ICD

In Germany, codes of the International Classification of Diseases 10th Revision - German Modification (ICD-10-GM) of the World Health Organization (WHO) are used as diagnosis codes - in the GPDS, the scope of the diagnoses is examplatory limited to affective disorders. In ICD-10, that specific disease group is defined as the following codes: F30-F39.

In the DSM-5 used in the USA, there is no numbering of the disorders, but each diagnosis can be assigned an ICD code. As ICD-10 is primarily used for billing purposes and therefore has a limitation in so-called billing classifications, ICF and SNOMED CT come to the fore for correct coding and should be included. Especially against the background that a billing bias should be excluded when using secondary data. SNOMED CT is therefore a clear favorite for the inclusion of diagnosis codes for research, also due to its ontological properties.

In addition to ICD-10, there is also ICD-11, which is the newer version of the International Classification of Diseases terminology. ICD-11 includes a greater number of codes compared to ICD-10, allowing for more detailed and specific documentation of diseases, conditions, and related health issues. There are approx. 55,000 in ICD-11 vs. approx. 14,400 in ICD-10.

It also introduces significant improvements in areas such as mental health, where new categories and definitions provide a clearer and more clinically relevant framework for diagnoses. These updates make ICD-11 a more precise and user-friendly tool for global health reporting and decision-making.

The instruments used for the examination cannot be coded in ICD.