Objectives: As part of the quality assurance of inpatient treatment, the severity of the disease and the course of therapy must be mapped. However, there is a high degree of heterogeneity in the implementation of basic diagnostics in psychosomatic facilities.There is a lack of scientifically based standardisation in determining the quality of outcomes. Methods: With the help of scientifically established test instruments, a resource-saving basic documentation instrument was developed. Many existing psychometric instruments were checked for test quality, costs and computer-supported application. Results: The Psychosomatic Health Inventory (gi-ps) consists of three basic modules with a total of 63 items: sociodemography, screening and psychosomatic health status.The latter is represented bymeans of construct-based recording on eight scales. Its collection at admission and discharge allows the presentation of the quality of outcomes.The development of a proprietary software solution with LimeSurvey enables the computer-based collection, evaluation, and storage of data. A list of test inventories for confirming diagnoses and predictors has been compiled, which are recommended for use in clinical routine. Discussion: With the gi-ps, a modular basic documentation instrument including the software solution is available to all interested institutions free of charge.