ICD-11 vs. DSM-5: Key Differences and How They Are Used in Practice

ICD and DSM: How Did the Two Systems Develop?

Two major diagnostic frameworks are widely used in mental health: the International Classification of Diseases (ICD) and the Diagnostic and Statistical Manual of Mental Disorders (DSM).

ICD is maintained by the World Health Organization (WHO) and covers the entire field of medicine. Alongside mental, behavioral, and neurodevelopmental disorders, it includes infectious diseases, cancers, cardiovascular conditions, injuries, causes of death, and many other health conditions. The current edition is ICD-11.^[4]

DSM is published by the American Psychiatric Association (APA) and focuses exclusively on mental disorders. Its current edition is DSM-5, with the updated text revision known as DSM-5-TR.^[3]

Both systems were developed to give clinicians and researchers a consistent way to describe mental disorders. They share many diagnoses and often use similar concepts, but they were developed by different organizations and serve somewhat different purposes.^[12]

For patients, the distinction between ICD-11 and DSM-5 is usually less important than the quality of the assessment itself. Whether a clinician uses one system or the other, the person may experience the same anxiety, depressed mood, intrusive thoughts, or psychotic symptoms. What matters most is whether the assessment accurately captures the person's difficulties, considers alternative explanations, evaluates functioning, and leads to appropriate care.

ICD-11: A Global Classification Used Across Medicine

One of the defining features of ICD-11 is its scope. It is not a psychiatric manual; it is a classification system for health conditions across medicine. Mental, behavioral, and neurodevelopmental disorders are covered in one part of the classification.

Because of this broader role, ICD codes are used in medical records, health statistics, epidemiological research, reporting systems, and other forms of health information management.

For mental health, WHO also provides the Clinical Descriptions and Diagnostic Requirements (CDDR) for ICD-11 Mental, Behavioural and Neurodevelopmental Disorders. The CDDR is designed to support the accurate identification and diagnosis of mental disorders in clinical practice.

The CDDR goes beyond simply listing diagnostic codes. It describes the main clinical features of each disorder, helps distinguish related conditions, and provides information relevant to course, development, age, sex, culture, and differential diagnosis. This makes it a clinical resource as well as a classification reference.^[6]

ICD also has an important administrative role. In many countries, it provides the coding framework used for medical documentation, health statistics, and reimbursement. Even when a clinician uses DSM terminology as part of their clinical or research work, the diagnosis recorded in the healthcare system is often ultimately represented by an ICD code.

DSM-5: A Diagnostic Manual for Mental Disorders

DSM-5 has a much narrower scope. Unlike ICD-11, it focuses exclusively on mental disorders and does not classify diseases across the rest of medicine.

Published by the American Psychiatric Association, DSM-5 has a particularly strong role in clinical practice, research, and professional education in the United States. Its development and structure are discussed in more detail in What Is DSM-5?

DSM has traditionally placed greater emphasis on specific operational diagnostic criteria. Many diagnoses are defined using lists of symptoms, along with requirements concerning symptom counts, duration, and clinical significance. This approach can be particularly useful in research, where clearly defined criteria help researchers establish comparable study groups.

DSM-5-TR does not replace ICD as a healthcare coding system. In the United States, clinicians can use DSM-5-TR criteria to make a diagnosis while recording the corresponding ICD-10-CM code for billing, documentation, and reporting.^[15]

The two systems therefore often work side by side rather than competing directly. DSM provides a detailed framework for psychiatric diagnosis, while ICD provides the broader classification and coding system used throughout healthcare.

Where Do ICD-11 and DSM-5 Overlap?

ICD-11 and DSM-5 cover much of the same territory. Both include depressive disorders, bipolar disorders, anxiety disorders, schizophrenia and other psychotic disorders, obsessive-compulsive and related disorders, eating disorders, substance use disorders, and neurodevelopmental disorders.

This overlap is not accidental. The development of DSM-5 and ICD-11 took place partly in parallel, with efforts to improve consistency between the two systems where possible. As a result, many diagnoses are conceptually similar even when their names, criteria, or organization differ.^[5]

Both systems also share several basic principles. They distinguish mental disorders from normal variations in thoughts, emotions, and behavior, consider the impact of symptoms on functioning, and place importance on differential diagnosis and alternative explanations.

That said, similar does not mean identical. A diagnosis in one system should not automatically be assumed to have exactly the same criteria or meaning in the other.

A study comparing the diagnostic requirements for 103 conditions shared by ICD-11 and DSM-5 found that some diagnoses were highly similar, while others showed more substantial differences.^[4]

Where Do ICD-11 and DSM-5 Differ?

One of the clearest differences is how diagnostic criteria are presented. DSM-5 generally relies more heavily on defined symptom lists and numerical thresholds. ICD-11 often places greater emphasis on essential clinical features and descriptions of the overall clinical presentation.

The differences become particularly apparent in certain diagnostic areas.

Personality Disorders

Personality disorders are one of the most significant examples. ICD-11 moved away from the traditional system of separate personality disorder types and instead uses a dimensional approach based primarily on severity and trait domains, with an additional borderline pattern qualifier.^[8]

DSM-5-TR retains the traditional categorical personality disorder diagnoses in its main diagnostic framework, while a dimensional alternative model is presented separately.^[9]

Trauma- and Stress-Related Disorders

The two systems also differ in how they classify trauma-related disorders. ICD-11 distinguishes post-traumatic stress disorder (PTSD; 6B40) from complex post-traumatic stress disorder (CPTSD; 6B41) as separate diagnoses.^[11]

DSM-5-TR does not classify CPTSD as a separate diagnosis in the same way. Both systems recognize prolonged grief disorder, although there are differences in the diagnostic requirements, including the timing and organization of symptoms.^[7]

Gaming Disorder

Another notable difference concerns gaming-related problems. ICD-11 recognizes gaming disorder as a formal diagnosis within disorders due to addictive behaviors. DSM-5 originally placed internet gaming disorder among conditions recommended for further study rather than including it as a full diagnosis in the main classification.

These differences illustrate why ICD-11 and DSM-5 should not be treated as interchangeable lists of equivalent diagnoses.

Which System Is Used in Clinical Practice?

For medical records, health statistics, reporting, and reimbursement, health systems generally rely on ICD. The specific version varies from country to country. Many countries continue to use ICD-10 or a national modification, such as ICD-10-GM in Germany, ICD-10-AM in Australia, or ICD-10-CA in Canada, while preparing for the eventual transition to ICD-11.

The United States is somewhat different. Diagnoses are reported using ICD-10-CM, the U.S. clinical modification of ICD-10, maintained by the National Center for Health Statistics.^[14]

At the same time, DSM-5-TR is the primary psychiatric diagnostic manual used in American mental health practice. The American Psychiatric Association provides corresponding ICD-10-CM codes for DSM-5-TR diagnoses, allowing clinicians to use DSM criteria while still meeting ICD-based coding requirements.^[15]

Outside the United States, DSM generally does not serve as the formal coding system. It remains widely used in research, professional training, education, and international literature, while medical records typically follow the ICD version adopted by the country.

Poland is one example: healthcare documentation and reporting currently use ICD-10, while preparations are underway for the transition to ICD-11.

Because implementation schedules vary, the classification required in a particular country or healthcare setting should always be confirmed with the relevant national authority.

From ICD-10 to ICD-11: What Is Changing?

For clinicians working in healthcare systems that use ICD, the transition from ICD-10 to ICD-11 is often more significant than the distinction between ICD-11 and DSM-5.

ICD-11 is not simply a new set of codes. It introduces changes to the structure, terminology, and organization of many diagnostic groups.

For example, personality disorders are now described primarily in terms of severity and trait domains rather than the traditional list of personality disorder types. Schizophrenia is no longer divided into the classic subtypes used in ICD-10. Autism spectrum disorder is described with additional specifications concerning intellectual functioning and language development.

ICD-11 also introduced diagnostic categories that did not exist as distinct diagnoses in ICD-10, including complex PTSD, prolonged grief disorder, and gaming disorder.^[10]

The classification has also been designed as a digital system. WHO provides an online Browser, Coding Tool, API, and other implementation resources, making ICD-11 more suitable for integration into modern health information systems.^[13]

For clinicians, this means learning not only new codes but also the underlying logic of the revised classification. For patients, the transition does not necessarily mean that the underlying difficulties have changed. What may change is how those difficulties are described and classified.

Does the Classification System Matter for Patients?

Usually, the classification system itself matters less than how carefully the assessment is carried out.

A person's symptoms and difficulties do not change simply because a clinician uses ICD-11 instead of DSM-5. Anxiety remains anxiety, depressed mood remains depressed mood, and intrusive thoughts or psychotic experiences remain the same experiences regardless of the diagnostic framework used to describe them.

What makes the greatest difference is the quality of the assessment: understanding the person's history, identifying the relevant symptoms, considering alternative explanations, assessing functioning, recognizing co-occurring conditions, and choosing appropriate treatment or support.

The classification does matter for documentation, however. Medical records and reporting systems use standardized codes so that diagnoses can be communicated consistently between professionals and across healthcare systems.

A DSM-5-TR diagnosis and an ICD diagnosis are therefore not necessarily contradictory. They may describe the same clinical condition using different classification frameworks. When the distinction matters, the clinician can clarify which ICD code corresponds to the diagnosis.

Which System Should You Learn or Use?

For students, psychologists, psychiatrists, and other professionals working in countries that use ICD, ICD should generally be the primary system to understand for clinical documentation and healthcare practice.

DSM-5-TR is still extremely valuable, particularly for anyone working with international research literature. A large body of psychiatric research, especially from the United States, continues to use DSM criteria.

For clinicians and researchers working internationally, understanding both systems is therefore useful. ICD provides the framework used by the healthcare system, while DSM can provide an additional reference point for research, education, and comparison with the international literature.

The most useful approach is not to choose one system and ignore the other, but to understand how the two systems relate to each other and where their definitions differ.

ICD as the Healthcare Standard, DSM as a Complement

ICD-11 and DSM-5 are two major frameworks for describing mental disorders. They have much in common, but they were developed for different purposes and should not be treated as interchangeable.

ICD-11 is WHO's global classification of diseases and health conditions, and its codes are used for medical documentation, health statistics, and reporting. DSM-5-TR is the American Psychiatric Association's diagnostic manual for mental disorders and plays a particularly important role in U.S. clinical practice and research.

The transition to ICD-11 is underway internationally, but countries are moving at different speeds. Many healthcare systems still rely on ICD-10 or a national modification, while the United States currently uses ICD-10-CM for diagnostic coding.

Ultimately, neither classification system replaces clinical judgment. A diagnosis depends on a careful assessment of the person's symptoms, history, functioning, and overall clinical picture. Classification systems provide a standardized framework for describing that picture; they do not make the clinical decision on their own.

Frequently Asked Questions