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Chapter 5: Mental, behavioral and neurodevelopmental disorders (F01–F99)

Mental health and developmental conditions: depression, anxiety, schizophrenia, bipolar disorder, substance use disorders, autism, ADHD and dementia-related conditions.

Chapter 5 spans codes F01–F99 in the FY2027 ICD-10-CM tabular list. This guide explains 35 of its most common codes — select a code for its official description, a plain-English explanation and a note on when the code is used.

ICD-10 Chapter 5: Mental, Behavioral & Neurodevelopmental — illustrative image

Codes in this chapter

CodeOfficial descriptionIn plain words
F03.90Unspecified dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxietyDementia is a decline in memory and thinking severe enough to affect daily life, here without a specified cause or behavioural features.
F10.10Alcohol abuse, uncomplicatedAlcohol abuse means a pattern of drinking that causes harm or problems, without physical dependence being documented.
F10.20Alcohol dependence, uncomplicatedAlcohol dependence is a strong craving and loss of control over drinking, with tolerance and withdrawal features.
F11.10Opioid abuse, uncomplicatedOpioid abuse is a harmful pattern of using opioid drugs such as heroin or prescription painkillers.
F11.20Opioid dependence, uncomplicatedOpioid dependence is loss of control over opioid use, with craving, tolerance and withdrawal.
F12.20Cannabis dependence, uncomplicatedCannabis dependence is a pattern of cannabis use with craving and difficulty cutting down despite harm.
F14.20Cocaine dependence, uncomplicatedCocaine dependence is loss of control over cocaine use, with craving and continued use despite harm.
F15.20Other stimulant dependence, uncomplicatedDependence on other stimulant drugs, such as amphetamines, with craving and loss of control over use.
F17.210Nicotine dependence, cigarettes, uncomplicatedNicotine dependence in a person who smokes cigarettes: craving, tolerance and difficulty quitting.
F20.9Schizophrenia, unspecifiedSchizophrenia is a long-term mental health condition affecting thinking, perception and behaviour, often with hallucinations or delusions.
F22Delusional disordersDelusional disorder involves fixed false beliefs (delusions) without the broader features of schizophrenia.
F25.9Schizoaffective disorder, unspecifiedSchizoaffective disorder combines symptoms of schizophrenia with episodes of mania or depression.
F31.81Bipolar II disorderBipolar II disorder causes episodes of depression and hypomania (a milder form of mania).
F31.9Bipolar disorder, unspecifiedBipolar disorder causes episodes of mania (or hypomania) and depression affecting mood, energy and activity.
F32.1Major depressive disorder, single episode, moderateA single moderate episode of major depression: persistent low mood, loss of interest and reduced energy affecting daily life.
F32.ADepression, unspecifiedDepression is a common mental health condition of persistent low mood and loss of interest or pleasure.
F33.1Major depressive disorder, recurrent, moderateRecurrent depressive disorder of moderate severity: repeated episodes of depression over time.
F33.2Major depressive disorder, recurrent severe without psychotic featuresRecurrent depressive disorder of severe degree, without psychotic symptoms.
F34.1Dysthymic disorderDysthymia (persistent depressive disorder) is a long-lasting, lower-grade depressed mood lasting two years or more.
F40.10Social phobia, unspecifiedSocial anxiety disorder is an intense fear of social situations and being judged by others.
F41.0Panic disorder [episodic paroxysmal anxiety]Panic disorder causes recurrent sudden attacks of intense fear with palpitations, breathlessness and a sense of dread.
F41.1Generalized anxiety disorderGeneralised anxiety disorder is persistent, excessive worry about everyday matters that is hard to control.
F41.9Anxiety disorder, unspecifiedAnxiety disorder is a condition of excessive anxiety or worry; here the specific type is not recorded.
F42.9Obsessive-compulsive disorder, unspecifiedObsessive-compulsive disorder (OCD) involves intrusive unwanted thoughts and repetitive behaviours performed to relieve anxiety.
F43.10Post-traumatic stress disorder, unspecifiedPost-traumatic stress disorder (PTSD) can follow a traumatic event, causing flashbacks, avoidance and heightened alertness.
F43.21Adjustment disorder with depressed moodAn adjustment disorder is a strong emotional reaction to a life change or stressor, here mainly with depressed mood.
F43.23Adjustment disorder with mixed anxiety and depressed moodAn adjustment disorder with both anxiety and depressed mood following a stressful life event.
F50.9Eating disorder, unspecifiedAn eating disorder is a disturbed pattern of eating and weight concern; the specific type is not recorded here.
F51.01Primary insomniaPrimary insomnia is persistent difficulty falling or staying asleep not caused by another medical or mental condition.
F60.3Borderline personality disorderBorderline personality disorder is a pattern of unstable relationships, self-image and emotions, with impulsivity.
F80.9Developmental disorder of speech and language, unspecifiedA developmental disorder of speech and language in childhood, affecting understanding or expression of language.
F84.0Autistic disorderAutism (autistic disorder) is a neurodevelopmental condition affecting social communication and behaviour patterns.
F90.2Attention-deficit hyperactivity disorder, combined typeAttention-deficit/hyperactivity disorder, combined type: both inattention and hyperactivity-impulsivity are present.
F90.9Attention-deficit hyperactivity disorder, unspecified typeAttention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental condition of inattention and/or hyperactivity and impulsivity.
F91.3Oppositional defiant disorderOppositional defiant disorder is a childhood pattern of angry, argumentative and defiant behaviour toward authority figures.

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.

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