Coastwise Health Blog
Updated May 23, 2026
Written by the Coastwise Clinical Team
Dual diagnosis is common among the clients Coastwise sees from Long Beach, San Pedro, Torrance, and the greater South Bay, and it's often the reason outpatient care has felt like "almost enough" to families who have already tried it. When someone is struggling with both a substance use problem and a mental health condition, treating one without the other rarely works. The anxiety that drove the drinking is still there when the drinking stops. The depression that made opioids feel like relief doesn't disappear when the opioids do. The trauma underneath a long pattern of substance use keeps pulling at someone until it gets addressed directly.
This is why dual diagnosis treatment matters. It recognizes that mental health and addiction are not separate problems to solve in sequence. They are often the same problem showing up in two dimensions, and they need to be treated together.
Dual diagnosis, also called co-occurring disorders, is the clinical term for having both a substance use disorder and a mental health condition at the same time.
This is not rare. According to national data from SAMHSA, roughly half of people with a substance use disorder also have a co-occurring mental health condition. For many clients, the conditions are intertwined: the mental health condition may be driving the substance use, and the substance use is making the mental health condition worse over time.
Any mental health condition can co-occur with any substance use disorder, but some combinations are especially common.
Anxiety and alcohol. Alcohol temporarily dampens anxiety, making it an easy form of self-medication. Over time, regular drinking to manage anxiety leads to tolerance, dependence, and often worsening baseline anxiety when not drinking, because alcohol withdrawal raises anxiety. This is one of the most common dual diagnosis patterns clinicians see.
Depression and alcohol or opioids. Alcohol and opioids can temporarily blunt depressive pain, but both are depressants and worsen depression over time. Clients often describe a cycle of using to feel less bad, feeling worse afterward, and using more.
PTSD and substance use. Trauma survivors often turn to substances to manage hyperarousal, intrusive memories, or emotional numbing. Untreated trauma is one of the most consistent predictors of substance use and relapse. Targeted trauma treatment like EMDR is often essential for lasting recovery in this combination.
Bipolar disorder and substance use. Rates of substance use are meaningfully higher in people with bipolar disorder than in the general population. Substance use can trigger mood episodes, and mood episodes, especially mania, often lead to impulsive substance use. Integrated treatment with psychiatric medication management is particularly important here.
ADHD and stimulant or cannabis use. Undiagnosed or undertreated ADHD is linked to higher rates of substance use, especially cannabis and stimulants. Proper ADHD treatment can meaningfully reduce substance use patterns that started as self-medication.
For much of the history of addiction treatment, the dominant model was sequential: first get clean, then address mental health. This approach consistently produced poor outcomes.
If someone is drinking to manage anxiety, and they get sober without treating the anxiety, the anxiety comes back full force. The tool that was managing it is gone. The pressure to return to drinking is enormous. This is not a failure of willpower. It is a predictable consequence of leaving the underlying driver untouched.
The same dynamic applies to every common dual diagnosis combination. Untreated depression drives relapse on opioids. Untreated PTSD drives relapse on alcohol. Untreated ADHD drives relapse on cannabis or stimulants. When the mental health condition is left alone, substance use tends to return as the familiar way of managing it.
The research on this is clear: integrated treatment, where both conditions are addressed at the same time by the same clinical team, produces better long-term outcomes than treating them separately or in sequence.
Coastwise's PHP and IOP programs treat co-occurring disorders within the same clinical team rather than referring them out to separate providers.
Integrated treatment at Coastwise includes:
All of this happens inside the same clinical team. The psychiatric and substance use pieces are coordinated, not siloed.
Yes, and for most people it can be treated effectively in outpatient settings. A common misconception is that dual diagnosis requires residential treatment. Most dual diagnosis can be treated in PHP or IOP, and there's often a clinical advantage to doing so: outpatient treatment integrates into the client's real life, where their mental health symptoms and substance use patterns actually play out. Skills learned in session get practiced in the environment where they're needed.
Residential may be indicated in specific situations, including acute psychiatric instability, severe withdrawal risk, or an unsafe home environment, but it is not a default requirement. See Levels of Care in Addiction Treatment for a full breakdown of when each level fits.
Yes. Dual diagnosis treatment is covered by most major insurance plans when clinical needs support it. Because mental health and substance use are both covered under behavioral health benefits, and federal parity law requires comparable coverage for both, integrated treatment is generally straightforward to authorize.
Our admissions team verifies your benefits at no cost. Call (424) 536-3002 or reach out online.
If you suspect you have a co-occurring mental health condition alongside substance use, or you know you do but haven't found a program that takes both seriously, start with a free clinical assessment. Our admissions team will evaluate both dimensions and match you to the right level of care: PHP, IOP, or standalone therapy through Coastwise Counseling Center.
Call (424) 536-3002 or request a consultation online. Monday through Saturday, 9:00 AM to 8:00 PM.
Located at 1366 W 7th Street, San Pedro, CA.
Dual diagnosis, also called co-occurring disorders, is when someone has both a substance use disorder and a mental health condition at the same time. Common combinations include anxiety and alcohol use, depression and opioid use, PTSD and substance use, and bipolar disorder and substance use. Roughly half of people with a substance use disorder also have a co-occurring mental health condition.
The most common co-occurring combinations are: anxiety disorders with alcohol use, depression with alcohol or opioid use, PTSD with substance use (especially alcohol and stimulants), bipolar disorder with substance use, and ADHD with stimulant or cannabis use. These are patterns, not rules. Any mental health condition can co-occur with any substance use disorder.
Treating one without the other usually fails. If someone is using alcohol to manage untreated anxiety, getting sober without treating the anxiety leaves them with the underlying driver of use. If someone with depression gets clean but the depression isn't addressed, relapse risk is very high. Integrated treatment addresses both at the same time, which produces better outcomes than sequential or siloed care.
Integrated treatment means one clinical team addresses both the mental health condition and the substance use at the same time. At Coastwise, this includes psychiatric evaluation and medication management, individual therapy with a clinician trained in both substance use and mental health, group therapy that integrates relapse prevention with emotional regulation skills, and specialty modalities like EMDR for trauma-driven substance use.
Yes. Dual diagnosis is routinely and effectively treated in outpatient programs (PHP and IOP). Outpatient is often preferred for dual diagnosis because it allows treatment to integrate into the client's real life, where their mental health symptoms and substance use patterns actually play out. Coastwise's PHP and IOP are both built to deliver integrated dual diagnosis care.
Yes. Dual diagnosis treatment is covered by most major insurance plans when clinical needs support it. Because mental health and substance use are both covered under behavioral health benefits, integrated treatment is generally straightforward to authorize. Our admissions team verifies your benefits at no cost.
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