Objective: In Germany, patients with mental disorders can benefit from many medical and non-medical services. However, assessing the consumption of these services is difficult. We developed the questionnaire FIMPsy that can be used to assess health care consumption in patients with mental disorders and thereby facilitate economic evaluations. Methods: We identified relevant medical and non-medical services for patients with mental disorders and included frequently consumed services in the questionnaire. Results: FIMPsy can be utilized to assess the consumption of the following services in the preceding six months retrospectively: informal care, psychiatric counselling, psychosocial care, assisted living and occupational integration. Furthermore, FIMPsy assesses contacts with outpatient and inpatient medical providers as well as the intake of medication. Conclusion: FIMPsy covers many services for patients with mental disorders. It can be applied in economic evaluations and thus facilitate and standardize their implementation.