Home > Blog > Most Frequently Used Mental Health ICD-10 Codes Used By Therapists 2024

Most Frequently Used Mental Health ICD-10 Codes Used By Therapists 2024

Courtney Gardner, MSW

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As mental health professionals, we understand that accurate diagnosis coding is crucial for your practice. With 2024 fast approaching, we know that keeping up with the latest updates to the International Classification of Diseases-10 (ICD-10) codes while managing your cases can be overwhelming and stressful. We're here to support you in providing the best care for your clients while ensuring your practice's financial stability. The World Health Organization (WHO) updates the ICD-10 codes annually to reflect medical knowledge and terminology changes. These changes may be minor in some years but require more significant adjustments in others. We recognize that this year's updates will affect several codes commonly used in behavioral health settings. To ensure ethical and compliant care for your clients, we are providing an overview of the top billed ICD-10 codes and advice on expanding your coding knowledge.

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What Are ICD-10 Codes and Why Are They Important for Mental Health Practitioners?

The mental health field is complex and extensive, encompassing various categories and codes that help identify and address many mental health conditions. In the United States and around the world, mental health professionals follow the standardized system of ICD-10 codes to diagnose and bill for mental health issues and illnesses. It is crucial to use these codes accurately to provide quality care to clients. ICD-10 codes provide a reliable and consistent way to report diagnoses and procedures performed in your practice to other medical professionals, ensuring accurate communication between healthcare providers.

The ICD-10 codes are divided into chapters based on the disease or body system for quick identification and treatment of mental health diagnoses. Mental health conditions are broadly classified into three categories: F, G, and Z. ICD-10 codes for mental health are mainly classified under the F codes category. However, G codes significantly classify various factors influencing health status and healthcare delivery. They offer valuable additional information that could prove helpful in client care, research, or reimbursement purposes. Z codes, on the other hand, are used to identify situations where the client requires services. Still, no specific disorder has been identified, such as a personal history of psychological trauma or a general psychiatric examination requested by an authority body.

ICD-10 Codes are also essential for:

  • Including ICD-10 codes when submitting claims to insurance companies and Medicare for reimbursement is crucial. These codes help determine medical necessity, leading to authorized payment. Failure to include the correct codes can result in denied or delayed claims.

  • Meeting compliance and reporting requirements is crucial, as government agencies and accrediting bodies often demand ICD-10 codes for reporting purposes.

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  • Using ICD-10 codes is a reliable way to track client caseloads and conditions and monitor the incidence, prevalence, and treatment outcomes of specific diagnoses over time.

  • Aggregated ICD-10 data is valuable for medical research since it provides information on the prevalence and outcomes of mental health conditions. Additionally, it assists public health officials in cost analysis and resource allocation.

  • ICD-10 codes help medical professionals to authorize and refer clients for required treatments and procedures.

Without utilizing ICD-10 codes correctly, you risk:

  • Claim denials from insurance companies

  • Loss of revenue due to incorrect or absent diagnosis codes

  • Inability to demonstrate the need for specific treatments or services for your clients.

Overview of Key Updates to ICD-10-CM Diagnosis Codes for 2023

The ICD-10 has been significantly updated to reflect current clinical practices and medical research. These updates are effective from October 1, 2022, to September 30, 2023. The latest changes offer a more comprehensive approach with detailed information on the severity of disorders, diagnostic specificity, and emerging conditions. The recent updates in mental health diagnosis codes provide greater accuracy in identifying various mental health conditions.

Substance use disorder codes now offer separate codes for moderate, severe, and remission, which provides a more precise diagnosis. Eating disorder codes have been revised to differentiate between anorexia nervosa and other feeding or eating disorders, with new specifiers for bulimia nervosa indicating whether it is in partial or total remission. Codes for anxiety disorders are now more specific, with unique codes for Generalized Anxiety Disorder, Other Specified Anxiety Disorders, and Social Anxiety Disorder. Additionally, there are new codes for neurocognitive disorders, obsessive-compulsive and related disorders, and prolonged grief disorder or complicated grief, which can help identify individuals who may require targeted treatment and support for persistent and intense grief.

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A Comprehensive Guide of the Top 20 Billed ICD-10 Codes of 2023

As a seasoned professional in behavioral health, it is essential to keep abreast of the latest ICD-10-CM codes, particularly the 20 billed codes of 2023. These codes provide valuable insights into the most prevalent diagnoses, equipping you with the necessary knowledge to deliver optimal client care. Mastering the commonly used diagnostic codes and staying up-to-date with changes in diagnostic codes and effective treatments will enable you to provide compassionate care for your clients. Remember that the work may be challenging, but the reward of helping others overcome mental health issues and live happier, healthier lives is immeasurable.

Disorders of the Adult Behavior & Personality

This category includes conditions like Antisocial Personality Disorder (F60.2), Borderline Personality Disorder (F60.3), and Narcissistic Personality Disorder (F60.81). These codes cover a range of maladaptive personality traits and behaviors that cause significant problems with relationships and day-to-day functioning.

Mood (Affective) Disorders

Some commonly used codes in mental health refer to disorders that affect mood and overall well-being. These codes include Major Depressive Disorder (F33.9), dysthymia (F34.1), and Bipolar Disorder (F31.9). The two most commonly used codes for Major Depressive Disorder are F32.9 for single episodes and F33.9 for recurrent episodes.

Anxiety, Neurotic, Stress-Related, and Somatoform Disorders

This category contains various medical conditions related to anxiety and stress. Generalized Anxiety Disorder (Code F41.1) is one of the most common conditions due to the high prevalence of chronic anxiety and worry among people. Panic Disorder (F41.0) and Adjustment Disorder (F43.2) are other codes used for anxiety, fear, and maladaptive reactions to stressful life events that can cause emotional or behavioral symptoms. Post-Traumatic Stress Disorder (PTSD), including F43.1 (acute) and F43.10 (unspecified), is also included in this category.

Psychological Development Disorders

This diagnostic category includes conditions such as Autism Spectrum Disorder (F84.0), Attention-Deficit Hyperactivity Disorder (F90.9), and intellectual disabilities (F70-F79). These codes are used for disorders that begin in childhood and involve impaired or delayed development of specific mental abilities, learning, self-control, and adaptive functioning.

Substance Use Disorders

This category includes codes F10.20 (Alcohol dependence, uncomplicated) and F11.20 (Opioid dependence, uncomplicated), which indicate the ongoing need to address addiction and its consequences.

Neurocognitive Disorders

Dementia codes F01.51 (Vascular dementia without behavioral disturbance), F03.90 (Unspecified dementia without behavioral disturbance), and F02.80 (Dementia in other diseases classified elsewhere without behavioral disturbance) point to the importance of proper diagnosis and management of cognitive decline.

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Improving Your ICD-10 Coding Skills

It's essential to prioritize accurate coding for your clients. It showcases your dedication to delivering top-notch care and your recognition of the value of correct documentation and billing procedures. You can always seek educational resources to enhance your expertise and boost confidence in utilizing these vital classification tools. Take advantage of the ICD-10-CM code book's valuable insights and advice whenever you encounter uncertainties about a particular code.

If you need help to improve your coding skills, consider the following resources:

  • Consider more education. Take a coding course or work with a certified professional coder. Continuous learning will boost your confidence and competence.

  • Reference the ICD-10-CM official guidelines for coding and reporting.

  • Stay up-to-date with resources from the American Psychological Association and American Psychiatric Association.

  • Review the complete ICD-10 mental health code list. Familiarize yourself with categories like mood disorders (F30-F39), anxiety disorders (F40-F48), and schizophrenia (F20).

  • Note changes in the new edition. Read summaries of updates impacting mental health coding.

  • When in doubt, contact insurance companies or coding experts for clarification. Seek guidance from your practice's billing or coding specialist. Proper coding and documentation are essential and worth the effort.

FAQ: ICD-10 Codes for Common Mental Health Conditions

The new 2023 codes have come into effect, and it's necessary to understand them for precise reporting. We should take responsibility for our knowledge and have confidence in our ability to provide optimal client care. It's time to step up and embrace these changes to improve mental health care. You may have questions about adapting to changes. Here are answers to the most common questions regarding the top ICD-10 codes for mental health conditions.

What are the most common ICD-10 codes used in mental health?

  • F41.9 Anxiety disorder, unspecified
  • F32.9 Major depressive disorder (MDD), single episode, unspecified
  • F43.10 Post-traumatic stress disorder, unspecified

What are the most frequently used ICD-10 codes for anxiety disorders?

  • F41.1 (Generalized anxiety disorder): This code is frequently used due to the high prevalence of GAD. Generalized anxiety disorder involves excessive worry and anxiety about multiple events or activities.
  • F41.9 (Anxiety disorder, unspecified): This catch-all code is used when the specific type of anxiety disorder is not known or specified. It includes disorders like panic disorder, social anxiety disorder, and separation anxiety disorder.

What ICD-10 codes are most commonly used for depression?

  • F32.9 (Major depressive disorder, single episode, unspecified): This code is commonly used for a single episode of major depression that is not otherwise specified. It includes symptoms like depressed mood, loss of interest, changes in appetite, and sleep disturbances.
  • F33.9 (Major depressive disorder, recurrent, unspecified): This code applies to recurrent major depressive disorder where two or more episodes have occurred but are not otherwise specified. It indicates a chronic and relapsing form of depression.

How do I code for depression?

There are several ICD-10 codes for depression depending on the severity and specifics of the diagnosis:

  • F32.0 Major depressive disorder (MDD), single episode, mild.
  • F32.1 Major depressive disorder (MDD), single episode, moderate.
  • F32.2 Major depressive disorder (MDD), single episode, severe without psychotic features.
  • F32.3 Major depressive disorder (MDD), single episode, severe with psychotic features.

What are the most common diagnostic categories?

The top categories include:

  • Mood (affective) disorders (F30-F39): Depression, bipolar disorder
  • Anxiety, dissociative, stress-related, somatoform, and other nonpsychotic mental disorders (F40-F48): Anxiety, PTSD, OCD
  • Schizophrenia, schizotypal and delusional disorders (F20-F29)

How often do ICD-10 codes change?

ICD-10 codes are updated annually on October 1. Mental health practitioners should stay up-to-date with changes to ensure accurate diagnosis coding and billing. Monitoring updates to the ICD-10-CM diagnosis codes helps avoid claim denials and provides you with the most current terminology.


Mastering diagnosis coding may be a challenging part of your job, but it is essential to providing quality care and ensuring proper reimbursement. By staying up-to-date with the latest ICD-10 codes and understanding their impact on your clients' care plans, you can become more efficient and effective in your practice. With the right resources, such as training courses, coding manuals, and professional consultants, you can improve your coding skills and confidence and achieve tremendous success in your business. Accurate coding is an investment in your practice and a service to your clients. So, code confidently and continue helping your clients achieve better mental health and well-being. With dedication and perseverance, you can master the art of coding and become a true expert in your field. Remember, your hard work and commitment to accuracy will pay off in the long run, enabling you to provide the best care to those in need.

If you're a mental health professional looking to stay up-to-date with the latest codes and increase productivity, consider subscribing to Mentalyc. Our platform offers a range of AI-powered tools to help you save time and deliver better client care. For example, you can use the platform's template progress notes to streamline your workflow and ensure the quality of care you provide to your clients is top-notch. Additionally, Mentalyc allows you to write progress notes for your clients from audio recordings of your sessions, taking the hassle out of manual note-taking. Join the Mentalyc community today and take your practice to the next level!

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All examples of mental health documentation are fictional and for informational purposes only.

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