The most common ICD-10 codes for mental health billing are F41.1 (generalized anxiety disorder), F43.23 (adjustment disorder with mixed anxiety and depressed mood), F33.1 (major depressive disorder, recurrent, moderate), F32.9 (MDD, single episode, unspecified), F43.10 (PTSD, unspecified), and the ADHD codes F90.0 and F90.2. All codes in this guide are valid for the FY2026 ICD-10 mental health code set, effective October 1, 2025.
Getting these codes right matters more in behavioral health than almost anywhere else. Mainly because mental health claims are denied at 15 to 20 percent. These stats are nearly double the rate for medical and surgical claims, according to the AMA 2025 Prior Authorization Physician Survey. These denials cost providers millions in delayed and lost reimbursement every year.
This guide lists the ICD-10 codes mental health providers actually bill, along with the psychiatric diagnosis codes that support them, so you can match the right ICD 10 code for mental health problems ranging from anxiety to psychosis, avoid the common mistakes, strengthen your mental health ICD 10 coding, and collect what you have earned.
Top ICD 10 Codes for Mental Health and What They Mean
Below is a structured breakdown of high-frequency mental health ICD 10 codes for billing. We’ve grouped each ICD 10 code for mental health conditions into major diagnostic categories for clarity. Each code is accompanied by a brief description of the condition it represents:
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Anxiety and Stress-Related Disorders
Anxiety and adjustment disorders are two mental health complications mainly caused by chronic worry or recognizable life stressors, and are in most cases billed highly in the United States. Such diagnoses involve recording details of the symptoms, duration, and context, usually established during an initial psychiatric evaluation, billed under CPT 90791. See the FAQ below on how evaluations are coded.
The table given below summarizes the most prominent mental health diagnosis codes normally used in this category and tips to verify correct billing.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F41.1 | Generalized Anxiety Disorder (GAD) | Persistent anxiety lasting 6+ months. Use the ICD-10 code for anxiety with depression only when both are present. |
| F43.23 | Adjustment Disorder with Mixed Anxiety and Depressed Mood | For clients facing stressors with both anxiety and depression. This is an ICD 10 code for anxiety with depression when mixed. |
| F43.22 | Adjustment Disorder with Anxiety | Stress-induced anxiety without depressive features. Note onset within 3 months of stressor. |
| F41.9 | Anxiety Disorder, Unspecified | Used during the initial assessment phase. Update to a specific code once the diagnosis is clear. |
| F43.10 | PTSD, Unspecified | PTSD without identifying the chronic or acute stage. Document trauma exposure, flashbacks, and hypervigilance. |
| F43.12 | PTSD, Chronic | PTSD symptoms persisting longer than 3 months. Confirm ongoing impairment. |
Depressive Disorders
Millions of people suffer from depression every year, which can manifest as one or several bouts of varied severity. Choosing the right ICD 10 code for depression starts with clear identification of the episode history, symptom severity, and psychotic symptoms, if present. In mental health billing services, these codes ensure reimbursement accuracy and compliance.
Refer to the table below for important ICD-10 codes and documentation needs linked to depression.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F33.1 | MDD, Recurrent, Moderate | Document at least two episodes and moderate symptom severity. |
| F33.0 | MDD, Recurrent, Mild | Note the history of recurrence and mild functional impairment. |
| F33.2 | MDD, Recurrent, Severe | Describe intensity and daily impact; avoid using ICD 10 codes for mental health disorder unspecified. |
| F33.3 | MDD, Recurrent, Severe with Psychotic Features | Document delusions or hallucinations along with depressive symptoms. |
| F32.1 | MDD, Single Episode, Moderate | Indicate the first occurrence and functional impact. |
| F32.0 | MDD, Single Episode, Mild | Confirm lack of prior depressive episodes. |
| F32.2 | MDD, Single Episode, Severe | Outline symptom intensity and effect on functioning. |
| F32.3 | MDD, Single Episode, Severe with Psychosis | Describe psychotic symptoms clearly and relate them to mood. |
| F32.9 | MDD, Single Episode, Unspecified | A temporary placeholder when severity is not yet documented. Replace it with a specific code once assessment is complete. |
| F32.A | Depression, Unspecified | Use when depression is documented without confirmed MDD, severity, or episode pattern. Added FY2022 to reduce overuse of F32.9. Not an anxious-distress specifier. |
| F34.1 | Dysthymic Disorder (Persistent Depressive Disorder) | Chronic, low-level depression lasting 2+ years — a frequent chronic mental illness ICD 10 pick. Confirm duration without major gaps. |
ADHD and Neurodevelopmental Disorders
Common in both children and adults, ADHD and autism spectrum diagnoses require precise identification of symptom type and behavioral patterns. Coding accuracy supports better treatment planning and payer approval.
The following table highlights essential codes for neurodevelopmental conditions and how to support them in documentation.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F90.2 | ADHD, Combined Type | Document both inattentive and hyperactive symptoms with functional impact. |
| F90.0 | ADHD, Predominantly Inattentive Type | Focus on distractibility, forgetfulness, and poor concentration. This is one of the most-billed codes for behavioral issues in both children and adults. |
| F90.9 | ADHD, Unspecified Type | When ADHD is confirmed, but the type is not yet determined, explain further assessment planned. |
| F84.0 | Autism Spectrum Disorder | Describe social, communication, and behavioral deficits with developmental history. |
Other Mental Health & Z-Codes
Z-codes and lesser-used psychiatric diagnoses offer context or capture conditions like OCD or life stressors. These diagnosis codes for mental health context are not always reimbursable as primary diagnoses, but they provide valuable insight into the full clinical picture.
See the table below for high-utility ICD codes for mental health context outside the core mood and anxiety categories.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F43.20 | Adjustment Disorder, Unspecified | When the symptom type isn’t clear, note the stressor and reason for not specifying the subtype. |
| F42.9 | Obsessive-Compulsive Disorder (OCD) Unspecified | Describe intrusive thoughts or repetitive behaviors and their impact. |
| Z63.0 | Relationship Problem with Spouse or Partner | Used for couples therapy or relationship distress. This is a context Z-code, typically billed secondary to a clinical diagnosis. |
| Z71.3 | Dietary Counseling and Surveillance | When therapy includes guidance on eating behaviors, it supports eating disorders. |
Schizophrenia and Related Psychotic Disorders
Schizophrenia and similar psychotic disorders all use codes in the F20–F29 range, including the ICD 10 code for psychosis when no schizophrenia-spectrum diagnosis is established yet (F29 — see the FAQ below). These mental health diagnosis codes describe how patients think, feel, and see reality. Accurate use of each ICD 10 code for psychiatric disorder is key to correct billing and documentation, which is where dedicated psychiatry billing services prove their value.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F20.0 | Paranoid Schizophrenia | Persistent delusions or hallucinations about harm or persecution. Use the ICD-10 code for paranoid schizophrenia; here, document specific paranoid themes. |
| F20.9 | Schizophrenia, Unspecified | Use when you’re sure it’s schizophrenia, but the subtype is unclear. This is the ICD 10 code for schizophrenia, unspecified. Update if more detail emerges. |
| F25.9 | Schizoaffective Disorder, Unspecified | Mixed mood and psychotic symptoms. This is the schizoaffective disorder ICD 10 code. Note both mood swings and psychotic features. |
| F21 | Schizotypal Disorder | Odd beliefs or strange behavior without apparent psychosis. Document unusual thoughts and the level of social impairment. |
| F22 | Delusional Disorder | Steady, non-bizarre delusions without other psychosis. Describe the fixed false beliefs and duration. |
Behavioral and Other Disorders
These codes (F90–F98) cover ADHD, ODD, and other behavioral problems. Using the correct mental health ICD 10 codes and aligning them with CPT codes for mental health prevents denials and keeps patient charts clear.
| Code | Diagnosis | Typical Usage & Tips |
|---|---|---|
| F90.0 | ADHD, Predominantly Inattentive Type | Inattention without hyperactivity. A staple ICD 10 code for behavioral problems. Document focus issues and distractibility. |
| F91.3 | Oppositional Defiant Disorder | Repeated arguing, defiance, or anger toward authority—this is the ICD 10 oppositional defiant disorder code. Note frequency and settings. |
| F91.8 | Other Conduct Disorders | Aggressive or rule-breaking behaviors that do not fit conduct disorder. Explain the types of misconduct. |
| F93.0 | Separation Anxiety Disorder | Excessive fear of separation in children. Document age, triggers, and duration of anxiety. |
| F99 | Mental Disorder, Not Otherwise Specified (NOS) | The ICD 10 code for mental health disorder unspecified, used when no specific diagnosis fits. Update to a precise code once assessment is complete. |
Pairing ICD-10 Mental Health Codes with CPT Codes on the Claim
Every clean claim pairs one of the ICD-10 codes mental health clinicians use daily with a CPT service code. Mismatched pairs are a top preventable denial.
| Service | CPT | Example Diagnosis | ICD-10 |
|---|---|---|---|
| Initial psychiatric evaluation | 90791 | MDD, recurrent, moderate | F33.1 |
| 45-minute psychotherapy | 90834 | Generalized anxiety disorder | F41.1 |
| 60-minute psychotherapy | 90837 | PTSD, chronic | F43.12 |
| Family therapy with patient | 90847 | Adjustment disorder, mixed | F43.23 |
| Crisis psychotherapy | 90839 (+90840) | PTSD, acute | F43.11 |
Telehealth: append modifier 95 (audio-video) or 93 (audio-only) and the right POS code, 10 for patient at home, 02 for elsewhere. For practices running behavioral health integration or Collaborative Care programs, the CoCM codes 99492–99494 pair with these same diagnosis codes. For the full service-side list, see our CPT codes for mental health guide.
What Changed in the FY2026 ICD-10-CM Update
The FY2026 ICD-10 mental health code set took effect October 1, 2025 and applies to all claims through September 30, 2026. On the side of behavioral health, the main change is within the financial insecurity. The single code Z59.86 was retired as a billable code and replaced by three specific codes, Z59.861 (difficulty paying for basic needs), Z59.868 (other specified financial insecurity), and Z59.869 (financial insecurity, unspecified). If your EHR templates still carry Z59.86 as a billable code, claims will be rejected.
Recent cycles also added codes worth having in your templates: F43.81 (prolonged grief disorder, FY2023), F32.A (depression, unspecified, FY2022, for documented depression without confirmed MDD), severity-specific eating-disorder codes (F50.x expansions), and F68.A (factitious disorder imposed on another, coded to the perpetrator, not the victim).
CMS publishes the addenda each summer, so review it before the effective date, check each psychiatric disorder ICD 10 entry against the current fiscal year set, and update your EHR favorites list.
Consequences of improper ICD 10 codes for mental health coding
In mental health care, every diagnosis (such as anxiety, depression, or ADHD) has its own ICD 10 code for mental health billing purposes. Entering inappropriate ICD 10 codes for mental health may lead to numerous issues on the part of the clinic and the patient. Insurers employ these codes in determining whether a claim is to be validated. If the code is vague or does not match the documented diagnosis, the insurer can deny the claim outright or hold it for additional records, and every denial delays payment while your staff corrects and resubmits. Documentation gaps, incorrect diagnosis selection, and coding mismatches are among the common reasons behavioral health claims are denied.
Rejection of insurance claims or delays:
Vague or overly general codes are among the top ICD-10 codes mental health payers flag. Some errors bounce back as a clearinghouse rejection before the payer ever sees the claim; others come back as formal denials on the ERA/EOB. Either way, every refusal delays payment until staff correct the code and resubmit.
Payment issues:
Wrong codes cut both ways. Undercoding, choosing a code milder than the documented condition, means the payer reimburses you less than you earned. Overcoding, billing a more severe or complex code than the documentation supports, can trigger payer fraud reviews. Either way, the practice loses money in the long run. Incremental errors amount to major losses of revenue. Providers can even be forced to repay the money if an audit detects overbilling, which is why structured denial management is a core part of any behavioral health revenue cycle.
Compliance or audit risks:
Often, coding errors sound alarm signals to auditors. Insurers and governments refer to charts to ensure codes are correct. In case they identify errors, including the intentional ones such as upcoding, the practice may be audited, fined, or penalized. As an example, using a code more complex than necessary may lead to a fraud investigation and demands for repayment. One way of avoiding these legal risks is to maintain precise codes.
Incomplete and unclear patient records:
ICD-10 codes are written in the medical record. Inaccurate codes leave the chart confusing or incomplete, and future providers reading the record cannot tell what was actually diagnosed. The errors accumulate over time to an extent that what the patient actually has is not reflected clearly in the record. This is the cause of confusion and errors in subsequent care.
Influence on treatment planning
An appropriate code favors the appropriate treatment plan. The miscoding of a mental health condition is likely to guide therapists to miss out on critical matters.
To illustrate, when a patient has bipolar disorder that is coded as a general depression code, it may leave out necessary mood stabilizers in the treatment plan. Inaccurate coding may deny the patient the required therapies or follow-up. Specific, clear codes assist in making the care plan actually suit the condition of the patient he or she is in.
It is important that ICD-10 codes do not contain errors. Inaccuracies in the mental health billing, where codes are incorrect, may interfere with or halt payment, result in an audit, make patient charts difficult to read, and even result in an incorrect treatment plan. Precise coding and documentation prevent such issues.
Real World Tips on How to Use ICD-10 Codes for Mental Health Billing
Learning each ICD 10 code for mental health billing is one thing; applying it in day-to-day practice is another. The following are some best practices that providers and their billing specialists can utilize to utilize ICD-10 codes correctly and avoid common traps:
- Highest Specificity To Code: Make an effort to use the most specific diagnosis code possible at all times that acts precisely in accordance with the patient’s condition. The use of specific codes enhances the precision of treatment records and also indicates to the insurers that it has had a proper evaluation. As an example, a patient with moderate recurrent depression should be coded with F33.1 (recurrent, moderate), and not with one of the non-specific depression codes. It should not use the “unspecified” codes (the codes ending in .9) in the long term: those should be temporary placeholders when information remains incomplete. Claims can be rejected or additional information can be asked for when a code is too broad.
- Putting the Primary Diagnosis First: The first ICD-10 code on the claims should be the top-ranked cause of the visit, or treatment of the condition that matters most about the services offered. So, as an example, suppose that you are treating an individual who has primarily shown symptoms of PTSD; list PTSD as the primary diagnosis, even though the individual may also be having, say, insomnia as well. Secondary codes can (and should) be entered in case of comorbid conditions, but ensure the primary one reflects the focus of treatment or medication management for that visit. This establishes medical necessity for the billed services.
- Align ICD-10 Codes with DSM-5 Diagnoses: Mental health providers normally diagnose using DSM-5 (or DSM-5-TR) criteria, then they seek the equivalent ICD-10 code to be used to bill. Most of the time, DSM diagnoses are directly correlated with an ICD-10 code. Keep your DSM-5-TR handy — it lists the ICD-10-CM code beside each disorder along with its criteria. This is to lend confidence that you have chosen a code with substantially covered diagnostic details recorded in your notes. Typically, the choice of a DSM diagnosis will transfer automatically into the correct ICD-10 code when choosing a DSM diagnosis using a built-in crosswalk on many EHRs.
- Don’t Forget Relevant Z-Codes: Although a Z-code in isolation may not necessarily make up a billable primary, additional Z-codes can be highly valuable context clues. When mental health or treatment of your patient is being influenced by a psychosocial factor (homelessness, job loss, domestic violence), make sure to enter that factor as a secondary diagnosis via the Z-code on the claim. The codes (such as Z63.0 family or partner problems) do not add an extra payment, but they add more detail to the portrait of a patient, causing the complexity of the given care. It is only necessary that a clinical diagnosis be the first one billed to insurance.
- Use “Rule-Out” Diagnoses Carefully: Sometimes you suspect a diagnosis but aren’t sure yet (e.g., rule out bipolar disorder). ICD-10 doesn’t have a special code for “rule-out”; you either code the symptoms or an “other specified” condition. It’s often better to code what you do know (like “Other specified depressive disorder” F32.89) rather than coding an illness the patient might have. Never code a condition that hasn’t been diagnosed just to get paid; that’s both unethical and a red flag in audits. Instead, use interim codes (like adjustment disorder or unspecified) and update later when a definitive diagnosis is confirmed.
- Keep Up with Annual Code Changes: Set a reminder each year to review the updates to ICD-10-CM (which take effect October 1). New mental health diagnoses or specifiers might be added, and sometimes codes are revised or retired. For example, the FY2023 update introduced F43.81 (prolonged grief disorder), used instead of adjustment-disorder or generic stress codes when DSM-5-TR criteria are met, and the FY2026 update effective October 1, 2025 split financial insecurity into three billable Z-codes, Z59.861, Z59.868, and Z59.869, retiring the old single Z59.86. By staying current, you ensure the ICD codes for mental health in your templates remain valid and capture the most accurate descriptions of your patients’ conditions. CMS and the American Psychiatric Association (APA) release user-friendly summaries of changes, and the ICD-10-CM Official Guidelines for Coding and Reporting are updated alongside each fiscal-year code set, so you don’t have to read the entire code manual each year.
By applying these tips, providers can improve claim acceptance rates and reduce back-and-forth with insurance companies. In short, the goal is to accurately reflect the patient’s reality in the code: no more, no less. This not only helps get you paid but also aligns with ethical coding practices.
Get the Codes Right, Get Paid Right
Accurate ICD codes for mental health are the difference between a claim that pays in 14 days and one that sits in denial queues for months. Whether you call them psychology diagnosis codes, psychiatric diagnosis codes, or F-codes, they all serve one purpose: proving medical necessity for the care you delivered. Keep this FY2026 ICD-10 mental health guide bookmarked, audit your EHR favorites each October, and when coding volume outgrows your front office, MedCare MSO’s mental health billing specialists can take the entire revenue cycle off your plate.
Frequently Asked Questions
What is the ICD-10 code for a psychiatric evaluation?
A psychiatric evaluation is not reported with an ICD-10 code; it is a service billed with CPT 90791, or 90792 when medical services such as medication management are included. Standard evaluations rarely need prior authorization, but higher-intensity services often do, so verify payer policy first.
The ICD-10 code on that claim is the diagnosis established or suspected. For screening encounters before any diagnosis, Z13.30 (screening for mental health and behavioral disorders, unspecified) or Z13.220 (screening for depression) may apply, subject to payer policy.
What is the ICD-10 code for anxiety and depression together?
There is no single combined code. When both are independently diagnosed, bill both, for example, F41.1 (GAD) and F33.1 (MDD, recurrent, moderate), sequencing the primary reason for the visit first. When mixed symptoms follow an identifiable stressor without meeting full criteria for either disorder, F43.23 (adjustment disorder with mixed anxiety and depressed mood) is the correct single code.
What is the ICD-10 code for psychosis?
F29 (unspecified psychosis not due to a substance or known physiological condition) covers psychotic symptoms without an established schizophrenia-spectrum diagnosis. Established conditions use their specific codes: F20.9 (schizophrenia), F23 (brief psychotic disorder), F22 (delusional disorder), or F32.3 and F33.3 for depression with psychotic features.
What is the ICD-10 code for mood swings?
R45.4 covers irritability and anger as a symptom code, and F39 (unspecified mood disorder) applies when a mood disorder is evident but not yet classified. If evaluation supports bipolar disorder, use the F31.x series with the current episode and severity documented.
What is the ICD-10 code for chronic mental illness?
There is no standalone chronic mental illness code. Chronicity is captured in the specific code, F33.x for recurrent depression, F34.1 for persistent depressive disorder lasting two years or more, F43.12 for chronic PTSD, and the F20 and F25 series for schizophrenia-spectrum conditions.
What are psychology diagnosis codes?
Psychology diagnosis codes, psychiatric ICD 10 codes, and psychiatric diagnosis codes all refer to Chapter 5 of ICD-10-CM, home to the ICD codes for mental health: F01 through F99, supplemented by Z-codes for psychosocial context. Psychologists, psychiatrists, and therapists all bill from the same code set, only the CPT service codes differ.
What is the ICD-10 code for behavioral issues?
In children and adolescents, F91.3 (oppositional defiant disorder), F91.8 and F91.9 (conduct disorders), and the ADHD codes F90.0, F90.2, and F90.9. For adults, code the underlying condition driving the behavior. R46.x symptom codes exist but rarely support medical necessity alone.
What is the ICD 10 code for a mental health problem, unspecified?
F99 represents unspecified mental disorder but is rarely preferred when a more specific diagnosis can be documented. Use it as a temporary placeholder for a mental health problem ICD 10 claim when no specific diagnosis is yet established, then update to a precise code once assessment is complete, since unspecified codes draw more payer scrutiny.
