When the Diagnosis Does Not Fit: Workplace Trauma, PTSD, and the Overuse of Adjustment Disorder

Workers’ compensation systems across Australia are seeing a dramatic increase in psychological injury claims. Safe Work Australia’s 2025 Key Work Health and Safety Statistics report revealed that serious mental health claims rose to 17,600 in 2023–24, representing 12% of all serious workers’ compensation claims and a 161% increase over the preceding decade (Safe Work Australia, 2025). Workers with psychological injuries spend a median of 35.7 weeks off work, nearly five times longer than those with physical injuries, and receive median compensation of $67,400 (Safe Work Australia, 2025).

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Within this landscape, one diagnostic pattern warrants close scrutiny. Many workers who present to treating psychologists through WorkCover and similar schemes carry an initial diagnosis of adjustment disorder, despite presenting with symptom profiles that are more consistent with post-traumatic stress disorder (PTSD) or, in some cases, complex PTSD. This article examines the clinical and systemic reasons for this diagnostic mismatch, the evidence base distinguishing workplace trauma responses from adjustment reactions, and the real-world consequences of underdiagnosing trauma in the workers’ compensation context.

What Is Adjustment Disorder, and Why Does It Get Overused?

Adjustment disorder is classified in the DSM-5-TR under Trauma- and Stressor-Related Disorders (American Psychiatric Association, 2022). It describes an emotional or behavioural response to an identifiable stressor that is out of proportion to what would typically be expected, developing within three months of the stressor and generally resolving within six months after the stressor or its consequences have ended.

Critically, adjustment disorder functions as a diagnosis of exclusion. The DSM-5-TR specifies that it should not be diagnosed if the symptom pattern meets criteria for another mental disorder (American Psychiatric Association, 2022). This means that if a person’s presentation meets the criteria for PTSD, major depressive disorder, or generalised anxiety disorder, adjustment disorder is the wrong diagnosis.

Despite this, research has consistently identified that adjustment disorder is used as a residual diagnostic category when clinicians are uncertain about the symptom profile, or when a more thorough assessment has not yet been completed (O’Donnell et al., 2016; Bachem & Casey, 2018). O’Donnell and colleagues noted in their longitudinal Australian study that adjustment disorder shares significant symptomatic overlap with PTSD, and that clinicians sometimes apply it as a holding diagnosis rather than undertaking the structured assessment needed to make a trauma-specific diagnosis.

Key Point: Adjustment disorder is a diagnosis of exclusion. If symptoms meet criteria for PTSD, major depressive disorder, or another mental disorder, adjustment disorder should not be diagnosed (American Psychiatric Association, 2022).

What Constitutes Workplace Trauma?

The DSM-5-TR Criterion A Definition

The DSM-5-TR defines a traumatic event (Criterion A) as exposure to actual or threatened death, serious injury, or sexual violence, experienced directly, witnessed in person, learned about in relation to a close other, or through repeated professional exposure to aversive details of traumatic events (American Psychiatric Association, 2022).

In workplace settings, events meeting Criterion A can include: witnessing or being involved in serious workplace accidents; being subjected to physical assault, sexual violence, or credible threats of harm; exposure to armed robbery, workplace siege, or terrorism; and, for first responders and frontline workers, repeated professional exposure to traumatic material.

The Expanding Evidence: Beyond Criterion A

While the DSM-5-TR maintains a specific definition of trauma, a growing body of research demonstrates that events not traditionally classified under Criterion A can produce symptom profiles indistinguishable from PTSD. Pai et al. (2017) and subsequent studies have shown that chronic emotional abuse, sustained workplace bullying, and prolonged harassment can produce post-traumatic stress symptoms equivalent to those arising from traditionally defined traumas.

A study of college students by researchers examining mental health outcomes found that experiencing bullying was the strongest predictor of developing PTSD symptoms, exceeding physical abuse, neglect, and community violence (Idsoe et al., 2012). A meta-analysis by Nielsen and colleagues (2015) reviewing 29 studies on workplace and school bullying found that, on average, 57% of bullying victims scored above the clinical threshold for PTSD caseness, with a correlation of .42 between bullying exposure and overall PTSD symptom scores.

This evidence is particularly significant for Australian workplaces. Safe Work Australia’s 2025 data shows that harassment and workplace bullying account for 33.2% of all serious mental stress claims, with exposure to workplace violence and harassment contributing a further 15.7% (Safe Work Australia, 2025). These are not minor interpersonal disagreements. They represent sustained patterns of harm that the research literature increasingly recognises as traumatic in their psychological impact.

WorkSafe Victoria’s Recognition of Workplace Trauma

Notably, the WorkSafe Victoria Practice Directive on Mental Injury Eligibility (effective 31 March 2024) explicitly recognises that traumatic events in the workplace may involve exposure to abuse, bullying, harassment, the threat of harm, or actual harm (WorkSafe Victoria, 2024). The Directive further states that workers do not need to demonstrate a diagnosis of PTSD specifically; any mental injury causing significant behavioural, cognitive, or psychological dysfunction and diagnosed in accordance with the DSM is potentially compensable. Unreasonable behaviours including bullying, harassment, and discrimination are not considered events reasonably expected in the course of a worker’s duties and may constitute traumatic events under the legislation.

Why Workplace Experiences Cause Trauma, Not ‘Adjustment’

1. The Nature of the Stressor Is Traumatic

Adjustment disorder, by definition, arises from stressors that are within the range of common human experience, such as relationship breakdown, relocation, or job change. Workplace bullying, harassment, sexual harassment, discrimination, threats to safety, and psychosocial injury are not ordinary stressors. They involve sustained, deliberate, interpersonal harm within a power-imbalanced context from which the person cannot easily escape due to financial, contractual, or professional obligations.

The cognitive theory of trauma proposed by Janoff-Bulman (1992) holds that an event becomes traumatic when it shatters a person’s fundamental assumptions about the world: that the world is benevolent, that events are meaningful, and that the self is worthy. Workplace bullying, particularly by managers or institutional systems, systematically undermines all three assumptions. Conway and colleagues (2018) demonstrated that the relationship between workplace bullying and PTSD symptoms remains significant even after controlling for exposure to other recent traumatic events, supporting the independent traumatic impact of workplace bullying.

2. Workplace Trauma Is Prolonged and Repeated

Unlike a single-incident stressor that might produce an adjustment reaction, workplace psychological injury typically involves repeated and prolonged exposure to harmful conditions. This pattern aligns more closely with the profile described in the ICD-11 as a risk factor for complex PTSD (CPTSD): exposure to events of an extremely threatening or horrific nature, most commonly prolonged or repetitive events from which escape is difficult or impossible (World Health Organization, 2019).

The ICD-11 conceptualisation of complex PTSD includes the core PTSD symptoms of re-experiencing, avoidance, and heightened sense of current threat, plus three disturbances of self-organisation: affect dysregulation, negative self-concept, and interpersonal difficulties (Cloitre et al., 2013; Brewin et al., 2017). Workers who have experienced sustained bullying, harassment, or psychosocial hazard exposure frequently present with exactly this symptom profile yet are commonly diagnosed with adjustment disorder.

3. The Symptom Profile Does Not Fit Adjustment Disorder

Workers referred through compensation systems frequently present with symptoms that are hallmarks of PTSD rather than adjustment disorder. These include intrusive memories or flashbacks of specific workplace incidents; avoidance of workplace-related stimuli (the building, certain colleagues, emails, or work-related tasks); hypervigilance and an exaggerated startle response; significant sleep disturbance including trauma-related nightmares; negative alterations in cognition including persistent beliefs that no workplace is safe or that they are fundamentally damaged; emotional numbing or detachment; and irritability or anger outbursts.

These are DSM-5-TR Criterion B through E symptoms for PTSD. Adjustment disorder does not include intrusive re-experiencing, avoidance of trauma-related stimuli, or hyperarousal as defining features. When these symptoms are present, they point towards a trauma-specific diagnosis. A longitudinal Australian study by O’Donnell and colleagues (2016) found that intrusive memory was the symptom most strongly associated with adjustment disorder following trauma exposure, providing evidence that adjustment disorder in this context sits on a PTSD continuum rather than representing a qualitatively distinct condition.

4. The Duration Exceeds Adjustment Disorder Parameters

The DSM-5-TR specifies that adjustment disorder symptoms should resolve within six months of the stressor or its consequences ending. In practice, many workers on compensation claims present with symptoms persisting well beyond six months, often for years. Safe Work Australia data shows that the median time off work for psychological injury claims is 35.7 weeks (Safe Work Australia, 2025), and many workers remain symptomatic long after ceasing work. This chronicity is characteristic of PTSD and complex PTSD, not adjustment disorder.

Moral Injury: An Overlooked Dimension

A further dimension often missed in the diagnostic formulation is moral injury. Moral injury occurs when individuals experience or witness events that transgress deeply held moral beliefs and expectations, particularly when perpetrated or sanctioned by those in positions of authority (Litz et al., 2009). In workplace settings, moral injury arises when organisations fail to act on complaints, retaliate against workers who report concerns, or when leadership engages in or condones harmful behaviour.

Moral injury produces a distinctive symptom profile including shame, guilt, anger, a sense of betrayal, and loss of trust in institutions and authority figures. These symptoms compound the traumatic impact of workplace bullying and harassment and contribute to the complex PTSD profile frequently observed in injured workers. They are not adequately captured by a diagnosis of adjustment disorder.

Why Does the Misdiagnosis Happen?

Several systemic and clinical factors contribute to the overuse of adjustment disorder in workers’ compensation contexts.

Premature diagnosis by non-specialist assessors

General practitioners, who are often the first point of diagnostic contact for WorkCover claims, may not conduct the structured clinical assessment required to distinguish PTSD from adjustment disorder. Certificate of Capacity forms require a diagnosis, and adjustment disorder may be applied as a holding category in the absence of a comprehensive trauma-focused evaluation.

Narrow interpretation of Criterion A

Some clinicians interpret the DSM-5-TR Criterion A restrictively, concluding that workplace bullying or harassment does not constitute a traumatic event. As outlined above, this interpretation is inconsistent with the growing evidence base and with WorkSafe Victoria’s own Practice Directive, which recognises bullying, harassment, and discrimination as potentially traumatic workplace events.

Diagnostic conservatism in adversarial systems

Workers’ compensation systems are inherently adversarial. There is a systemic incentive to minimise the severity of diagnoses, as PTSD carries greater treatment implications, longer expected recovery timelines, and higher associated costs than adjustment disorder. This creates a context in which adjustment disorder may be preferred as a less ‘costly’ diagnosis, even when it does not accurately describe the person’s clinical presentation.

Insufficient training in trauma assessment

Not all treating practitioners have specific training in structured trauma assessment. Without the use of validated trauma-focused assessment tools such as the Clinician-Administered PTSD Scale (CAPS-5), the PCL-5, or the International Trauma Questionnaire (ITQ), clinicians may not systematically evaluate for the full range of PTSD or complex PTSD symptoms.

Adjustment disorder as a residual category

As Bachem and Casey (2018) and O’Donnell et al. (2016) have noted, adjustment disorder has historically functioned as a residual or ‘wastebasket’ diagnosis, applied when the clinician is uncertain rather than when the clinical presentation genuinely fits the diagnostic criteria. This is a well-documented problem in the research literature and is particularly consequential in compensation settings where diagnosis drives treatment access and entitlements.

The Consequences of Getting It Wrong

Inadequate Treatment

The treatment pathways for adjustment disorder and PTSD are fundamentally different. Adjustment disorder is generally expected to resolve with supportive counselling, brief psychotherapy, and removal of the stressor (Casey, 2014). PTSD requires trauma-focused interventions that directly address traumatic memories and their impact, including Cognitive Processing Therapy (CPT), Prolonged Exposure (PE), Eye Movement Desensitisation and Reprocessing (EMDR), or trauma-focused Cognitive Behavioural Therapy (TF-CBT) (Phoenix Australia, 2020). When a person with PTSD is treated with supportive counselling alone, their symptoms are likely to persist or worsen, prolonging suffering and delaying recovery.

Reduced Access to Appropriate Services

In the Australian workers’ compensation context, diagnosis directly influences the number and type of treatment sessions approved, the duration of income support, and access to specialist intervention. A diagnosis of adjustment disorder may result in fewer approved sessions and an expectation of rapid recovery that is inconsistent with the person’s actual clinical trajectory.

Invalidation of the Worker’s Experience

Receiving a diagnosis of adjustment disorder when one has experienced sustained workplace trauma can be profoundly invalidating. It implicitly communicates that what happened to the person was merely stressful rather than traumatic, and that their difficulties represent an excessive reaction to an ordinary event. For many workers, this mirrors the dismissal and minimisation they experienced in the workplace itself, compounding psychological harm.

Poorer Return-to-Work Outcomes

Safe Work Australia data consistently shows that workers with psychological injuries have poorer return-to-work outcomes than those with physical injuries, with a return-to-work rate of 79.1% compared to 91.6% for all claims (Safe Work Australia, 2024). When the diagnosis does not accurately reflect the condition, treatment is misaligned, and recovery is delayed, these outcomes are likely to worsen further.

Clinical Implication: If a worker presents with intrusive re-experiencing, avoidance of trauma-related stimuli, hypervigilance, emotional numbing, and symptoms persisting beyond six months, the clinician should conduct a structured trauma assessment before defaulting to a diagnosis of adjustment disorder.

What Should Clinicians Do Instead?

When assessing workers who have experienced workplace psychological injury, clinicians should adopt the following practices.

Conduct a structured trauma assessment

Use validated instruments such as the PCL-5, CAPS-5, or ITQ to systematically evaluate for PTSD and complex PTSD symptoms, rather than relying on clinical impression alone.

Assess for all four PTSD symptom clusters

Ensure that intrusion, avoidance, negative alterations in cognition and mood, and arousal/reactivity symptoms are all explicitly evaluated. If symptoms in these clusters are present and have persisted for more than one month, PTSD should be considered.

Evaluate for complex PTSD

Where workplace injury has involved prolonged or repeated interpersonal harm, assess for the additional symptom clusters of affect dysregulation, negative self-concept, and interpersonal difficulties using the ITQ or clinical interview.

Consider moral injury

Explore whether the person’s distress includes shame, guilt, betrayal, and loss of trust in institutions, which may indicate moral injury alongside or contributing to their trauma response.

Apply the adjustment disorder exclusion rule

Remember that adjustment disorder is a diagnosis of exclusion. If the symptom profile meets criteria for PTSD, major depressive disorder, or another specified disorder, adjustment disorder should not be diagnosed.

Document the traumatic nature of workplace events

In clinical reports, clearly articulate how the workplace events meet or approximate the definition of a traumatic stressor, referencing the evidence base on workplace bullying and PTSD.

Conclusion

The evidence is clear. Workplace bullying, harassment, discrimination, and psychosocial hazard exposure can and do produce trauma responses. A diagnosis of adjustment disorder, while sometimes appropriate in the early stages of assessment, should not be maintained when the clinical presentation includes intrusive re-experiencing, avoidance, hyperarousal, negative cognitive changes, and symptom persistence beyond six months. Doing so misrepresents the nature and severity of the injury, delays access to effective trauma-focused treatment and ultimately harms the worker.

As Australian workplaces grapple with the rapidly increasing burden of psychological injury claims, accurate diagnosis is not merely a clinical exercise. It is a matter of justice, recovery, and the fundamental obligation to name harm accurately so that healing can begin.

Frequently Asked Questions

Can workplace bullying cause PTSD?

Yes. Research demonstrates that sustained workplace bullying can produce symptom profiles indistinguishable from PTSD. A meta-analysis by Nielsen and colleagues (2015) found that 57% of bullying victims scored above the clinical threshold for PTSD. WorkSafe Victoria's 2024 Practice Directive explicitly recognises bullying, harassment, and discrimination as potentially traumatic workplace events.

What is the difference between adjustment disorder and PTSD in workers' compensation?

Adjustment disorder describes a time-limited stress response to an identifiable stressor, expected to resolve within six months. PTSD involves intrusive re-experiencing, avoidance of trauma-related stimuli, negative cognitive changes, and hyperarousal following a traumatic event. In workers' compensation, the diagnosis directly affects the number of approved treatment sessions, duration of income support, and access to trauma-focused interventions. A misdiagnosis of adjustment disorder when PTSD is present can result in inadequate treatment and delayed recovery.

What assessment tools should clinicians use for workplace trauma?

Clinicians assessing workplace psychological injury should use validated instruments including the PCL-5 (PTSD Checklist for DSM-5), CAPS-5 (Clinician-Administered PTSD Scale), or ITQ (International Trauma Questionnaire) to systematically evaluate for PTSD and complex PTSD symptoms. Clinical impression alone is insufficient to distinguish between adjustment disorder and trauma-specific diagnoses.

Why is adjustment disorder overdiagnosed in WorkCover claims?

Several factors contribute. General practitioners completing Certificates of Capacity may apply adjustment disorder as a holding diagnosis without structured trauma assessment. Some clinicians interpret DSM-5-TR Criterion A too narrowly, excluding workplace bullying. The adversarial nature of workers' compensation creates systemic incentives to minimise diagnostic severity. Research by Bachem and Casey (2018) and O'Donnell et al. (2016) has documented adjustment disorder functioning as a residual diagnostic category in these settings.

What is moral injury in the workplace?

Moral injury occurs when individuals experience or witness events that violate deeply held moral beliefs, particularly when perpetrated or sanctioned by those in authority. In workplace settings, it arises when organisations fail to act on complaints, retaliate against workers who report concerns, or when leadership condones harmful behaviour. Moral injury produces shame, guilt, anger, a sense of betrayal, and loss of trust in institutions, compounding the traumatic impact of workplace bullying and harassment.

References

• American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Association.

• Bachem, R., & Casey, P. (2018). Adjustment disorder: A diagnosis whose time has come. Journal of Affective Disorders, 227, 243–253. https://doi.org/10.1016/j.jad.2017.10.034

• Brewin, C. R., Cloitre, M., Hyland, P., Shevlin, M., Maercker, A., Bryant, R. A., ... & Reed, G. M. (2017). A review of current evidence regarding the ICD-11 proposals for diagnosing PTSD and complex PTSD. Clinical Psychology Review, 58, 1–15. https://doi.org/10.1016/j.cpr.2017.09.001

• Casey, P. (2014). Adjustment disorder: New developments. Current Psychiatry Reports, 16(6), 451. https://doi.org/10.1007/s11920-014-0451-2

• Cloitre, M., Garvert, D. W., Brewin, C. R., Bryant, R. A., & Maercker, A. (2013). Evidence for proposed ICD-11 PTSD and complex PTSD: A latent profile analysis. European Journal of Psychotraumatology, 4(1), 20706. https://doi.org/10.3402/ejpt.v4i0.20706

• Conway, P. M., Hogh, A., Balducci, C., & Ebbesen, D. K. (2018). Workplace bullying and mental health. In P. D’Cruz et al. (Eds.), Pathways of job-related negative behaviour. Springer.

• Herman, J. L. (1992). Complex PTSD: A syndrome in survivors of prolonged and repeated trauma. Journal of Traumatic Stress, 5(3), 377–391. https://doi.org/10.1007/BF00977235

• Idsoe, T., Dyregrov, A., & Idsoe, E. C. (2012). Bullying and PTSD symptoms. Journal of Abnormal Child Psychology, 40(6), 901–911. https://doi.org/10.1007/s10802-012-9620-0

• Janoff-Bulman, R. (1992). Shattered assumptions: Towards a new psychology of trauma. Free Press.

• Litz, B. T., Stein, N., Delaney, E., Lebowitz, L., Nash, W. P., Silva, C., & Maguen, S. (2009). Moral injury and moral repair in war veterans: A preliminary model and intervention strategy. Clinical Psychology Review, 29(8), 695–706. https://doi.org/10.1016/j.cpr.2009.07.003

• Nielsen, M. B., Tangen, T., Idsoe, T., Matthiesen, S. B., & Magerøy, N. (2015). Post-traumatic stress disorder as a consequence of bullying at work and at school: A literature review and meta-analysis. Aggression and Violent Behavior, 21, 17–24. https://doi.org/10.1016/j.avb.2015.01.001

• O’Donnell, M. L., Alkemade, N., Creamer, M., McFarlane, A. C., Silove, D., Bryant, R. A., ... & Forbes, D. (2016). A longitudinal study of adjustment disorder after trauma exposure. American Journal of Psychiatry, 173(12), 1231–1238. https://doi.org/10.1176/appi.ajp.2016.16010071

• Pai, A., Suris, A. M., & North, C. S. (2017). Posttraumatic stress disorder in the DSM-5: Controversy, change, and conceptual considerations. Behavioral Sciences, 7(1), 7. https://doi.org/10.3390/bs7010007

• Phoenix Australia – Centre for Posttraumatic Mental Health. (2020). Australian guidelines for the prevention and treatment of acute stress disorder, posttraumatic stress disorder and complex PTSD. Phoenix Australia.

• Safe Work Australia. (2024). Psychological health and safety in the workplace. Safe Work Australia. https://data.safeworkaustralia.gov.au

• Safe Work Australia. (2025). Key work health and safety statistics Australia 2025. Safe Work Australia. https://data.safeworkaustralia.gov.au

• Verkuil, B., Atasayi, S., & Molendijk, M. L. (2015). Workplace bullying and mental health: A meta-analysis on cross-sectional and longitudinal data. PLoS ONE, 10(8), e0135225. https://doi.org/10.1371/journal.pone.0135225

• World Health Organization. (2019). International classification of diseases for mortality and morbidity statistics (11th revision). World Health Organization.

• WorkSafe Victoria. (2024). Practice directive: Mental injury eligibility. WorkSafe Victoria. https://www.worksafe.vic.gov.au/practice-directive-mental-injury-eligibility

About Behavioural Edge Psychology

Behavioural Edge Psychology is a specialised psychology practice in Victoria, Australia, offering the unique intersection of individual therapeutic support and organisational psychology expertise.

Dr. Sarah Fischer holds both a Masters and PhD in Psychology with AHPRA registration, providing:

• Individual therapy for adults using evidence-based models

• Workplace psychosocial risk assessments

• Fitness-for-work psychological evaluations

• Psychological injury claim assessments

• Individual therapy for work-related psychological conditions

• Organisational psychology consultancy

• Expert psychological reports for legal proceedings

• Return-to-work planning and support

  
  

Locations: Caulfield South and St Kilda, Victoria

About the Author: Dr Sarah Fischer, MAPS

Dr Sarah Fischer is a PhD- and Masters-qualified Principal Psychologist and AHPRA-endorsed Organisational Psychologist with over 15 years of experience in high-stakes clinical and corporate environments. Specialising in the intersection of neuro-affirming care and systemic workplace health, her work focuses on Anxiety, Depression, Trauma, Stress, Burnout, Adult Neurodivergence, and the management of Psychosocial Hazards under Victoria’s 2025/2026 OHS Regulations. As a ‘Prac-academic,’ Dr Fischer bridges the gap between clinical research and real-world application. She is a published researcher on cognitive flexibility and clinical governance, ensuring all interventions at Behavioural Edge Psychology are evidence-based and trauma-informed.

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This article reflects expert observations from Dr. Sarah Fischer's practice at Behavioural Edge Psychology. Content is intended for educational purposes and does not replace professional psychological assessment treatment. For assessment or psychological support, please consult with an appropriately qualified psychologist.