authors.initials: R
authors.lastname: Klar
mesh_terms: D003936:Diagnosis, Computer-Assisted; D003937:Diagnosis, Differential; D004194:Disease / Q000145:classification*; D006801:Humans; D012984:Software; D009626:Terminology as Topic