Understanding the High Prevalence of Low-Prevalence Chronic Disease Combinations: Databases and Methods for Research. World Health Organization Grouper System


International Shortlist for Hospital Morbidity Tabulation (ISHMT)


1 OECD Health Data 2012 – Definitions, Sources and Methods. International Shortlist for Hospital Morbidity Tabulation (ISHMT). http://apps.who.int/classifications/apps/icd/implementation/hospitaldischarge.htm

2 Wong A, Boshuizen HC, Schellevis FG, et al. Longitudinal Administrative Data Can Be Used to Examine Multimorbidity, provided false discoveries are controlled for. J Clin Epidemiol. 201; 64(10)1109–17.

Sponsorship: World Health Organization
Description: The Hospital Data Project (HDP) of the European Union Health Monitoring Programme convened an Expert Group to create a “shortlist” of clinical conditions that could be monitored across countries based on the special tabulation list for morbidity published in ICD-10 volume one. The special tabulation list grouped diagnosis codes into 298 categories, so that these categories could be compared across hospitals world-wide. However, this list was regarded to be extensive and difficult to use for analytical purposes. Therefore, the International Shortlist for Hospital Morbidity Tabulation (ISHMT) was created and represents a subset (130) of the original 298 categories.
Purpose/Use: The purpose of the ISHMT is to provide a means by which to compare hospital morbidity statistics across hospitals world- wide in a manner that maximizes statistical comparability and efficiency.1
Coding Family: ICD-9 & ICD-10
Grouping Methodology:

Select diagnoses codes are grouped into one of 130 ISHMT categories. The 130 categories are comprised of:

  1. 98 specific disease groups (41 are single-code groups).
  2. 14 subchapter remainder groups to allow meaningful subchapter summations ( e.g., malignant neoplasms, ischemic heart disease, diseases of liver).
  3. 17 chapter remainder groups to allow summation at chapter level.
  4. 1 group that includes cases with invalid codes or without a diagnosis.

This grouping system is hierarchical and can be collapsed into ICD-10 chapters.

Level of Diagnosis Aggregation: Diagnoses are grouped into 130 categories.
Number of Codes Included: Not specified
Number of Codes Excluded: Not specified
Methodological Considerations: This grouping system provides a means by which to compare hospital morbidity statistics across hospitals world-wide in a manner that maximizes statistical comparability. However, this grouping system represents only a subset of the clinical conditions that were identified based upon expert consensus. In addition, differences in diagnostic cultures and coding practices among countries are a general limitation of this grouping system.
Related Data Sources: Claims data
Used in Disease Complexity Research: Yes2


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