Category · F20-F29 block
F25 — Schizoaffective disorders
Terminology note: "Schizoaffective" does not mean "a little bit of schizophrenia plus a little bit of mood disturbance." It is a specific pattern: prominent psychotic and prominent mood symptoms occurring together, roughly simultaneously, to a clinically significant degree — not any co-occurrence of the two.
What is this category?
F25 describes episodes in which prominent schizophrenic-type symptoms (delusions, hallucinations, thought disorder) and prominent mood symptoms (manic or depressive) are present together, both to a degree that would independently justify a diagnosis on its own terms, occurring roughly simultaneously — whether as a single episode or as part of a recurring pattern; F25 covers both. It sits at the intersection of the psychotic disorders in this block and the mood disorders classified elsewhere, which is exactly why the relative timing and prominence of each symptom cluster is the key skill this category tests.
Core diagnostic concept
The classification question F25 answers is: "are prominent psychotic symptoms and a prominent mood episode occurring together, roughly simultaneously, both to a clinically significant degree, rather than one being secondary, occasional, or merely a reaction to the other?" F25 is about co-equal, simultaneous prominence, not mere co-occurrence.
Key diagnostic features
- Prominent psychotic symptoms
- Delusions, hallucinations, or thought disorder of a type and severity that would support an F20-type classification if considered alone.
- Prominent, simultaneous mood symptoms
- A manic or depressive episode occurring at the same time, severe enough that it would independently warrant a mood-episode diagnosis if the psychotic features were set aside.
- Roughly simultaneous timing
- The two symptom clusters occur together within the same episode, rather than the mood symptoms appearing only before or after the psychotic period, or vice versa.
- A single episode is enough; recurrence is supportive, not required
- When this combination has happened before, that history makes the picture easier to read — but F25 explicitly covers a single episode too. Do not withhold F25 while waiting for a repeat.
- Mood-incongruent or mood-congruent psychotic content is both possible
- Unlike a straightforward mood disorder with psychotic features, F25's psychotic content need not be limited to themes that fit the prevailing mood.
- Prognosis and course typically between F20 and mood disorders
- Course is often episodic, with a prognosis generally regarded as better than F20 alone but with more relapse risk than a mood disorder alone.
How to weigh evidence
These learning labels are teaching aids, not official ICD-10 terminology (see Sources and Method).
- supports Prominent manic symptoms (reduced need for sleep, pressured speech, grandiosity) occurring together with prominent psychotic symptoms (commentary voices, persecutory delusion) within the same episode — this alone is sufficient, even as a first episode.
- consistent not decisive The person appears generally more emotionally reactive or labile than expected during a psychotic episode.
- raises alternative Low mood that appeared only after a psychotic episode had already resolved, understandably in reaction to the experience.
- contradicts or weakens A brief instance of mild mood change accompanying psychosis that does not reach the severity of a full mood episode in its own right.
- missing and necessary to ask Whether the mood symptoms, considered on their own, would be severe and sustained enough to independently justify a manic or depressive episode diagnosis.
Diagnostic boundary
F25 is distinguished from F20 by the presence of prominent, simultaneous, co-equal mood symptoms: in F20, any mood disturbance is usually secondary, occasional, or reactive rather than a full, prominent episode occurring alongside the psychosis. F25 is distinguished from a straightforward mood disorder with psychotic features by breadth and independence of the psychotic symptoms: in F25 the psychotic features are prominent enough, and often broad enough (e.g. mood-incongruent content, characteristic F20-type symptoms), that they would not simply be explained as an embellishment of the mood episode.
Full comparisons:
Duration and course
Minimum duration: F25 does not require a recurring pattern: this category is explicitly meant to cover both a single episode and a recurrent disorder, provided prominent schizophrenic and prominent affective symptoms occur together within the same episode (roughly simultaneously, or within a few days of one another). It is not correct to treat F20's duration expectations for the psychotic component as a substitute for this — F25's defining feature is the co-occurrence itself, not how long the psychotic symptoms alone have lasted. (Editorial note: the precise minimum duration for the co-occurring symptom cluster is not fixed in this pilot's material and should be confirmed by the independent clinical reviewer against the current CDDG edition before this content is approved — see app/content/governance/source-authority.json.)
Course: Course may be a single episode or recurrent; when recurrent, most episodes typically show the same combined psychotic-and-mood pattern. A history of recurrence is supportive context, not a requirement — a single, clear episode with prominent psychotic and affective symptoms together is sufficient on its own.
Included presentations
- An episode combining prominent psychotic symptoms (of a type and severity that would independently support F20) with a prominent, simultaneous manic or depressive episode.
- The same combined pattern recurring across more than one episode over time.
Exclusions and distinguishing presentations
| If this is true instead… | Consider | Why |
|---|---|---|
| Mood disturbance that is only occasional, mild, or clearly secondary to (or a reaction following) an otherwise typical psychotic episode | F20 | F25 should not be used simply because a person with an F20-type illness also appears somewhat low or elated; the mood symptoms must be prominent and simultaneous in their own right. |
| Psychotic symptoms confined to themes that fit the prevailing mood, occurring only within an otherwise clear manic or depressive episode | external capsule | When the psychotic features are mood-congruent and appear only during the mood episode, a mood disorder with psychotic features is generally the better fit than F25. |
| A pattern better explained by a diagnosed organic condition or by substance intoxication or withdrawal | external capsule | Organic and substance-related causes should be checked and, where present, classified under the appropriate category rather than F25. |
External causes to check first
Categories in this block require that the disturbance is not better explained by another external cause listed below. These short capsules are reminders, not full teaching modules.
External cause capsule — Affective disorders with psychotic features
A reminder to check whether psychotic symptoms are confined to, and explained by, a manic or depressive episode, before applying F20 or F25.
What to check:
- Whether psychotic symptoms (e.g. mood-congruent delusions of guilt or grandiosity) appear only during a clearly established manic or depressive episode and resolve as the mood episode resolves.
- Whether mood symptoms clearly preceded the psychotic features, or vice versa.
- Whether the delusional content is mood-congruent (fitting the prevailing mood, e.g. grandiose ideas during mania) rather than the more mood-neutral or bizarre content typical of F20.
- Whether this pattern has recurred across more than one episode, which would raise consideration of F25 rather than a simple mood disorder with psychotic features.
The full F30-F39 category pages (F30, F31, F32, F33) themselves, which cover the severity-and-psychotic-features gradient for manic and depressive episodes in depth; this capsule is a focused reminder of the boundary against F20/F25, not a substitute for those pages.
External cause capsule — Organic or medical causes
A reminder that F20-F29 categories require ruling out an organic brain condition before applying a primary psychiatric classification; this is not a full teaching module on organic mental disorders (see the F00-F09 block, planned).
What to check:
- Onset in the context of a known neurological condition (e.g. epilepsy, stroke, brain tumour, autoimmune encephalitis) or a general medical illness affecting the brain.
- New focal neurological signs, seizures, marked confusion, or fluctuating consciousness accompanying the psychotic features.
- Age of onset outside the usual range for a first psychotic episode, especially later-life onset without a prior psychiatric history.
- Rapid cognitive decline alongside psychotic symptoms.
A full organic-mental-disorder teaching module (F00-F09), which is outside this pilot's scope.
External cause capsule — Substance- or medication-related presentations
A reminder that psychotic symptoms temporally linked to substance use, intoxication, withdrawal, or medication require consideration of a substance-induced explanation before an F20-F29 category is applied.
What to check:
- Timing: did the psychotic symptoms begin during or shortly after intoxication or withdrawal from a psychoactive substance?
- Type of substance: stimulants, cannabis, hallucinogens, alcohol withdrawal, and some prescribed medications (e.g. corticosteroids, certain dopaminergic agents) are recognised in general clinical teaching as capable of producing psychotic symptoms.
- Course after the substance is stopped: substance-induced psychosis typically improves within days to a few weeks of abstinence, though this is not absolute.
- Whether psychotic symptoms were present before any substance use began, which would argue against a purely substance-induced explanation.
A full teaching module on F10-F19 (substance-related disorders), which is on this product's expansion roadmap.
Common learner errors
Worked example — psychosis and mania, together and recurring
Priya, 31, presents with a five-week history of hearing voices commenting on her actions and a fixed belief that colleagues are sabotaging her work, alongside sleeping only two hours a night, talking rapidly, spending money impulsively, and describing herself as having special powers to fix everyone's problems. Her family confirms this combined pattern is new but has recurred twice before over the past three years, each time with similar psychotic and manic features appearing together.
- Step 1 — Check for prominent psychotic symptoms: commentary voices and a persecutory delusion are both present and clearly significant.
- Step 2 — Check for a prominent, simultaneous mood episode: reduced need for sleep, pressured speech, impulsivity, and grandiosity together meet the threshold for a manic episode in their own right, occurring during the same period as the psychotic symptoms.
- Step 3 — Check timing: both symptom clusters are present together in the same five-week period, not one before or after the other.
- Step 4 — Note the supporting history, but recognise it is not what settles the classification: the family's report that this combined pattern has occurred twice before makes the picture easier to read, but F25 does not require recurrence — a single episode with the same simultaneous psychotic-and-manic picture, on its own, would already meet the co-occurrence test in Steps 1-3.
- Conclusion — F25 is best supported: the deciding factor is that prominent psychotic and manic symptoms are present together within this episode; the recurrence is corroborating context, not a requirement.
Interactive practice
- Type A Voices, a persecutory belief, and a manic pattern Recognition / application · Foundation
- Type B Low mood after the voices stopped Boundary / differential · Boundary
- Type C Voices and a mood that's hard to read Insufficient information · Developing
- Type D The mood picture turns out milder than it seemed Progressive revision · Transfer
- Type E Understandably shaken, still schizophrenia Misconception correction · Foundation
- Type F Sorting the evidence — psychosis and mania, weighed together Explanation and evidence selection · Boundary
Retrieval prompts
Try answering each of these from memory before revealing where to check. Nothing you think or type here is sent or saved anywhere.
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What three conditions must all be met for F25 to be the best-supported answer?
Reveal answer location
Check Duration and course, Diagnostic boundary, or the rapid revision card below — the cue you need is one of those, in this category's own already-authored wording.
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Why is 'a person with schizophrenia who also seems a bit low' usually not enough evidence for F25?
Reveal answer location
Check Duration and course, Diagnostic boundary, or the rapid revision card below — the cue you need is one of those, in this category's own already-authored wording.
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Explain why a single episode with clear, simultaneous psychotic and mood symptoms already meets F25's core test, and why a history of recurrence is supportive but not required.
Reveal answer location
Check Duration and course, Diagnostic boundary, or the rapid revision card below — the cue you need is one of those, in this category's own already-authored wording.
These self-checks are a personal study aid only, visible to you on this page for this visit — they are not stored and do not affect your mastery dimensions.
Rapid revision card
F25: Prominent psychotic symptoms and a prominent, simultaneous mood episode occurring together — as a single episode or a recurring pattern.
Decisive boundary cues:
- Mood symptoms only occasional, mild, or reactive to the psychosis -> weighs toward F20 over F25.
- Psychotic content confined to mood-congruent themes within an otherwise clear mood episode -> weighs toward a mood disorder with psychotic features over F25.
- Both symptom clusters prominent and simultaneous within the same episode -> weighs toward F25, even if this is the first such episode; a history of recurrence adds further support but is not required.
Duration/course: No separate duration threshold beyond simultaneity within the episode; a single episode is sufficient on its own, and recurrence, where present, is supportive context rather than a requirement.
Nearest alternatives: F20
Common mistake: Applying F25 whenever any mood disturbance accompanies psychosis, rather than checking whether the mood symptoms are prominent and simultaneous enough to stand as a mood episode in their own right — or, in the other direction, withholding F25 from a genuine first episode while waiting for it to recur, which the category does not require.
Retrieval prompt: Are both the psychotic and mood symptoms prominent and happening at the same time? (A history of recurrence can support this reading but is not required.)
(or use your browser's print function) Open full-page printable revision view →
Related glossary terms
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Psychosis
A general descriptive term for a mental state in which a person's grasp of reality is significantly disturbed — typically through delusions, hallucinations, or marked thought disorder. Psychosis is a feature that can occur across many different categories, not a diagnosis in itself.
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Delusion
A fixed, false belief that is firmly held despite clear evidence to the contrary, and that is not accounted for by the person's cultural or religious background.
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Hallucination
A perceptual experience (in any sensory modality) that occurs without an external stimulus but is experienced as real.
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Affect
The observable expression of emotion (facial expression, tone of voice, gesture) at a given moment, as distinct from mood, which refers to a more sustained emotional state.
Source basis
WHO ICD-10 international classification structure and code/title (ICD-10 Browser, 2019 English release).
Original educational synthesis, informed by general published clinical-education understanding of ICD-10 F25 concepts; no verbatim CDDG or DCR text is reproduced.
Last reviewed: 2026-09-12. Full policy: Sources and Method.
Educational resource only. This page and its cases teach ICD-10 classification reasoning using fictional scenarios. It does not diagnose real people and should not be used to assess yourself or anyone else.