ISO 13120:2013
Subscribe to updates

Health informatics -- Syntax to represent the content of healthcare classification systems -- Classification Markup Language (ClaML)


The main purpose of ISO 13120:2013 is to formally represent the content and hierarchical structure of healthcare classification systems in a markup language for the safe exchange and distribution of data and structure between organizations and dissimilar software products.

The scope of healthcare classifications systems covered in ISO 13120:2013 encompasses terminologies, and is constrained to traditional paper-based systems (like ICD-10) and systems built according to categorial structures and a cross thesaurus (like ICNP). ISO 13120:2013 is intended for representation of healthcare classification systems in which classes have textual definitions, hierarchical ordering, named hierarchical levels (such as "chapter", "section"), inclusion- and exclusion criteria, and codes. It is not intended to cover any formal representation, either for definition or composition, of concepts, or for specification of classification rules. Systems with such formal specifications can at best be partially represented using ISO 13120:2013, and are hence out of scope.

ISO 13120:2013 is not intended to:

  1. provide a normative syntax on how a healthcare classification system is to be constructed;
  2. define link types between elements in a healthcare classification system; this is left to the developers of healthcare classification systems;
  3. provide a representation for direct viewing or printing.


  • Document published on: 2013-04
    Edition: 1 (Monolingual) ICS: 35.240.80
    Status: Published Stage: 90.92 (2015-06-02)
    TC/SC: ISO/TC 215 Number of Pages: 37
  • Revised by: ISO/CD 13120

  • No corrigenda or amendments available

Related standards

  • PDF

    This format preserves the paper layout, and is watermarked

  • EPUB

    This format allows documents to be read on tablets and smartphones


    Enhanced user-friendly colour PDF format


    See any updates made from previous versions at a glance


    Normally A4 size documents. Shipping costs apply



PDF + ePub

Swiss francs CHF 158


Got a question?

Check out our FAQs

Email Customer Care
or call us on +41 22 749 08 88
09:00 – 12:00, 14:00 – 17:00 (UTC+1).