Quick Answer: F-codes are the ICD-10 diagnosis codes most commonly used for mental and behavioral health billing, and many map directly to DSM-5-TR diagnoses. Therapists should select the code that best fits the client’s documented condition, support it with assessment details and functional impairment, and verify payer requirements before submission.
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What are F-codes and why therapists use them
In clinical billing, “F-codes” usually refers to the ICD-10-CM chapter F00–F99: Mental, Behavioral and Neurodevelopmental Disorders. These are the diagnosis codes most therapists use for psychotherapy claims, treatment plans, and medical necessity documentation. For many payers, the ICD-10 code is the billable diagnosis on the claim, while DSM-5-TR terminology guides the clinical formulation in the chart.
That distinction matters. The diagnosis you choose must reflect the client’s current presentation, the level of impairment, and the service being provided. A payer is not looking for a textbook write-up; they are looking for a diagnosis that supports the billed service, such as individual psychotherapy, family psychotherapy, psychological testing, or psychiatric evaluation. If you need a refresher on progress note structure, see our progress notes guide and SOAP notes guide.
Therapists often use F-codes to communicate both diagnosis and billing justification. For example, a client with recurrent panic attacks and avoidance may be documented under panic disorder with corresponding ICD-10 code F41.0. A client with severe depressive symptoms after a major loss may be coded differently depending on whether the presentation meets criteria for major depressive disorder, adjustment disorder, or prolonged grief disorder. Accurate coding is not just administrative; it shapes authorization decisions, claim acceptance, and the clinical story in the record.
50 most-used F-codes for therapy billing
Below are 50 commonly used mental health F-codes therapists may encounter in outpatient psychotherapy, assessment, and psychiatry-adjacent documentation. Use them only when they accurately fit the client’s diagnosis and your documentation supports that selection. Always verify payer-specific covered diagnoses and consult the most current ICD-10-CM manual when in doubt.
| ICD-10 F-code | Common diagnosis name | Clinical use note |
|---|---|---|
| F20.9 | Schizophrenia, unspecified | Used when schizophrenia is diagnosed without a more specific subtype or detail. |
| F22 | Delusional disorders | Appropriate for persistent delusions without prominent schizophrenia symptoms. |
| F25.9 | Schizoaffective disorder, unspecified | Use when mood and psychotic symptoms are both present and criteria are met. |
| F28 | Other psychotic disorder not due to a substance or known physiological condition | Use for psychotic presentations that do not fit schizophrenia-spectrum specifics. |
| F29 | Unspecified psychosis not due to a substance or known physiological condition | A fallback only when the chart does not yet support a more specific diagnosis. |
| F30.9 | Manic episode, unspecified | Used when mania is present but details are limited. |
| F31.9 | Bipolar disorder, unspecified | Common early in treatment before full bipolar subtype clarification. |
| F31.32 | Bipolar disorder, current episode depressed, moderate | Use when the depressive phase is the current episode and severity is moderate. |
| F31.4 | Bipolar disorder, current episode depressed, severe, without psychotic features | Requires documentation of severe symptoms and absence of psychosis. |
| F31.5 | Bipolar disorder, current episode depressed, severe, with psychotic features | Use only when psychotic features are clinically supported. |
| F31.81 | Bipolar II disorder | Common in outpatient psychotherapy when hypomania and major depression are documented. |
| F32.0 | Major depressive disorder, single episode, mild | Use when full MDD criteria are met with mild severity. |
| F32.1 | Major depressive disorder, single episode, moderate | A frequent psychotherapy billing diagnosis when functional impairment is present. |
| F32.2 | Major depressive disorder, single episode, severe without psychotic features | Use for severe depressive syndrome without psychosis. |
| F32.3 | Major depressive disorder, single episode, severe with psychotic features | Requires evidence of psychotic symptoms during the depressive episode. |
| F32.A | Depression, unspecified | Used sparingly when depressive symptoms are documented but not enough for a specific MDD diagnosis. |
| F33.0 | Major depressive disorder, recurrent, mild | Recurrent pattern with mild current severity. |
| F33.1 | Major depressive disorder, recurrent, moderate | One of the most common outpatient therapy diagnoses. |
| F33.2 | Major depressive disorder, recurrent, severe without psychotic features | Use when severe symptoms recur and psychosis is absent. |
| F33.3 | Major depressive disorder, recurrent, severe with psychotic features | For severe recurrent depression with psychotic features. |
| F40.00 | Agoraphobia without panic disorder | Use when avoidance of places/situations is primary without panic disorder. |
| F40.01 | Agoraphobia with panic disorder | Use when agoraphobic avoidance is paired with panic disorder. |
| F40.10 | Social phobia, unspecified | Often used when social anxiety is present but subtype is not specified. |
| F40.11 | Social phobia, generalized | Appropriate for pervasive fear across most social situations. |
| F40.218 | Specific phobia, other type | Use for phobias that do not fit animal, natural environment, blood-injection-injury, situational, or other categories. |
| F40.228 | Specific phobia, other | A valid option for specific phobias outside the named subtypes. |
| F41.0 | Panic disorder [episodic paroxysmal anxiety] | Very common in outpatient and telehealth psychotherapy claims. |
| F41.1 | Generalized anxiety disorder | One of the highest-frequency therapy billing codes overall. |
| F41.3 | Other mixed anxiety disorders | Use when anxiety symptoms are clinically significant but do not fit a single anxiety disorder. |
| F41.8 | Other specified anxiety disorders | Appropriate when the clinician specifies the presentation in the chart. |
| F41.9 | Anxiety disorder, unspecified | Use only if the assessment does not support a more specific diagnosis. |
| F42 | Obsessive-compulsive disorder | Use when obsessions and compulsions meet OCD criteria. |
| F43.10 | Post-traumatic stress disorder, unspecified | A valid PTSD code when the subtype/specifiers are not documented on the claim. |
| F43.11 | Post-traumatic stress disorder, acute | Use when symptom duration is less than three months, if supported by the record. |
| F43.12 | Post-traumatic stress disorder, chronic | Use for PTSD with symptoms persisting three months or longer. |
| F43.20 | Adjustment disorder, unspecified | Broad code, but still requires a clear stressor-related picture. |
| F43.21 | Adjustment disorder with depressed mood | Common when loss or stress triggers depressive symptoms that do not meet MDD criteria. |
| F43.22 | Adjustment disorder with anxiety | Use for stress-triggered anxiety when criteria for an anxiety disorder are not met. |
| F43.23 | Adjustment disorder with mixed anxiety and depressed mood | A very common outpatient counseling diagnosis. |
| F43.24 | Adjustment disorder with disturbance of conduct | Useful when behavioral dysregulation is the primary reaction to stress. |
| F43.25 | Adjustment disorder with mixed disturbance of emotions and conduct | Use when both emotional and behavioral symptoms are clinically significant. |
| F43.29 | Adjustment disorder, unspecified type | Fallback when a specific adjustment code is not supported. |
| F50.00 | Anorexia nervosa, unspecified | Use with caution and only when clinically supported; often involves medical coordination. |
| F50.01 | Anorexia nervosa, restricting type | Appropriate when restrictive behaviors are documented. |
| F50.02 | Anorexia nervosa, binge eating/purging type | Use when restriction plus binge/purge behaviors are present. |
| F50.2 | Bulimia nervosa | A classic eating-disorder billing diagnosis requiring careful assessment. |
| F50.81 | Binge eating disorder | Common in psychotherapy when recurrent binge episodes are documented. |
| F50.89 | Other eating disorders | Use for clinically significant eating pathology that does not fit the more specific codes. |
| F51.01 | Primary insomnia | Often used by therapists when insomnia is the treatment focus and is not due to another disorder. |
| F51.05 | Insomnia due to other mental disorder | Use when insomnia is tied to a diagnosed psychiatric condition. |
| F60.3 | Borderline personality disorder | Requires careful, behaviorally specific documentation and longitudinal pattern evidence. |
| F60.6 | Avoidant personality disorder | Use when pervasive avoidance and social inhibition are longstanding. |
| F63.0 | Pathological gambling | Used in behavioral addiction and impulse-control documentation. |
| F90.0 | Attention-deficit hyperactivity disorder, predominantly inattentive type | Common in therapy and assessment-adjacent charts when inattentive symptoms predominate. |
| F90.1 | Attention-deficit hyperactivity disorder, predominantly hyperactive type | Use when hyperactivity/impulsivity is the main presentation. |
| F90.2 | Attention-deficit hyperactivity disorder, combined type | Frequently used when both inattentive and hyperactive symptoms are documented. |
| F91.3 | Oppositional defiant disorder | A common child/adolescent code when defiant and argumentative behavior is persistent. |
| F91.8 | Other conduct disorders | Use when conduct problems are clinically significant but not fully captured by another conduct code. |
| F94.1 | Reactive attachment disorder | Relevant in specialty child and family settings with documented early neglect/attachment disturbance. |
| F94.2 | Disinhibited social engagement disorder | Use when indiscriminate sociability is the core presentation. |
| F98.0 | Enuresis not due to a substance or known physiological condition | Used when elimination issues are treated in behavioral health and medical causes are excluded. |
| F98.1 | Encopresis not due to a substance or known physiological condition | Requires careful differential with medical evaluation as appropriate. |
| F98.2 | Feeding disorder of infancy and childhood | Relevant in pediatric behavioral health and interdisciplinary care. |
| F98.4 | Stereotyped movement disorders | May be used when repetitive nonfunctional motor behavior is clinically documented. |
| F98.8 | Other specified behavioral and emotional disorders with onset usually occurring in childhood and adolescence | A common “other specified” code when the clinician names the presentation in the chart. |
Some therapists prefer to keep a short internal cheat sheet by diagnosis family. For practical documentation workflows, pair this list with note templates such as DAP notes, BIRP notes, or progress notes so that the diagnosis, symptom data, and intervention match cleanly.
How to document diagnosis selection correctly
Diagnosis coding should follow the clinical evidence in the chart, not the easiest code to get a claim out the door. The best therapist documentation connects symptoms, duration, severity, functional impairment, and risk. If you are documenting F41.1 Generalized anxiety disorder, for example, the note should show excessive worry across domains, difficulty controlling the worry, associated symptoms, and meaningful impairment in work, relationships, sleep, or concentration.
When a payer reviews a claim, they may not read the whole chart, but the chart must still demonstrate medical necessity. That usually means documenting: the presenting problem, relevant history, mental status findings, diagnosis rationale, treatment plan, and progress toward goals. This is especially important for higher-intensity CPT codes such as 90837 for 60-minute psychotherapy, 90834 for 45-minute psychotherapy, 90847 for family psychotherapy with the patient present, and 90853 for group psychotherapy. The diagnosis should support why the service was needed and what clinical work occurred.
Use specifiers and severity details when the code allows it. For instance, F32.1 is not interchangeable with F32.0; the moderate versus mild distinction should be anchored in symptom burden and impairment. Similarly, F43.12 is more accurate than F43.10 when the duration and course support chronic PTSD. If the presentation is still evolving, an unspecified code may be temporary, but it should not become the default forever.
| Documentation element | What to chart | Why it matters |
|---|---|---|
| Symptoms | Specific signs, frequency, duration, triggers | Supports diagnostic criteria |
| Impairment | Work, school, relationships, sleep, self-care | Supports medical necessity |
| Differential | Why this code fits better than alternatives | Reduces coding ambiguity |
| Plan | Interventions, goals, coordination, follow-up | Links diagnosis to treatment |
Turn Diagnosis Codes Into Cleaner Notes
MentalNote helps therapists document diagnosis, symptoms, interventions, and plan in a format that is easier to match to payer-ready F-codes. Use it to reduce copy-paste errors and keep your clinical language consistent across progress notes.
Try Free in Word →Billing edge cases, specifiers, and common mistakes
The most common coding mistake therapists make is selecting a diagnosis that sounds clinically plausible but is not yet supported by the chart. Another frequent issue is using an unspecified code when a more specific code is clearly available. Payers do not require perfection, but they do expect consistency between the assessment, treatment plan, and submitted diagnosis.
Be cautious with mixed presentations. Clients often present with anxiety and depression, sleep disturbance, trauma symptoms, and irritability at the same time. That does not mean you should automatically code everything separately. Choose the primary condition driving treatment, and add secondary diagnoses only when they are independently clinically relevant. If you need help structuring this across a note, our clinical note examples page can help with phrasing and sequencing.
Personality disorder diagnoses, eating disorders, and psychotic disorders generally require a stronger longitudinal record than a routine outpatient intake. For example, F60.3 Borderline personality disorder should be supported by patterns over time, not a single crisis session. Similarly, eating-disorder codes should reflect the behavioral pattern, medical risk, and relevant coordination of care when appropriate. When coding child and adolescent disorders such as F91.3 or F90.2, make sure the developmental context and collateral information are documented.
For clinicians working with insurance, it helps to remember that the diagnosis code and the CPT code answer different questions. The diagnosis explains why the service was medically necessary. The CPT code explains what service was delivered. If your practice regularly struggles with payer audits or chart quality, review our insurance documentation requirements guide and your state’s rules for documentation retention and scope; verify with your state licensing board.
Sample Note Example
Below are two realistic documentation snippets showing how an F-code can be tied to symptom data and treatment language. These are examples only; adapt them to your own template and payer requirements.
Dx: F43.23 Adjustment disorder with mixed anxiety and depressed mood. Client describes onset of symptoms following recent separation, including tearfulness, rumination, reduced appetite, and intermittent insomnia. Presentation is temporally linked to the stressor and does not currently meet criteria for a major depressive episode based on available assessment data. Provided supportive therapy, normalization, and problem-solving around coping resources. Plan: Monitor symptom trajectory and reassess diagnosis if severity or duration changes.
In a stronger chart, the diagnosis is not just named; it is defended. That defense appears in the assessment narrative, mental status findings, risk review, and plan. If you already use documentation guides or structured templates, align the diagnosis wording with the exact F-code selected.
Frequently Asked Questions
What is the difference between DSM and ICD codes for therapists?
DSM-5-TR names the disorder and guides diagnostic formulation, while ICD-10-CM provides the billable code used on claims. In practice, therapists often think in DSM terms and submit ICD-10 F-codes on the billing form.
Can I use an unspecified F-code for every new client?
No. Unspecified codes are appropriate only when the chart does not yet support a more specific diagnosis. If the presentation is clear, select the most specific accurate code and document why it fits.
Do all insurers cover the same F-codes?
No. Coverage varies by payer, plan, and context of care. Verify with the payer’s policy and use a diagnosis that is both clinically accurate and covered for the service being billed.
Which F-codes are most common in outpatient therapy?
Common outpatient diagnoses include F41.1 generalized anxiety disorder, F33.1 recurrent major depressive disorder, F43.23 adjustment disorder with mixed anxiety and depressed mood, F32.1 major depressive disorder single episode moderate, and F43.12 chronic PTSD.
How specific should my diagnosis documentation be?
Specific enough to support medical necessity, clinical reasoning, and continuity of care. Document symptoms, duration, severity, functional impairment, and the rationale for the selected code so the chart matches the claim.
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