The ICD-10-WHO online version is compiled from approx. 300 single files which are inter-linked extensively to ensure comfortable navigation. The integrated code-search enables fast location of the code you are looking for.
The ICD-10-WHO online version is only available in German language.
Textsearch can be accessed via the hot keys ctrg+f. If you want to search the whole classification you can do so with the DIMDI-Websitesearch.
If you like this way to read ICD, you can transfer the files to your computer and use them offline: Downloads ICD-10-WHO (in German language).