Diagnostic Criteria for Obsessive-Compulsive Disorder (OCD)

Core Diagnostic Features

The diagnosis of Obsessive-Compulsive Disorder requires the presence of obsessions and/or compulsions that are time-consuming (taking >1 hour per day) or cause clinically significant distress or impairment in functioning, as recommended by the American Psychiatric Association 1
Recurrent and persistent thoughts, urges, or impulses experienced as intrusive and unwanted, causing marked anxiety or distress in most individuals, are a key feature of OCD, according to the International OCD Foundation 1, 2
The individual attempts to ignore, suppress, or neutralize these thoughts with some other thought or action (performing a compulsion), as noted by the National Institute of Mental Health 1, 2
Repetitive behaviors (e.g., hand washing, ordering, checking) or mental acts (e.g., praying, counting, repeating words silently) that the individual feels driven to perform, are characteristic of OCD, as described by the American Psychological Association 1, 2
These behaviors or mental acts are performed in response to an obsession or according to rules that must be applied rigidly, and are aimed at preventing/reducing anxiety or distress, or preventing a dreaded event, but are not realistically connected to what they are designed to neutralize or prevent, or are clearly excessive, as stated by the World Health Organization 1, 3

Obsessions or compulsions must be time-consuming (taking >1 hour per day), as specified by the Diagnostic and Statistical Manual of Mental Disorders 4, 5
Must cause clinically significant distress or impairment in social, occupational, or other important areas of functioning, as required by the International Classification of Diseases 4, 5

Symptoms are not attributable to physiological effects of a substance (drug of abuse, medication) or another medical condition, as excluded by the American Medical Association 1, 4
The disturbance is not better explained by symptoms of another mental disorder, as distinguished by the National Alliance on Mental Illness 1, 4

With good or fair insight: individual recognizes OCD beliefs are definitely or probably not true, or may or may not be true, as specified by the American Psychiatric Association 4, 5
With poor insight: individual thinks OCD beliefs are probably true, as noted by the International OCD Foundation 4, 5
With absent insight/delusional beliefs: individual is completely convinced OCD beliefs are true, as described by the National Institute of Mental Health 4, 5

Normal intrusive thoughts and repetitive behaviors are common but don't meet criteria for OCD unless they are time-consuming (>1 hour daily) or cause significant distress/impairment, as distinguished by the American Psychological Association 5, 6
Must be distinguished from other obsessive-compulsive related disorders (OCRD) such as body dysmorphic disorder, hoarding disorder, trichotillomania, and excoriation disorder, as classified by the World Health Organization 5, 6
Differs from generalized anxiety disorder and depression where worries/ruminations are typically about real-life concerns and less irrational/ego-dystonic than in OCD, as noted by the National Alliance on Mental Illness 5
Must be distinguished from psychotic disorders - individuals with OCD typically maintain insight about their symptoms, though insight may vary, as stated by the American Psychiatric Association 1, 5

Yale-Brown Obsessive Compulsive Scale (Y-BOCS) is the gold standard for measuring OCD symptom severity, as recommended by the International OCD Foundation 7
Y-BOCS scores ≥28 (or ≥14 if only obsessions or only compulsions are present) indicate severe OCD, as specified by the National Institute of Mental Health 4, 7

Pediatric cases may present differently - young children may not be able to articulate the aims of their behaviors or mental acts, as noted by the American Academy of Pediatrics 4
Pediatric autoimmune neuropsychiatric disorders associated with Streptococcus (PANDAS) represents a subtype characterized by sudden onset of obsessive-compulsive symptoms following streptococcal infection, as described by the National Institute of Mental Health 1, 8
Neurological conditions affecting the basal ganglia (e.g., Sydenham chorea) can present with obsessive-compulsive symptoms, as stated by the World Health Organization 1

Avoid misdiagnosing OCD with absent insight as a psychotic disorder, which could lead to inappropriate treatment, as warned by the American Psychiatric Association 5
Be aware that OCD symptoms often fall into specific symptom dimensions that tend to remain stable within individuals, as noted by the International OCD Foundation 5
Males are more likely to have early-onset OCD (before puberty) and comorbid tics, as reported by the National Institute of Mental Health 5

Clinicians must confirm that obsessive‑compulsive symptoms are not attributable to the physiological effects of substances (e.g., drugs of abuse, medications) or to any medical condition, and must ensure the presentation is not better explained by other mental disorders such as generalized anxiety disorder, major depressive disorder, autism spectrum disorder, or psychotic disorders【9】.

When assessing pediatric OCD, clinicians should document any current or past history of a tic disorder. This specifier is relevant because early‑onset OCD, particularly in males, frequently co‑occurs with tics and may influence therapeutic choices【9】.

Young adolescents may struggle to articulate the purpose of their compulsive behaviors or mental acts; therefore, clinicians should use developmentally appropriate, specific diagnostic questions to probe intrusive thoughts and mental compulsions【9】.

The Children’s Yale‑Brown Obsessive‑Compulsive Scale (CY‑BOCS) is the recommended tool for quantifying symptom severity in children and adolescents.