Mental health is an important part of overall health, yet millions of people in the United States experience mental health conditions every year. These conditions can affect emotions, thoughts, behavior, relationships, work, education, and everyday activities.

Mental illness covers a broad range of conditions, from anxiety and depression to bipolar disorder, post-traumatic stress disorder (PTSD), schizophrenia, and other disorders. The severity can vary considerably from one person to another.

Recent national data shows how widespread the issue has become. According to the 2024 National Survey on Drug Use and Health (NSDUH), 23.4% of U.S. adults, or approximately 61.5 million people, experienced any mental illness during the past year. In the same year, 5.6%, or approximately 14.6 million adults, experienced serious mental illness.

Common mental health conditions in the US

Mental illness includes many different conditions, each with its own symptoms, causes, and treatment approaches.

Depression

Depression is more than occasional sadness. Major depressive disorder can affect mood, interest in activities, sleep, concentration, energy, and daily functioning.

In 2024, approximately 8.2% of US adults, or 21.4 million people, experienced a major depressive episode during the previous year.

Depression also affects younger populations. Among adolescents aged 12–17, 15.4% experienced a major depressive episode in 2024.

Anxiety disorders

Anxiety disorders are another major category of mental health conditions. They can involve persistent fear, worry, nervousness, or physical symptoms that interfere with daily life.

The 2024 NSDUH found that 7.4% of adults had moderate or severe symptoms of generalized anxiety disorder (GAD). Among adolescents aged 12 to 17, 18.8% had moderate or severe GAD symptoms.

Bipolar disorder

Bipolar disorder involves significant changes in mood, energy, activity levels, and the ability to perform daily tasks. Episodes can include periods of depression and periods of mania or hypomania.

Because symptoms can vary substantially, diagnosis and treatment generally require professional assessment.

PTSD

Posttraumatic stress disorder can develop after exposure to a traumatic event. Symptoms may include intrusive memories, avoidance, changes in mood and thinking, and increased alertness or reactivity.

PTSD can affect a person’s relationships, employment, sleep, and overall quality of life.

Schizophrenia

Schizophrenia is a serious mental illness that can affect perception, thinking, emotions, and behavior. Symptoms may include hallucinations, delusions, disorganized thinking, and difficulties with motivation or functioning.

Early identification and appropriate treatment can play an important role in managing symptoms and supporting long-term functioning.

Mental health among adolescents

Mental health concerns are also significant among children and teenagers.

In 2024, 18.8% of adolescents aged 12–17 experienced moderate or severe symptoms of generalized anxiety disorder. In addition, 15.4% experienced a major depressive episode during the previous year.

Treatment access remains an important issue for this age group. Among the estimated 3.8 million adolescents who experienced a major depressive episode in 2024, approximately 60.6% received mental health treatment during the year.

This means a substantial number of adolescents experiencing depression did not receive reported mental health treatment during that period.

The mental health treatment gap

The prevalence of mental illness does not automatically mean that everyone receives professional care.

According to SAMHSA’s 2024 data, 52.1% of adults who experienced any mental illness received mental health treatment during the past year.

This leaves a significant portion of adults without reported treatment.

The reasons for this gap can vary. Cost, insurance coverage, availability of providers, transportation, stigma, difficulty finding appropriate care, and personal circumstances can all influence whether someone seeks or receives treatment.

Access can also differ between communities and demographic groups. SAMHSA’s 2024 data found differences in treatment receipt by sex and race or ethnicity among adults with mental illness.

Why access to mental health care matters

Mental health conditions can affect much more than emotional well-being. They may influence employment, education, relationships, physical health, financial stability, and quality of life.

For people experiencing severe symptoms, timely access to appropriate treatment can be particularly important.

Mental healthcare can include psychotherapy, counselling, psychiatric services, prescription medication, telehealth, inpatient treatment, outpatient care, or a combination of approaches depending on the individual’s condition and clinical needs.

Telehealth has also become an important part of mental healthcare. In 2024, 13.1% of adolescents aged 12 to 17 received mental health treatment through telehealth.

The role of mental health practices

As demand for mental healthcare grows, behavioural health and mental health practices must manage both clinical and administrative responsibilities.

Providers need to focus on patient care while also dealing with insurance verification, documentation, coding, claims, payment posting, denials, and accounts receivable.

This is where specialized revenue cycle support can become relevant.

Practices researching the best mental health billing company should consider whether a billing provider understands behavioral health services, payer requirements, documentation standards, coding, claim submission, and denial management.

Medical Billing for Small Mental Health Practices

Smaller mental health practices can face different administrative challenges from large healthcare organizations. A practice with only a few therapists or providers may not have enough staff to maintain a dedicated billing department.

This has increased interest in medical billing services for small practices, where billing and revenue cycle functions can be handled externally.

Depending on the arrangement, these services may include eligibility verification, medical coding, claim submission, payment posting, denial management, accounts receivable follow-up, and reporting.

The objective is not simply to submit claims but to maintain an organised revenue cycle that supports the practice’s financial operations.

The growing need for mental health care

The latest US statistics demonstrate the scale of mental health needs across adults and adolescents.

With 61.5 million US adults experiencing any mental illness in 2024, mental health services remain an important component of the healthcare system.

At the same time, treatment data shows that access remains incomplete. About half of adults with any mental illness received treatment in 2024, while adolescents with major depressive episodes also experienced a treatment gap.

Takeaway

Mental illness affects millions of people across the United States, making mental healthcare an important part of the country’s broader healthcare system.

Depression, anxiety disorders, bipolar disorder, PTSD, schizophrenia, and other conditions can affect people at different stages of life and with varying levels of severity. Current data also shows that many people experiencing mental health conditions do not receive treatment..

Improving mental health outcomes requires attention not only to treatment but also to the accessibility and infrastructure needed to connect people with appropriate care.

Robert Haynes, a psychology graduate from the University of Hertfordshire, has a keen interest in the fields of mental health, wellness, and lifestyle.