Panic Disorder ICD-11 Diagnostic Requirements Explained
Author: Ukrainian Psychological Hub · Published: September 30, 2026 · Editorial Policy
In ICD-11, Panic Disorder is coded 6B01 and belongs to the grouping of anxiety or fear-related disorders. The diagnosis requires more than having a frightening episode or experiencing panic symptoms. The central pattern is recurrent panic attacks, with at least some attacks occurring unexpectedly, followed by persistent concern about further attacks or their meaning, or by behavior intended to prevent recurrence. The presentation must also meet the functional threshold for a clinical disorder and must not be better explained by another mental disorder, a medical condition, or a substance or medication effect. These requirements are described in the World Health Organization's Clinical Descriptions and Diagnostic Requirements for ICD-11 Mental, Behavioural and Neurodevelopmental Disorders.
This article explains the ICD-11 diagnostic requirements for Panic Disorder itself. It does not turn a panic attack into a diagnosis, and it does not use an online symptom match, questionnaire result, or self-test as proof of a disorder. Panic attacks can occur in people who do not have Panic Disorder, and they can occur in other mental disorders and alongside medical conditions.
For the broader clinical picture, including causes and treatment, see Panic Disorder: Symptoms, Causes, Diagnosis, and Treatment. For the place of Panic Disorder within the ICD-11 anxiety or fear-related disorders grouping, see ICD-11 Anxiety Classification: Anxiety or Fear-Related Disorders.
What does ICD-11 require for a Panic Disorder diagnosis?
The shortest accurate summary is that ICD-11 requires a recurring syndrome, not an isolated panic event. The clinician looks for recurrent panic attacks, verifies that at least some have been unexpected, examines what happens between attacks, evaluates impairment, and determines whether the attacks are confined to another disorder or are better accounted for by a medical or substance-related cause.
ICD-11 is intentionally organized around essential clinical features rather than a rigid self-scoring checklist. Kogan and colleagues' ICD-11 classification paper describes this essential-features approach and the effort to improve global clinical utility while clarifying the relationship among Panic Disorder, agoraphobia, and panic attacks that occur in other disorders. A later global case-controlled field study found that the ICD-11 anxiety and fear-related disorder guidelines had strong overall diagnostic accuracy and clinical utility, while also showing why careful application of panic-attack boundaries matters.
ICD-11 code 6B01 and the diagnostic territory of Panic Disorder
ICD-11 assigns Panic Disorder the code 6B01. The code refers to a specific disorder characterized by recurrent panic attacks and their consequences. It is not a code for every episode of intense anxiety, every episode of rapid heartbeat or shortness of breath, or every situation in which a person says they had an “anxiety attack.” The expression “anxiety attack” is common in everyday language but is not a separate ICD-11 diagnosis.
This distinction preserves diagnostic territory. Panic Disorder, agoraphobia, generalized anxiety disorder, social anxiety disorder, specific phobia, separation anxiety disorder, and selective mutism have separate clinical requirements. OCD and PTSD are classified in different ICD-11 groupings. A person can experience panic within several of these conditions without Panic Disorder automatically becoming the correct diagnosis.
The broader cluster architecture is explained in Anxiety Disorders: Symptoms, Types, Diagnosis, and Treatment.
Requirement 1: recurrent panic attacks
The first requirement is recurrence. Panic Disorder is built around repeated panic attacks rather than one isolated episode. A panic attack is a discrete episode of intense fear or apprehension in which several characteristic symptoms develop rapidly and occur together. The symptom pattern can include a racing or pounding heart, sweating, trembling, shortness of breath, a choking sensation, chest discomfort, nausea or abdominal distress, dizziness, chills or hot sensations, tingling or numbness, depersonalization or derealization, fear of losing control, and fear of imminent death.
The important diagnostic feature is the sudden episode and the rapid co-occurrence of symptoms. A person can have some of the same sensations during ordinary stress, sustained generalized anxiety, illness, exercise, medication effects, or another physiological state. Those sensations become a panic attack only when the overall episode has the characteristic acute pattern.
ICD-11 does not use a fixed numerical symptom count for Panic Disorder
A frequent search question is how many panic symptoms ICD-11 requires. ICD-11 does not impose the same fixed numerical panic-symptom threshold used in DSM-style criteria. It describes the rapid onset of several characteristic symptoms. A 2025 review of the transition from ICD-10 to ICD-11 notes this change explicitly: the newer system no longer retains the older rigid minimum symptom count and instead emphasizes the clinically recognizable panic-attack pattern. See Domschke and Zwanzger (2025).
That does not make every surge of anxiety a panic attack. The attack still has to be a discrete episode with intense fear or apprehension and a rapid constellation of characteristic symptoms. It means the ICD-11 framework should be read as ICD-11, rather than rewritten into a numerical DSM checklist.
Panic attacks usually peak quickly, but episode length is not the diagnosis
Panic attacks typically escalate rapidly and often resolve within minutes, although the subjective and physiological aftermath can last longer. Episode duration alone does not establish Panic Disorder. The diagnosis depends on recurrence, unexpectedness, the between-attack pattern, functional impact, and appropriate exclusions.
Requirement 2: at least some panic attacks are unexpected
ICD-11 requires that at least some attacks be unexpected. In clinical terms, an unexpected attack is not consistently restricted to a specific feared object, situation, cue, or context. It can seem to arise “out of the blue” from the person's perspective. This feature helps distinguish Panic Disorder from panic that occurs only when a person encounters the defining trigger of another disorder.
Unexpected does not mean that the attack has no causes, mechanisms, bodily antecedents, or psychological context. It means the attack is not predictably limited to a particular external or internal cue that already defines another condition. A person may later identify fatigue, bodily sensations, conflict, caffeine, illness, or subtle contextual cues that increased vulnerability without changing the clinical fact that the attack was not consistently tied to one feared situation.
An attack can become more predictable over time
After repeated attacks, people often learn associations between panic and places, sensations, or situations. An attack that was initially unexpected can therefore contribute to later anticipatory fear. Over time, some attacks may become more expected because the person has learned to fear bodily sensations, environments, or circumstances associated with previous episodes. The history of the syndrome matters more than forcing every later attack into the same category.
Requirement 3: persistent concern, worry, or behavior change after the attacks
Recurrent unexpected attacks alone are not enough. ICD-11 also requires a persistent post-attack change. This can take the form of continuing concern or worry about having another attack, worry about what the attack means, or behavior intended to prevent recurrence or avoid feared consequences.
Examples can include repeatedly monitoring the heart or breathing, seeking reassurance, carrying “just in case” items, changing routes, avoiding exercise because a faster heartbeat feels dangerous, staying near exits, avoiding being alone, or arranging daily life around access to perceived safety. These behaviors are clinically relevant when they arise from the panic pattern and contribute to impairment or the effort required to maintain functioning.
ICD-11 does not set the DSM-5-TR one-month rule
Another common source of confusion is duration. ICD-11 describes persistent concern or behavior change and gives “several weeks” as an illustrative time frame in its clinical guidance; it does not make a DSM-style one-month duration rule the defining ICD-11 threshold. The comparison by First and colleagues places Panic Disorder among diagnoses in which DSM uses greater operational specification than ICD-11. The two systems describe substantially overlapping clinical territory, but their wording and level of specification should not be merged.
Requirement 4: the attacks are not confined to the trigger pattern of another mental disorder
Panic attacks are transdiagnostic. They can occur in social anxiety disorder, specific phobia, agoraphobia, PTSD, OCD, depressive disorders, health-focused conditions, and other presentations. ICD-11 therefore asks whether the panic attacks occur only in situations that are already anxiety-provoking because of another disorder.
If attacks occur exclusively in response to a specific phobic object, feared social evaluation, a trauma reminder, or another disorder-specific cue, that pattern does not by itself establish an additional Panic Disorder diagnosis. If genuinely unexpected panic attacks also occur outside that trigger pattern and the full Panic Disorder requirements are met, a co-occurring Panic Disorder may be appropriate.
Panic Disorder and generalized anxiety disorder
The central distinction is temporal and phenomenological. Panic Disorder is organized around recurrent acute attacks and their consequences. Generalized anxiety disorder is organized around sustained generalized apprehension or excessive worry. Worry between panic attacks about having another attack is part of the panic syndrome and does not automatically become generalized anxiety disorder. Broader persistent worry across multiple life domains may require a separate assessment.
Panic Disorder and social anxiety or specific phobia
A person with social anxiety disorder can panic before or during social scrutiny, and a person with a specific phobia can panic when encountering the feared object or situation. The presence of intense panic does not erase the focus of apprehension that defines those disorders. Separate Panic Disorder becomes relevant when the history includes recurrent unexpected attacks that are not limited to those specific triggers.
Panic Disorder and OCD or PTSD
OCD and PTSD are not subtypes of anxiety disorder in ICD-11. Panic can occur in both. In OCD, acute fear may follow an obsession or perceived need to perform a compulsion. In PTSD, panic-like surges can be linked to trauma reminders or re-experiencing. The diagnostic task is to identify the organizing syndrome rather than treating the intensity of anxiety as proof of Panic Disorder.
Panic Disorder and health anxiety
Panic attacks frequently contain bodily sensations that can be interpreted as signs of catastrophe. Fear that a racing heart means a heart attack or that dizziness means collapse can be part of the panic episode. A broader, persistent preoccupation with having or acquiring serious illness has a different diagnostic organization. When health concerns are present, clinicians assess whether they are mainly consequences of panic, part of another health-focused syndrome, responses to real medical illness, or some combination.
Requirement 5: medical conditions, substances, and medications must be considered
ICD-11 requires that the panic symptoms not be better explained as a manifestation of another medical condition or by the direct effects of a substance or medication, including relevant withdrawal states. This is a core diagnostic requirement because panic attacks can involve chest discomfort, palpitations, shortness of breath, dizziness, trembling, sweating, nausea, numbness, and other symptoms that also occur in medical conditions.
A 2024 clinical review of the overlap between panic and medical illness examines chest pain, palpitations, dyspnea, dizziness, abdominal distress, and paresthesia and emphasizes the need to integrate psychological and medical assessment rather than assuming the cause from symptom similarity. See Tunnell and colleagues (2024).
A panic-like episode can have a medical differential
Depending on the presentation, clinicians may consider cardiac rhythm disturbances, acute coronary syndromes, respiratory disease, endocrine conditions, neurologic events, medication effects, stimulant use, intoxication, or withdrawal, among other possibilities. The relevant differential depends on age, medical history, onset, context, examination findings, and the exact symptom pattern. There is no single laboratory test that proves a psychiatric panic attack.
The U.S. National Library of Medicine's MedlinePlus guidance on panic disorder testing notes that clinical evaluation may include a physical examination and, when indicated, tests such as blood work or cardiac testing to investigate physical explanations. This is one reason screening questions and symptom lists cannot substitute for clinical assessment.
When physical symptoms should not be presumed to be panic
New or severe chest pain, fainting, severe or unusual shortness of breath, a sustained or clearly irregular heartbeat, new focal neurologic symptoms, severe confusion, or a rapidly changing physical condition should not be attributed to panic solely because anxiety is present. Panic and medical illness can coexist. Online comparison cannot safely rule out a medical emergency or establish the cause of a new physical symptom.
The purpose of this boundary is diagnostic accuracy, not alarm. Panic symptoms are often medically benign, but the safety problem runs in both directions: unnecessary testing can reinforce fear, while premature attribution to anxiety can miss a medical condition. The appropriate level of medical evaluation depends on the individual presentation.
Requirement 6: the pattern causes significant functional impairment
ICD-11 requires clinically meaningful functional impact. The panic pattern must interfere significantly with personal, family, social, educational, occupational, or another important area of functioning. The clinical guidance also recognizes that some people preserve outward performance only through substantial additional effort.
That distinction matters because impairment is not limited to obvious inability to leave home or work. A person may continue working, studying, parenting, traveling, or socializing while devoting extensive time and energy to planning escape routes, checking bodily sensations, avoiding exertion, arranging accompaniment, seeking reassurance, or recovering from attacks. The cost of maintaining functioning is part of the clinical picture.
Panic attack versus Panic Disorder in ICD-11
A panic attack is an episode. Panic Disorder is a longitudinal diagnosis. Someone can have a panic attack without ever developing Panic Disorder. The disorder requires the recurrent pattern, some unexpected attacks, persistent post-attack concern or preventive behavior, clinically significant functional impact, and the relevant differential exclusions.
This distinction also prevents the opposite error: dismissing recurrent unexpected attacks as “just anxiety” because each individual episode resolves. The diagnosis is based on the pattern across time, not on whether the person happens to be calm during an appointment.
What is the ICD-11 panic-attack qualifier MB23.H?
ICD-11 also provides a panic-attack symptom code or qualifier, MB23.H, that can be used when panic attacks are clinically relevant in the context of another disorder and the person does not meet the full requirements for Panic Disorder. This lets clinicians record meaningful panic phenomena without converting every occurrence of panic into a separate Panic Disorder diagnosis.
This architecture reflects an important ICD-11 principle discussed by Kogan and colleagues and in the 2025 ICD-10/ICD-11 comparison by Domschke and Zwanzger: panic attacks can be coded across diagnostic contexts while Panic Disorder retains its own diagnostic territory.
Panic Disorder and agoraphobia are separate ICD-11 diagnoses
ICD-11 treats Panic Disorder and agoraphobia as separate disorders that can be diagnosed together. This differs from older classification traditions that tied them more closely. Agoraphobia is organized around fear or anxiety across situations in which escape may feel difficult or help may seem unavailable if incapacitating or embarrassing symptoms occur. Panic Disorder is organized around recurrent panic attacks and their consequences.
The two conditions frequently interact. A person can begin avoiding public transport, crowded places, being outside alone, or other situations after panic attacks, and those patterns may eventually meet the separate requirements for agoraphobia. The correct classification depends on whether each disorder's own requirements are satisfied. The 2025 taxonomy review confirms that ICD-11 allows Panic Disorder and agoraphobia to be diagnosed separately and comorbidly. See Domschke and Zwanzger (2025).
Culture changes how panic is described and interpreted
ICD-11 is designed for global clinical use, and panic is not described identically across cultures. People may emphasize different bodily sensations, use culturally specific idioms of distress, or interpret the same physiological experience through different explanatory models. A clinician therefore has to understand what an episode means in the person's cultural context before deciding that it was genuinely unexpected or that a particular belief is evidence of psychopathology.
Culture can affect which sensations are noticed, which consequences are feared, when help is sought, and whether a situation is considered dangerous or ordinary. Cultural formulation does not remove the need for medical differential diagnosis, and it does not turn every culturally shaped episode into Panic Disorder. It improves the accuracy of interpreting the episode.
Age and developmental context matter
The ICD-11 clinical guidance describes Panic Disorder as uncommon in younger children and increasingly relevant from adolescence into adulthood. Development also changes how attacks are recognized and reported. Younger people may have difficulty labeling internal sensations or explaining anticipatory concern, while adolescents may describe panic through somatic complaints, avoidance, school disruption, or emergency help-seeking.
A diagnostic assessment in a young person therefore considers developmental capacity, family observations, school functioning, medical causes, substance use, depressive symptoms, suicidality, and other co-occurring conditions rather than simply applying an adult self-report template.
Course and severity are not determined by attack frequency alone
Panic Disorder can follow different courses. Some people experience clusters of attacks separated by relatively quiet periods; others develop a more persistent pattern of anticipatory concern and avoidance. Attack frequency can range widely, and frequency by itself is not the diagnostic threshold.
Clinical severity depends on the whole pattern: how intense and unpredictable the attacks are, how much anticipatory fear develops, the degree of avoidance or safety behavior, functional impairment, comorbidity, medical factors, and the effort required to maintain daily life. A person with relatively infrequent attacks can still have substantial impairment if life becomes organized around preventing the next one.
ICD-11 Panic Disorder versus DSM-5-TR
ICD-11 and DSM-5-TR describe closely overlapping Panic Disorder constructs, but they are not word-for-word equivalents. The two systems were deliberately harmonized where possible while retaining different priorities. The comparative analysis by First and colleagues (2021) classifies Panic Disorder among conditions with minor differences driven by greater operational specification in DSM.
The practical differences are important for readers comparing criteria online. DSM uses a fixed symptom threshold for a panic attack and a specified one-month period for persistent concern or maladaptive behavior change. ICD-11 instead describes the rapid onset of several characteristic panic symptoms and persistent post-attack concern or preventive behavior, with “several weeks” offered as clinical guidance rather than a rigid duration criterion. ICD-11 also emphasizes the global clinical pattern and functional impairment.
Neither framework should be reconstructed from the other. An article about ICD-11 should preserve ICD-11 terminology and structure; an article about DSM-5-TR should preserve DSM-5-TR's operational rules. A person should not assume that matching a paraphrased list from one system automatically establishes a diagnosis under the other.
How clinicians apply the ICD-11 requirements
A diagnostic assessment usually begins with a timeline. The clinician asks when the first attack occurred, what happened during it, how quickly symptoms developed, whether similar episodes recurred, whether some were unexpected, what the person feared during and after the attacks, and what changed in daily life afterward.
The assessment then broadens. The clinician examines whether attacks are tied to social scrutiny, phobic objects, trauma reminders, separation, obsessions, illness concerns, generalized worry, mood episodes, substances, medications, sleep disruption, or medical conditions. Functional impact is assessed across work or school, relationships, travel, exercise, sleep, self-care, and other important activities.
For a broader explanation of this process, see How Is Anxiety Diagnosed? Assessment, History, and Differential Diagnosis.
Diagnosis is a clinical synthesis, not a symptom-count exercise
Even when a classification system lists recognizable symptoms, diagnosis requires synthesis. A racing heart can occur in panic, arrhythmia, exercise, fever, hyperthyroidism, stimulant use, or medication effects. Avoidance can occur in panic, agoraphobia, social anxiety, trauma-related disorders, depression, chronic illness, or ordinary risk management. The clinician asks what pattern best explains the whole presentation.
This is consistent with the purpose of the WHO CDDR: it is a clinical manual designed to support qualified professionals in identifying disorders reliably across varied settings, not a self-administered diagnostic quiz. The WHO describes the manual as a clinical version of ICD-11 developed through evidence review and extensive international field testing. See the WHO CDDR publication.
Screening, questionnaires, and online tests do not diagnose ICD-11 Panic Disorder
A screening tool can estimate symptom burden or identify people who may benefit from further assessment. It cannot by itself establish the ICD-11 diagnosis because a score does not determine whether attacks were truly unexpected, whether another disorder better explains them, whether a medical or substance cause is plausible, or whether the required functional threshold is met.
The same rule applies to online checklists and AI-generated symptom matching. Similarity to a diagnostic description can be useful for education and for deciding what to discuss with a clinician. It is not equivalent to a formal diagnostic assessment.
The National Institute of Mental Health overview of Panic Disorder and MedlinePlus diagnostic guidance both describe professional evaluation as broader than a symptom checklist, including attention to physical conditions and other explanations when relevant.
What the ICD-11 diagnosis does and does not mean
A Panic Disorder diagnosis identifies a clinically significant pattern. It does not mean that every bodily sensation is caused by anxiety, that every future episode will be psychiatric, or that the person is in danger whenever panic occurs. It also does not explain the complete causes of the disorder or determine one universally correct treatment.
Conversely, having one or several panic-like symptoms does not establish Panic Disorder. Normal fear, acute stress, another anxiety or fear-related disorder, a trauma-related disorder, a medical condition, medication or substance effects, and other psychiatric conditions can all produce overlapping experiences.
How strong is the evidence behind the ICD-11 framework?
The ICD-11 mental-disorder guidelines were built around clinical utility, cross-cultural applicability, and an evidence-informed description of essential features. In a clinic-based field study across 13 countries, Reed and colleagues reported positive clinician ratings for ease of use, clarity, goodness of fit, level of detail, and usefulness in distinguishing disorders from normality and from other conditions.
For anxiety and fear-related disorders specifically, Rebello and colleagues studied 1,840 mental health professionals using standardized case material in six languages. The ICD-11 guidelines showed diagnostic accuracy and clinical utility that were generally equivalent or superior to ICD-10. The field study also showed that panic-related distinctions can be challenging in borderline cases, reinforcing the need to interpret the full syndrome rather than one symptom.
These studies support the usability of the classification system. They do not show that a webpage, chatbot, or self-test can reproduce a clinical diagnosis. Field testing evaluates professional use of diagnostic guidance under study conditions.
Frequently asked questions about ICD-11 Panic Disorder
What is the ICD-11 code for Panic Disorder?
The ICD-11 code is 6B01. It is classified within anxiety or fear-related disorders.
Does one panic attack mean I have Panic Disorder?
No. A panic attack is an episode, while Panic Disorder is a recurrent clinical pattern. ICD-11 requires recurrent attacks, at least some unexpected attacks, persistent post-attack concern or preventive behavior, functional impairment, and appropriate exclusions.
How many panic symptoms are required in ICD-11?
ICD-11 does not specify a fixed numerical minimum equivalent to the DSM panic-attack count. It describes the rapid concurrent onset of several characteristic symptoms. The complete attack pattern and the broader Panic Disorder requirements matter more than a self-count.
How long must the concern after attacks last?
ICD-11 requires persistent concern, worry, or behavior change and gives several weeks as an example of persistence. It does not impose the DSM-5-TR one-month rule as a formal ICD-11 threshold.
What makes a panic attack “unexpected”?
An unexpected attack is not consistently restricted to a specific feared object, situation, cue, or context. It may seem to occur without a predictable trigger. That does not mean no vulnerability factors or subtle antecedents exist.
Can Panic Disorder and agoraphobia be diagnosed together in ICD-11?
Yes. ICD-11 treats them as separate disorders, and both can be diagnosed when each set of requirements is independently met.
Can someone have panic attacks without Panic Disorder?
Yes. Panic attacks can occur in other mental disorders, in response to specific triggers, during severe stress, and in medical or substance-related contexts. ICD-11 provides a way to record panic attacks in other diagnostic contexts without automatically assigning Panic Disorder.
What is MB23.H?
MB23.H is the ICD-11 code used to record panic attacks as a clinically relevant symptom or qualifier when appropriate. It is different from 6B01, the code for Panic Disorder.
Is “anxiety attack” an ICD-11 diagnosis?
No. “Anxiety attack” is an informal phrase. Panic attacks and Panic Disorder have defined clinical meanings, while other anxiety experiences are classified according to their own patterns.
Can a questionnaire diagnose Panic Disorder?
No questionnaire score by itself establishes the diagnosis. Screening and symptom-severity measures can support assessment, but a diagnosis requires evaluation of the attack pattern, unexpectedness, persistent consequences, impairment, differential diagnoses, and medical or substance factors.
Can chest pain or palpitations safely be assumed to be panic if I have Panic Disorder?
No. A previous Panic Disorder diagnosis does not prove the cause of a new episode. New, severe, unusual, or changing physical symptoms require interpretation in their medical context. Panic and medical illness can coexist.
Is ICD-11 the same as DSM-5-TR for Panic Disorder?
They describe substantially overlapping clinical territory, but their operational wording differs. DSM-5-TR uses more fixed numerical and duration rules; ICD-11 emphasizes essential clinical features and does not reproduce the same fixed symptom-count and one-month thresholds.
Bottom line
ICD-11 Panic Disorder, code 6B01, is a specific longitudinal syndrome. The central picture is recurrent panic attacks, with at least some occurring unexpectedly, followed by persistent concern about additional attacks or their meaning, or by behavior intended to prevent recurrence. The pattern must cause significant functional impairment and must not be better explained by another mental disorder, a medical condition, or substance or medication effects.
The most important diagnostic distinctions are structural: a panic attack is not the same thing as Panic Disorder; panic in another disorder does not automatically create a second diagnosis; agoraphobia has its own requirements; and physical symptom overlap does not establish a psychiatric cause. ICD-11 is designed for clinical judgment within a defined diagnostic framework, not for diagnosis by score or symptom matching.
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References
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