You can access the classifications in various formats in the German rubric Klassifikationen - Downloads.

With the download of the files, a license agreement originates between yourself and the German Institute of Medical Documentation and Information (DIMDI). The English translation is for your convenience only. As this license agreement is subject to German law you will have to accept the German version for downloading the files. As a result, you undertake to comply with our terms of distribution.

Terms of distribution for ICD-10-GM, OPS, ICD-10-WHO and Alpha-ID (PDF, 300 kB)

Further licensing information about ICD-10,  ICD-O and ICF you will find here at WHO:

Licensing WHO classifications

 If you have any problems, please contact Classifications via contact form.