“Over the period 2012–2022, the percentage of people with outpatient diagnoses of mental disorders rose from 33.4% to 37.9% (a relative increase of 13.4%).” “Contextualizing research is needed for a better understanding of these developments.” “The interpretation of trends in diagnostic prevalence is challenging because several factors may affect them, including changes in the prevalence of mental disorders, healthcare-seeking behaviour, diagnostic practices and documentation routines, as well as structural changes in the healthcare system.”

Using nationwide outpatient claims data of all statutorily insured individuals in Germany for the years 2012–2022, the study found: "Over the period 2012–2022, the percentage of people with outpatient diagnoses of mental disorders rose from 33.4% to 37.9% (a relative increase of 13.4%)." It concludes that "Trends in diagnostic prevalence differ across mental disorders and population subgroups" and states that "Contextualizing research is needed for a better understanding of these developments," without attributing the increase primarily to previously untreated or unrecorded cases becoming visible due to increased help‑seeking.

Between 2012 and 2024, the administrative prevalence of mental disorders in German outpatient care increased from 35.0 % to 40.9 % among adults.[5] The RKI explicitly notes: "As causes of the development it is discussed that people increasingly make use of help due to mental disorders, also in the course of their destigmatization." ("Als Ursachen der Entwicklung wird diskutiert, dass Personen zunehmend Hilfe aufgrund psychischer Störungen in Anspruch nehmen, auch im Zuge ihrer Entstigmatisierung.")[5] This passage frames increased help‑seeking and reduced stigma as *one* discussed cause of rising diagnoses, but does not claim it is the sole or predominant cause.[5]

Using nationwide outpatient billing data from statutory health insurance, Thom et al. report: "From 2012 to 2022 the proportion of persons with outpatient diagnoses of mental disorders increased from 33.4 % to 37.9 % (+13.4 %)."[1][9] In the discussion, the authors state that reasons for increased diagnosis prevalence may include changes in health care utilization, diagnostic and coding practices, demographic changes, and effects of the COVID‑19 pandemic; they do not quantify the share attributable to newly visible, previously untreated cases.[9] The conclusion emphasizes that trends differ by disorder group and population subgroup and have changed in some diagnoses since the COVID‑19 pandemic.[1][9]

“Since 2012, the administrative prevalence of mental disorders has continued to rise almost every year.” “Possible explanations for this development include that people may be increasingly seeking help for mental disorders, also due to their destigmatisation. In addition, changes in diagnostic practices, documentation routines and the healthcare system may also play a role.” “In 2024, 40.9% of adults in Germany were diagnosed with a mental disorder in outpatient care… Over time, the administrative prevalence of mental disorders increased between 2012 (35.0%) and 2024.”

“Objectives: To describe the prevalence and distribution of perceived need for mental healthcare among adults in Germany and examine its association with more objective indicators of need as well as mental health literacy.” “Results: Approximately one sixth of adults perceived a need for mental healthcare in the previous 12 months.” “Those with perceived need were also twice as likely to have a documented F-diagnosis than those without.” “Conclusions: Perceived need should be monitored within mental health surveillance to inform healthcare planning from a patient perspective and address the mental health treatment gap.”

The OECD’s Germany country health profile states that in 2019 "18% of the German population experienced a mental health condition, which is slightly higher than the EU average of 17%." It notes that outpatient care for people with mental health problems "is supported by a growing number of office‑based psychiatrists, neurologists and psychotherapists working in the ambulatory care sector," but that "long waiting times hinder availability" and there are large regional differences in ambulatory psychotherapeutic services. The report does not claim that increases in diagnoses are largely due to previously untreated or unrecorded problems becoming visible; rather it highlights capacity, access, and unmet need issues.

The Versorgungsatlas study on incidence trends for 37 mental disorders in adult outpatient care reports that in 2022 "7.5 of 60.9 million SHI‑insured adults received for the first time after two years free of diagnoses at least one mental or behavioral disorder diagnosis (F10–F99)."[2] It notes that previous secondary data analyses for 2012–2022 found an increase in overall diagnosis prevalence of mental disorders from 33 % to 38 % among SHI‑insured across all age groups, based on nationwide outpatient billing data from regional Associations of Statutory Health Insurance Physicians.[2] The paper discusses incidence (new validated diagnoses after a diagnosis‑free interval), which is more consistent with previously undiagnosed or unrecorded cases, but does not claim that increased help‑seeking is the main driver of the overall prevalence rise.[2]

The BARMER Arztreport 2023 states that diagnoses from chapter 05 'Mental and behavioural disorders' have been increasing for a number of years. The report is relevant because it tracks outpatient diagnosis trends in statutory health insurance data over time.

The report explains that from the 2008 survey year onward, outpatient diagnosis data were also used for morbidity-based allocation of financial resources among health insurers. It notes that causes should ideally be named in diagnoses, but external causes such as mobbing cannot be reliably verified in the ICD-coded data used here.

“The publications indicate a small but steady increase of mental and behavioural disorder diagnoses before the COVID-19 pandemic, which was followed by a general decrease in use of healthcare services and incidence numbers of most mental and behavioural disorders during the pandemic.” “Meanwhile, SHI agencies only recorded a small increase in applications for guideline-based psychotherapy of 4–6% during the COVID-19 pandemic.” “The latest studies from 2020 to 2022 suggest that every third to every fourth German child and adolescent suffers from clinically relevant mental health problems.”

A 2025 article in Bundesgesundheitsblatt on estimated incidences of mental disorders in SHI‑insured adults in Germany from 2006 to 2022 reports that incidence estimators for schizophrenia, schizotypal and delusional disorders show a clear decline over that period.[8] The study uses estimation methods to derive incidence measures from outpatient administrative data and shows heterogeneous trends across diagnostic groups; some disorders have increasing estimated incidence, others decreasing.[8] This heterogeneity suggests that multiple factors beyond just increased help‑seeking or visibility of a hidden burden influence outpatient diagnosis trends.[8]

“Developments in the national diagnostic prevalence of mental disorders 2012–2021 were analysed in collaboration with the Central Research Institute of Ambulatory Health Care in Germany (‘Zentralinstitut für die kassenärztliche Versorgung in Deutschland (Zi)’).” “A dashboard with monthly updates shows developments in the mental health of adults in Germany on the basis of continuously collected survey data.” “The aim of the MHS is to provide systematic and continuous reporting on a selection of core indicators of mental health in Germany’s population.”

The DGPPN "Basisdaten Psychische Erkrankungen" compilation cites Thom et al. (2024) and reports: "In 2023, 40.4 % of statutory-insured adults received a diagnosis of a mental disorder."[4] It also notes that per quarter about 2.3 million statutory-insured patients are treated by outpatient psychiatrists and neurologists and about 1.86 million patients receive psychotherapeutic services in outpatient practices, indicating extensive and growing service use.[4] While the report summarizes utilization and prevalence, it does not provide a quantified breakdown of how much of the increase in outpatient diagnoses is due to previously untreated cases becoming visible versus changes in diagnostic behavior or other structural factors.[4]

The report's model calculations found that somatoform disorders, reactions to severe stress, anxiety disorders, and hyperkinetic disorders were associated with a 1.5- to 2.4-fold increased probability of first contacts with psychotherapists. This is evidence that higher recorded diagnosis rates can be linked to care-seeking and contact with services, not just underlying disease incidence.

A 2025 review of mental health services in Germany reports structural trends relevant to interpreting diagnostic increases: "In 2022, there were 8,954 mental health specialist doctors practicing in outpatient settings in Germany" and between 2012 and 2022 "the number of [combined psychiatric and psychosomatic hospital] beds rose from 63,044 to 69,855," including a 5.7% increase in psychiatry/psychotherapy beds and a 41% increase in psychosomatic medicine beds. It notes that a reform of psychotherapy law "significantly increased the availability of psychotherapy services, with the number of reimbursed sessions rising by 41% between 2005 and 2021." The article discusses service expansion and system changes but does not state that the 2012–2022 increase in outpatient diagnoses was largely caused by previously untreated or unrecorded problems becoming visible; instead it describes multiple structural factors including capacity and policy changes.

“The present study examines trends in the prevalence of depressive symptoms among adults in Germany between 2008 and 2023 within the German Health Update (GEDA) and the Corona Monitoring Nationwide (COMo) studies.” “Across survey waves, the prevalence of moderately severe to severe depressive symptoms remained largely stable, with some fluctuations during the COVID-19 pandemic.” “The authors highlight that trends in symptom prevalence from surveys and trends in diagnostic prevalence from claims data need to be interpreted jointly, as they may reflect different aspects such as help-seeking and healthcare provision.”

The report says the frequency of depression diagnoses among young adults has steadily increased over the previous twelve years, after adjustment for demographic effects. It further reports that in model calculations, prior documentation of other mental disorder diagnoses was associated with a nearly threefold increased risk of a subsequent first recorded depression.

The WHO Mental Health Atlas 2020 country profile for Germany shows the organisation of services but also provides context on help‑seeking and service utilisation. It reports the number of visits made by service users in the last year in outpatient facilities and notes Germany’s relatively high service availability compared with many countries. However, the profile does not provide evidence that trends in outpatient diagnoses from 2012 to 2022 are largely due to previously untreated cases becoming visible; instead it frames data in terms of service capacity and utilisation at a single time point (around 2020).

The factsheet on psychology by Aufklaren Hamburg states that in Germany "about 27.8 % of the adult population are affected by a mental disorder each year" (approx. 17.8 million people), yet "only 18.9 % per year make contact with service providers".[3] This illustrates a substantial treatment gap and a "dark figure" of untreated or unrecorded mental health problems; most people with disorders do not seek professional help in a given year.[3] The factsheet also notes evidence from billing data of a pandemic‑related increase in psychological stress in Germany, but it does not attribute changes in outpatient diagnosis prevalence primarily to previously untreated cases becoming visible.[3]

The article states that the increase in diagnoses of mental disorders from 2012 onward has been discussed as possibly reflecting increased help-seeking due to destigmatization. It also notes that the rise in administrative prevalence is not explained uniformly by new cases, and may instead reflect longer durations of diagnosis and treatment.

In a 2025 presentation "Psychische Gesundheit der Bevölkerung – Aktuelle Lage", J. Thom shows that administrative prevalence of outpatient mental disorder diagnoses in adults rose from 35.0 % to 40.4 % over the observation period.[7] The slides indicate that increases in outpatient diagnoses of anxiety disorders and depression are mainly observed in young adults, while trends differ by age and disorder group.[7] The presentation describes prevalence and subgroup patterns but does not explicitly state that the increase is largely due to previously untreated mental health problems becoming visible through greater help‑seeking; instead, it mentions utilization and coding changes among the possible explanatory factors.[7]

A 2026 press release by Destatis reports on inpatient treatments: "In the 20‑year comparison, the number of treatments due to mental illnesses has increased in almost all age groups, most strongly among 10‑ to 19‑year‑olds: in 2024 there were 36.5 % more mentally ill children and adolescents in inpatient treatment than in 2004."[6] Regarding 2024, it notes that mental illnesses and behavioral disorders accounted for 18.9 % of all hospital treatments, and that overall the number of treatments due to these diagnoses increased by 4.0 % from 2004 to 2024.[6] The press release shows medium‑term increases in hospitalizations for mental disorders, but does not analyse whether this rise is mainly due to previously untreated problems becoming visible versus changes in diagnostic or admission practices.[6]

An article on outpatient mental health care in Germany during high‑incidence phases of the COVID‑19 pandemic examines changes in service utilisation, including the use of telemedicine, rather than long‑term 2012–2022 trends. The survey describes that many providers observed shifts in demand and mode of delivery during the pandemic, and some reported increased help‑seeking among certain groups. However, it does not claim that the broader decade‑long increase in outpatient diagnoses was largely caused by previously untreated or unrecorded cases becoming visible; its focus is on short‑term pandemic‑related utilisation changes.

German and international literature on diagnostic prevalence repeatedly points out that increases in recorded mental disorder diagnoses can be due to multiple mechanisms: a real rise in mental health problems, greater awareness and reduced stigma, increased help-seeking, changes in reimbursement and coding incentives, and shifts in clinical diagnostic practices. Claims data-based surveillance systems such as those at the Robert Koch Institute are often contrasted with survey-based symptom prevalence studies to disentangle whether higher diagnosis rates primarily reflect more care utilization or a true change in underlying morbidity.