Tabular List of inclusions and four-character subcategories (VAS)
The Tabular List of inclusions and four-character subcategories ("Vierstellige ausführliche Systematik" VAS) is the core of ICD-10-WHO. It contains all three- and four-character categories, subclassifications on the formation of five-character categories as well as all definitions, inclusions and exclusions and other notes, etc.
List of three-character categories (DAS)
The List of three-character categories ("Dreistellige allgemeine Systematik" DAS) is an excerpt from the Tabular List of inclusions and four-character subcategories (VAS). Because only the three-character codes are mandatory for reporting on an international level, the DAS of ICD-10-WHO, in addition to chapter and group titles contains all three-character categories only with code and class title, without subcategories or reference notes.
Morphology of neoplasms in ICD-O-3
For the histological classification, the nomenclature of the "Morphology of neoplasms" of ICD-O-3 can be used together with the topographical keys in "Chapter II Neoplasms" of ICD-10-WHO. Morphology codes are five-digit number sequences. The first four digits denote the histological type of the neoplasm, the fifth digit is separated by a forward slash and indicates the malignancy grade.
Crosswalks and metadata
Two additional machine-readable files are published for the systematic index, namely metadata and crosswalk.
Metadata contain certain additional information on individual codes.
Crosswalk tables match the codes of two successive versions of the classification, in answer to the question: which code of a new version of ICD-10-WHO corresponds to a certain code of a previous version and vice versa?
Metadata of ICD-10-WHO
Metadata for ICD-10-WHO contain certain additional information on each ICD-10-WHO code that permit certain plausibility tests and statistical grouping also in accordance with ICD-10-WHO special tabulation lists. Metadata in machine-readable form are available only in German language from Downloads classification in the subfolder "Metadaten und Überleitung" (Metadata and Crosswalks) in the version for the respective year.
Scope and possible applications of the metadata
The metadata are an enhanced excerpt from the Tabular List of inclusions and four-character subcategories (VAS) of ICD-10-WHO. The data include all three- and four-character codes with class titles as well as block and chapter titles. Five-character codes are optional and thus not included. The data are correlated to the special list for the tabulation of mortality and morbidity in the appendix to the ICD-10-WHO Tabular List. (mortality lists, morbidity lists).
In addition, metadata contain information on the gender and age relation of individual codes. In each case, it is stipulated whether violations of the gender or age relation are to be treated as an optional or a mandatory error. Furthermore, there is a special mark for diseases that are rare in Central Europe (known as "exotic diseases"). They are always to be treated as an optional error.
The metadata allow you to
- decode codes,
- group codes for statistics in accordance with blocks or chapters or with ICD-10-WHO special tabulation lists,
- check codes for formal correctness and
- check codes against gender and age of patients.
By themselves, these metadata are not suitable for the development of encoding software, because important parts of ICD-10-WHO are missing. Useful work with the classification is not possible without the class attributes of inclusion notes and exclusionnotes and notes on individual codes.
Crosswalks of ICD
The BfArM crosswalk tables match the codes of two successive versions of the classification, in answer to the question: which code of a new version of ICD-10 corresponds to a certain code of a previous version and vice versa. The crosswalk tables are only available in German language from Downloads classifications, subfolder "Metadaten und Überleitung" (Metadata and crosswalk) for the respective version.
Possible applications for classificatory crosswalks
Crosswalks between two classifications or two versions of one classification are always determined by their purpose. A crosswalk for epidemiological timelines looks different from a crosswalk for economic mapping for DRG systems.
The BfArM crosswalks are pure classificatory crosswalks; each code from one version is to be mapped to the code of another version to ensure that the contents of one code are reflected in the other. Such a classificatory crosswalk does not take into account different frequencies or different costs of the diagnoses subsumed under a particular code.
The crosswalk tables make it possible to transcode encoded data to the codes of another version of the classification. Crosswalk tables thus support the continuation of statistical surveys across a version change (timelines).
ICD crosswalk tables
BfArM provides ICD crosswalk tables between different versions of ICD-10-GM (SGB-V), between ICD-10-WHO versions and a crosswalk table between ICD-9-WHO 6.0 and ICD-10-WHO 1.3 revisions. The crosswalk tables are available from Downloads classifications in the subfolder for the respective target version.
Structure of the crosswalk tables
The crosswalk tables consist of three lists:
- list of (old) codes of the source version with associated class titles (in German language)
- list of (new) codes of the target version with associated class titles (in German language)
- list of paired source and target codes
In addition to the code pairs "old code" - "new code", there are also two further columns with information whether the crosswalk from old to new or vice versa can be done automatically or has to be performed manually. The latter is the case, for example, if code differentiation has resulted in more than one target code being available for a source code.
Crosswalk from ICD-9 to ICD-10-WHO
The crosswalk from ICD-9-WHO to ICD-10-WHO is done with the help of the crosswalk table between ICD-9-WHO 6.0 and ICD-10-WHO 1.3, available from Downloads classifications in the folder for the target version 1.3 of ICD-10-WHO.
Crosswalk from ICD-9 to ICD-10-SGB-V
There is no crosswalk from ICD-9 to the SGB-V version of ICD-10.
There are only minor differences between ICD-10-SGB-V version 1.3 and ICD-10-WHO version 1.3: The simplified ICD-10-SGB-V contains only three-character codes for diagnoses that are rare in Central Europe (such as plague: A20.-); the four-character codes have been removed from the systematic index and listed in an appendix. Chapters XX and XXI only include codes required for the purposes of SGB-V.
For that reason, you can proceed as follows:
- Crosswalk of ICD-9 codes to the codes of ICD-10-WHO version 1.3
- Check whether this crosswalk involved codes that are no longer included in the SGB-V version: Has the crosswalk involved codes that have been removed from the SGB-V version in the appendix for diagnoses that are rare in Central Europe or codes omitted from Chapters XX and XXI? Crosswalks to such codes require correction and manual assignment to remaining three-character codes of rare diagnoses or appropriate codes for the SGB-V version.
- After this process, codes originally encoded in accordance with ICD-9 are now available as ICD-10-SGB-V of version 1.3.