ICD-10 Mood Disorders Guide: F39, F33.1, Depression, Bipolar & Psychiatric Coding
Last Updated in 2026.
If you work in mental health, clinical administration, or psychiatric billing, understanding mood disorder ICD-10 classification is not optional — it is essential. The International Classification of Diseases, 10th Revision (ICD-10), published by the World Health Organization, is the globally accepted diagnostic coding framework used to classify psychiatric and medical conditions. Within its psychiatric chapter, mood (affective) disorders are grouped under codes F30 through F39, covering everything from a single depressive episode to complex bipolar presentations and substance-induced mood disruptions.
Whether you are looking up F39 for an unspecified mood disorder, trying to confirm the correct code for major depressive disorder, or navigating the overlap between mood disorder ICD-10 and comorbid conditions like anxiety, ADHD, or insomnia—this comprehensive guide covers it all. By the end, you will have a clear, clinically grounded understanding of every major category, code, and diagnostic consideration that matters.
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What Is a Mood Disorder? ICD-10 Classification Explained
A mood disorder is a broad diagnostic category that refers to any psychiatric condition in which a person's primary disturbance is in their emotional state or affect. These are not simply "feeling sad" or "feeling too happy"—they represent clinically significant, persistent, and often disabling disruptions in how a person experiences and regulates emotion. The mood disorder ICD-10 classification system provides a structured, standardized way to identify, document, and communicate these conditions across healthcare systems worldwide.
According to the World Health Organization's ICD-10 documentation, mood (affective) disorders fall under Chapter V (F00–F99), which covers mental and behavioral disorders. Within this chapter, the mood disorder block runs from F30 to F39, with each code representing a specific subtype or severity level.
Core ICD-10 Mood Disorder Categories
The ICD-10 mood disorder classification is organized into several core categories, each capturing a distinct clinical profile. F30 covers manic episodes — periods of abnormally elevated mood, energy, and activity. F31 covers bipolar affective disorder, which involves alternating episodes of mania and depression. F32 is used for a single depressive episode, while F33 applies to recurrent depressive disorder, where the person has experienced two or more depressive episodes over their lifetime.
F34 captures persistent mood disorders such as cyclothymia and dysthymia — conditions marked by chronically fluctuating or persistently low mood that does not reach the full severity threshold of a major episode. F38 is reserved for other specified mood disorders, and F39—perhaps the most frequently searched code—is reserved for unspecified mood (affective) disorder.
When coding mood disorders, clinicians and billing specialists must also consider episode specifiers. For example, the ICD-10 distinguishes between mild, moderate, and severe depressive episodes and further differentiates whether psychotic symptoms are present. This level of specificity affects not only diagnostic accuracy but also treatment planning, insurance reimbursement, and medico-legal documentation. Understanding the full mood disorder ICD-10 code structure is therefore critical for psychiatrists, general practitioners, psychologists, and healthcare administrators alike.
The mood disorder coding system under ICD-10 also aligns broadly with the DSM-5 framework published by the American Psychiatric Association, though the two systems are not identical. ICD-10 uses alphanumeric F-codes, and DSM-5 provides more granular diagnostic criteria. In clinical practice in the United States and much of the world, both systems are used in parallel, particularly in settings where insurance billing and diagnostic clarification must coexist.
It is also worth noting that the mood disorder ICD-10 framework is gradually being replaced in some countries by ICD-11, the latest revision. ICD-11 introduces more refined diagnostic distinctions and updated terminology, which we explore later in this guide. However, ICD-10 remains the operational standard across most global healthcare systems as of 2025.
F39 ICD-10 — Unspecified Mood (Affective) Disorder
Featured Snippet: F39 In ICD-10, F39 — Unspecified Mood (Affective) Disorder is assigned when mood symptoms are clearly present and clinically significant, but the available information is insufficient to classify the condition under any other specific mood disorder code in the F30–F38 range.
The F39 ICD-10 code is one of the most frequently used — and sometimes misused — codes in psychiatric billing and documentation. It serves as a diagnostic placeholder or catch-all for situations where the clinical picture does not yet fit neatly into a defined category. This does not mean the patient's condition is minor or vague. Rather, it means that the presenting mood disturbance, while real and impactful, lacks enough diagnostic specificity at the time of coding to warrant a more definitive F-code assignment.
When Is F39 Appropriately Used?
There are several well-recognized clinical contexts where unspecified mood disorder (ICD-10 F39) is the most appropriate code. In emergency psychiatry settings, clinicians often encounter patients in acute distress where the full psychiatric history is unavailable, the patient may be unable to provide a reliable account, and collateral information from family or prior records has yet to be obtained. In these cases, coding with F39 allows the encounter to be documented accurately without forcing a premature diagnostic conclusion.
F39 is also commonly used during the early stages of a diagnostic workup. A patient who presents with irritability, emotional instability, and sleep disruption may ultimately receive a diagnosis of bipolar II disorder, cyclothymia, or a substance-induced mood disorder—but while the evaluation is still underway, F39 preserves diagnostic integrity. Similarly, in transitional care settings where patients are being transferred between providers or levels of care, F39 can serve as a temporary code until the receiving clinician completes a full evaluation.
F39 vs. Other Mood Disorder Codes
It is important to distinguish F39 from F38, which is used for other specified mood disorders. F38 applies when the clinician has enough information to recognize that the condition is a specific type of mood disorder not listed elsewhere in F30–F37 but does not meet the full criteria for any of those categories. F39, by contrast, is used when the clinician genuinely cannot yet classify the disorder — not because it is an unusual presentation, but because the diagnostic information is incomplete.
From a billing and administrative perspective, unspecified mood disorder ICD-10 codes like F39 are acceptable but should not be used indefinitely. Good clinical and coding practice requires that as more diagnostic information becomes available, the code should be updated to the most specific applicable F-code. Continued use of F39 beyond a reasonable evaluation period may be questioned during insurance audits or quality reviews.
For clinicians seeking the most current clinical guidance on mood disorder classification and the use of unspecified codes, the WHO ICD-10 online browser provides the authoritative reference for F39 and all related codes, including their clinical descriptions and inclusion/exclusion notes.
In clinical practice, the distinction between unspecified mood disorder and other F-codes also has implications for treatment. A patient coded under F39 may be placed on observation protocols or monitored with serial assessments before a mood stabilizer or antidepressant is initiated, whereas a patient with a confirmed F33.1 (moderate recurrent depression) may proceed directly to a structured treatment algorithm. Understanding the mood disorder ICD-10 framework therefore supports both accurate coding and better patient outcomes.
ICD-10 Depression Codes: F32, F33, and F33.1 Explained
Depression is the most prevalent mood disorder globally, and the mood disorder ICD-10 system provides a highly structured set of codes for its documentation. The two primary code blocks for depressive conditions are F32 (depressive episode) and F33 (recurrent depressive disorder). Understanding the difference between these—and when to use each—is fundamental to accurate psychiatric coding.
F32 — Depressive Episode (Single)
The F32 code block is used when a patient is experiencing their first-ever depressive episode, with no prior history of mania or recurrent depression. It is further subdivided by severity. F32.0 indicates a mild depressive episode, typically characterized by two or three depressive symptoms with minimal functional impairment. F32.1 represents a moderate depressive episode, where the patient experiences four or more symptoms and has notable difficulty continuing with work, social activities, or domestic responsibilities. F32.2 is used for a severe depressive episode without psychotic features, while F32.3 applies when severe depression is accompanied by hallucinations, delusions, or depressive stupor.
F33 — Recurrent Depressive Disorder
The F33 block applies when a patient has experienced two or more depressive episodes separated by a period of recovery—typically at least two months without significant mood symptoms. Like F32, it is subdivided by severity. F33.0 is recurrent depressive disorder, current episode mild. F33.1 — one of the most clinically significant codes — represents recurrent depressive disorder, current episode moderate.
What Are the Symptoms of F33.1?
F33.1 — Recurrent Depressive Disorder, Current Episode Moderate
Clinical features typically include:
• Persistent low or depressed mood lasting most of the day, nearly every day
• Loss of interest or pleasure in activities previously enjoyed (anhedonia)
• Significant fatigue or loss of energy
• Impaired concentration, attention, or decision-making ability
• Sleep disturbances — either insomnia or hypersomnia
• Psychomotor agitation or retardation observable by others
• Changes in appetite or weight (decrease or increase)
• Feelings of worthlessness or excessive guilt
• Recurrent thoughts of death or suicidal ideation (without a plan or attempt)
The "moderate" qualifier in F33.1 means that these symptoms are present to a degree that is clearly beyond a mild presentation but does not reach the threshold of severe depression. The patient is significantly impaired in social and occupational functioning but is typically still able to manage basic self-care activities. Clinicians often use validated rating instruments such as the PHQ-9 or Hamilton Depression Rating Scale to quantify severity and support the F33.1 designation.
What Is the Diagnosis Code for Major Depressive Disorder?
In ICD-10 terminology, the concept closest to DSM-5's "Major Depressive Disorder" (MDD) is captured across the F32 and F33 blocks, depending on episode history. A single episode of major depression maps most closely to F32.1 (moderate) or F32.2 (severe without psychosis). Recurrent MDD maps to F33.1 (moderate) or F33.2 (severe without psychosis). For clinicians in the United States using the ICD-10-CM (Clinical Modification), codes such as F33.1 are commonly listed on insurance claims for recurrent moderate major depression.
For an in-depth clinical reference on depression severity and coding, the National Institute of Mental Health (NIMH) depression resource provides evidence-based information on diagnosis, epidemiology, and treatment approaches aligned with ICD-10 and DSM-5 frameworks.
Bipolar Disorder ICD-10 Codes: The F31 Spectrum
Bipolar disorder is classified in ICD-10 under F31, covering a spectrum of presentations that involve both manic and depressive episodes. The ICD-10 bipolar disorder code block is nuanced, with each subcode specifying the current episode type and its severity, which is essential for clinical documentation and insurance billing.
F31 Bipolar Disorder Subcodes:
F31.0 — Bipolar affective disorder, current episode hypomanic
F31.1 — Current episode manic without psychotic symptoms
F31.2 — Current episode manic with psychotic symptoms
F31.3 — Current episode mild or moderate depression
F31.4—Current episode severe depression without psychosis
F31.5 — Current episode severe depression with psychotic symptoms
F31.6 — Current episode mixed state
F31.7 — Currently in remission
F31.9 — Bipolar affective disorder, unspecified
It is important to note that ICD-10 does not have a separate code for "bipolar II disorder" as defined in DSM-5. Bipolar II—characterized by hypomanic (not full manic) episodes and major depressive episodes—is generally coded under F31.0 (hypomanic episode) or F31.3 (current depressive episode) depending on the phase, sometimes supplemented with clinical notes. For the most current ICD-10 coding guidance in clinical settings, the Centers for Medicare & Medicaid Services (CMS) ICD-10 resource page provides up-to-date code sets and billing guidelines.
Substance-Induced Mood Disorder ICD-10
Substance-induced mood disorder ICD-10 coding addresses mood disturbances that are directly attributable to the physiological effects of a substance—whether from intoxication, withdrawal, or chronic use. These are important to distinguish from primary mood disorders because the clinical management and treatment approach differ significantly.
In ICD-10, substance-induced mood disorders do not have a single dedicated code. Instead, they are captured within the F10–F19 substance use disorder blocks, using a fifth character to specify the mental disorder type. The approach is therefore substance-first: you identify the substance, then specify the associated mental or behavioral disorder.
Key Substance-Induced Mood Disorder Codes:
F10.14 / F10.24 — Alcohol-induced mood disorder (harmful use / dependence)
F12.x — Cannabis-induced mood disorder
F15.x — Stimulant-induced mood disorder
F19.x — Mood disorder due to multiple or unspecified substances
Cannabis-induced mood disorder ICD-10 is an increasingly relevant code given shifting patterns of cannabis use globally. Clinicians must document that the mood episode developed during or shortly after cannabis intoxication or withdrawal and that the mood symptoms are in excess of what would be expected from the intoxication alone. Similarly, alcohol-induced mood disorder ICD-10 coding requires that the mood disturbance began during alcohol use or withdrawal and is not better explained by a preexisting primary mood disorder.
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Psychiatric Comorbidity ICD-10 Codes
Mood disorders rarely occur in isolation. In clinical practice, they are frequently accompanied by anxiety disorders, ADHD, insomnia, impulse control disorders, and substance use disorders. Accurate mood disorder ICD-10 documentation requires that comorbid conditions be coded alongside the primary mood disorder diagnosis.
Common Comorbid ICD-10 Codes:
F41.9 — Anxiety disorder, unspecified (ICD-10 anxiety unspecified)
F90.9 — Attention deficit hyperactivity disorder, unspecified (ICD-10 ADHD)
G47.0 — Insomnia (ICD-10 insomnia)
F10.1–F10.9 — Alcohol-related disorders (ICD-10 alcohol abuse)
F63.x — Impulse control disorders (ICD-10 impulse control disorder)
F41.0 — Panic disorder
F43.1 — Post-traumatic stress disorder (PTSD)
When documenting comorbid conditions, it is important to code each condition separately unless the ICD-10 guidelines explicitly specify a combination code. For example, a patient with F33.1 (recurrent moderate depression) and F41.9 (unspecified anxiety) should have both codes listed. This is particularly important in outpatient billing, where code specificity affects reimbursement rates and quality metrics. The National Alliance on Mental Illness (NAMI) depression guide provides patient-accessible information on depression comorbidities that can help clinicians in psychoeducation alongside formal coding work.
Mood Disorder With Psychosis ICD-10
When a mood disorder is accompanied by psychotic features — hallucinations, delusions, or severe thought disorganization — the coding must reflect this added dimension of severity. Mood disorders with psychosis ICD-10 presentations are most commonly coded under the severe episode subcodes.
For depressive episodes with psychosis, the relevant codes are F32.3 (single severe depressive episode with psychotic symptoms) and F33.3 (recurrent severe depressive disorder with psychotic symptoms). For bipolar disorder with psychotic features, the appropriate code is F31.2 (manic episode with psychotic symptoms) or F31.5 (depressive episode with psychotic symptoms in bipolar context).
These codes have significant clinical and administrative implications. Patients coded with psychotic mood disorders typically require more intensive monitoring, are more likely to require inpatient admission, and are often treated with a combination of mood-stabilizing and antipsychotic medications. From a billing perspective, psychotic specifiers may affect authorization requirements and level-of-care justifications.
Dementia With Mood Disorder ICD-10
The intersection of dementia and mood disorders is a growing clinical concern, particularly in aging populations. Dementia with mood disorder ICD-10 coding uses the dementia block (F01–F03) as the primary code, with mood symptoms typically coded as comorbid features.
Dementia ICD-10 Codes:
F01 — Vascular dementia
F02 — Dementia in other diseases classified elsewhere
F03 — Unspecified dementia
Mood disturbances in dementia — including depressive episodes, emotional lability, and apathy — are often coded as comorbid diagnoses using the appropriate F32/F33/F39 codes. In some cases, behavioral and psychological symptoms of dementia (BPSD) may be captured using F06.3 (organic mood disorder), which specifically addresses mood disturbances caused by an identifiable organic brain disorder, including dementia. Clinicians should consult with certified clinical coders when managing complex dementia-plus-mood-disorder presentations to ensure compliance with ICD-10 combination coding rules.
Episodic Mood Disorder ICD-10
The concept of episodic mood disorder in the ICD-10 reflects the fundamentally episodic nature of many mood conditions. Unlike personality disorders or anxiety conditions that may be chronic and persistent, many mood disorders — particularly bipolar disorder and recurrent depression — are characterized by discrete episodes that alternate with periods of relative wellness.
ICD-10 captures this episodicity through its code structure. The F31 (bipolar) block, for example, explicitly codes the current episode type and severity, reflecting that the patient's presentation at any given clinical encounter represents one phase of a broader episodic condition. This approach is clinically valuable because it allows treatment teams to track episode patterns over time, identify triggers, and anticipate future episodes.
For patients in remission between episodes, ICD-10 provides the option to code the mood disorder in remission using the ".7" specifier in the F31 block (F31.7 for bipolar in remission) or similar specifiers in the F33 block. This supports continuity of care documentation and ensures that the patient's history is preserved even when they are currently asymptomatic.
ICD-10 Codes for Mood Changes and Unspecified Conditions
Beyond formal mood disorder diagnoses, clinicians sometimes encounter patients who present with mood changes that do not yet meet the threshold for a diagnosable condition. The ICD-10 code for mood changes unspecified is most accurately represented by F39 (unspecified mood affective disorder) when the changes are clinically significant or, alternatively, by symptom codes such as R45.8 (other symptoms and signs involving emotional state) for subclinical presentations.
The distinction matters: F39 implies a clinical judgment that a mood disorder is present but cannot yet be specified, while R45.8 is a symptom code used when mood changes are noted but the clinician has not yet concluded that a psychiatric disorder is present. Both have legitimate uses, and the choice between them should reflect the clinician's actual diagnostic impression at the time of the encounter.
The Five Major Mood Disorders
When clinicians and patients ask, "What are the five mood disorders?" they are typically referring to the five most clinically recognized mood disorder categories. While ICD-10 organizes these across multiple codes, the five core conditions are
1. Major Depressive Disorder (MDD) — Characterized by one or more major depressive episodes with no history of mania or hypomania. Coded under F32 (single episode) or F33 (recurrent) in ICD-10.
2. Bipolar I Disorder — Characterized by at least one full manic episode, often accompanied by depressive episodes. Coded under F31 in ICD-10, with specific subcodes for the current episode.
3. Bipolar II Disorder — Characterized by hypomanic episodes (less severe than full mania) and major depressive episodes, with no full manic episodes. Coded within the F31 spectrum in ICD-10, often using F31.0 or F31.3 depending on the current phase.
4. Cyclothymic Disorder — A chronic, fluctuating mood disturbance involving numerous periods of hypomanic symptoms and depressive symptoms that do not meet the full criteria for a major episode. Coded under F34.0 in ICD-10.
5. Persistent Depressive Disorder (Dysthymia) — A chronically depressed mood lasting at least two years (one year in children and adolescents), with symptom severity below that of a major depressive episode. Coded under F34.1 (dysthymia) in ICD-10.
Mood Disorder ICD-11: What Has Changed?
The mood disorder ICD-11 classification system, released by the WHO in 2022 and progressively adopted globally, introduces several important changes compared to ICD-10. While ICD-10 groups all mood disorders under the broad F30–F39 block, ICD-11 reorganizes them into two distinct top-level categories: depressive disorders and bipolar or related disorders.
In ICD-11, depressive disorders now include major depression (single and recurrent episodes), dysthymia, and mixed depressive and anxiety disorder—a new addition that acknowledges the high co-occurrence of anxiety and depression. Bipolar disorders are more clearly stratified into bipolar I, bipolar II, and cyclothymia, with explicit diagnostic criteria for each.
The ICD-11 also introduces dimensional severity specifiers—allowing clinicians to rate symptom severity on a continuum rather than in rigid categorical thresholds. This represents a significant conceptual shift toward a more nuanced, patient-centered diagnostic approach. For organizations transitioning from ICD-10 to ICD-11, understanding the crosswalks between old and new codes is essential to maintaining billing continuity and data integrity.
For a detailed overview of the ICD-11 transition, the WHO ICD-11 reference platform offers comprehensive browsable documentation, including code comparisons, clinical descriptions, and implementation guidance for health systems worldwide.
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Authoritative References
1. World Health Organization — ICD-10 Classification of Mental and Behavioral Disorders:
https://www.who.int/standards/classifications/classification-of-diseases
2. WHO ICD-10 Online Browser — F30–F39 Mood Disorders:
https://icd.who.int/browse10/2019/en#/F30-F39
3. WHO ICD-11 Reference Platform:
https://icd.who.int/en
4. American Psychiatric Association — DSM-5:
https://www.psychiatry.org/psychiatrists/practice/dsm
5. National Institute of Mental Health — Depression:
https://www.nimh.nih.gov/health/topics/depression
6. Centers for Medicare & Medicaid Services — ICD-10 Codes:
https://www.cms.gov/medicare/coding-billing/icd-10-codes
7. National Alliance on Mental Illness — Depression:
https://www.nami.org/About-Mental-Illness/Mental-Health-Conditions/Depression