- The 2026 CAS Exam Outline at a Glance
- Domain 1: Counseling
- Domain 2: Treatment Planning
- Domain 3: Professional and Ethical Responsibilities
- Domain 4: Foundations (Transdisciplinary)
- Domain 5: Client, Family, and Community Education
- Why All Five Addictive Disorders Appear on Every Exam
- Exam Format, Fees, and Scoring Mechanics
- Mapping a Study Schedule to the Five Domains
- Who Hires CAS-Credentialed Specialists
- Frequently Asked Questions
- The CAS exam is 150 multiple-choice questions in 3 hours, split across five performance domains.
- You need 100 correct answers out of 150 to pass, regardless of your specialization track.
- All candidates are tested on alcoholism, drug addiction, eating disorders, disordered gambling, and sex addiction.
- Domains span Counseling, Treatment Planning, Ethics, Foundations, and Client/Family/Community Education.
The 2026 CAS Exam Outline at a Glance
The Certified Addiction Specialist (CAS) credential is issued by the American Academy of Health Care Providers in the Addictive Disorders (AAHCPAD). It is not tied to a state licensing board, and it is a distinct credential from other certifications that happen to share the "CAS" abbreviation. Every question on the exam is written against the Academy's 2026 application and official examination outline, which organizes all content into five performance domains.
Understanding these five domains isn't optional test-prep trivia - it's the actual skeleton of the 150-question exam you'll sit for. If you haven't yet mapped your eligibility path, it's worth reviewing CAS Requirements 2026: Eligibility, Prerequisites & How to Qualify before you plan your study calendar around these domains.
Domain 1: Counseling
Counseling is the clinical core of the CAS exam. This domain covers the direct, in-session skills used to engage, assess, and support clients presenting with alcoholism, drug addiction, eating disorders, disordered gambling, or sex addiction. Expect scenario-based multiple-choice items that ask you to select the most clinically appropriate response, not just recall a definition.
Domain 1 Core Topics
Candidates must demonstrate applied knowledge of therapeutic engagement across the full range of addictive disorders covered by the credential.
- Building rapport and managing resistance or ambivalence in early sessions
- Motivational and stage-based approaches to behavior change
- Recognizing co-occurring presentations across substance and process addictions
- Applying counseling techniques appropriately across gambling, eating, and sex addiction presentations, not just substance use
Because the exam intentionally blends substance-based and behavioral addictions into this domain, candidates who only trained deeply in one specialization often underperform here. Cross-reference your weak spots against a structured review - the CAS Study Guide 2026: How to Pass on Your First Attempt breaks this domain into smaller review blocks.
Domain 2: Treatment Planning
Where Domain 1 tests what you say and do in the room, Domain 2 tests what you document, structure, and coordinate around the client. This domain evaluates your ability to translate assessment data into a workable, individualized treatment plan.
Domain 2 Core Topics
- Setting measurable, time-bound treatment goals and objectives
- Selecting level-of-care and modality based on severity and history
- Sequencing interventions across the five addictive disorder categories tested on the exam
- Revising plans in response to relapse, plateau, or new diagnostic information
Exam questions in this domain often present a case vignette and ask which treatment plan revision is "most appropriate next," which rewards candidates who can reason through a full case rather than memorize isolated facts.
Domain 3: Professional and Ethical Responsibilities
This domain covers the professional conduct expectations that AAHCPAD holds every certificant to - both during practice and as a condition of keeping the credential active. It overlaps directly with the Code of Conduct you'll sign annually as part of renewal.
Domain 3 Core Topics
- Confidentiality, informed consent, and boundaries specific to addiction treatment settings
- Dual-relationship and scope-of-practice issues common in small or rural treatment networks
- Documentation standards and legal reporting obligations
- Understanding the Academy's Code of Conduct requirements tied to annual renewal
Key Takeaway
Because annual renewal requires a signed Code of Conduct and 20 continuing-education credits along with a $95 fee, treat Domain 3 as a preview of obligations you'll carry for the life of the credential - not a one-time exam hurdle.
Domain 4: Foundations (Transdisciplinary)
Domain 4 is the theory and science layer underneath the other four domains. "Transdisciplinary" signals that this content draws from pharmacology, psychology, physiology, and public health rather than a single clinical lens.
Domain 4 Core Topics
- Neurobiological and physiological basis of addiction across substances and behaviors
- Screening and diagnostic frameworks used to distinguish addictive disorders from other conditions
- Risk and protective factors, including co-occurring mental health conditions
- How disordered gambling and sex addiction are conceptualized alongside substance-based addiction
This domain tends to feel the most "textbook-like," which makes it a strong candidate for early review weeks before you move into scenario-heavy domains like Counseling and Treatment Planning.
Domain 5: Client, Family, and Community Education
The final domain shifts focus outward - from the client in the room to the client's support system and the broader community. Questions here test your ability to translate clinical concepts into education that families, employers, schools, or community groups can actually use.
Domain 5 Core Topics
- Psychoeducation for family members navigating a loved one's addiction
- Community referral pathways and support group structures
- Communicating relapse risk and recovery milestones to non-clinical audiences
- Culturally responsive education strategies across varied community settings
Candidates sometimes underweight this domain in study time because it feels "soft" compared to clinical counseling content - but it carries real weight on the exam outline and deserves dedicated review sessions, not just a skim.
Why All Five Addictive Disorders Appear on Every Exam
One detail trips up many candidates: even if you're applying under a specific specialization, the CAS exam covers alcoholism, drug addiction, eating disorders, disordered gambling, and sex addiction across all five domains. There is no version of the exam that lets you skip the behavioral addictions if your clinical background is substance-focused, or vice versa.
| Addictive Disorder Category | Appears Across Domains? |
|---|---|
| Alcoholism | Yes - Domains 1, 2, 4, 5 |
| Drug addiction | Yes - Domains 1, 2, 4, 5 |
| Eating disorders | Yes - Domains 1, 2, 4, 5 |
| Disordered gambling | Yes - Domains 1, 2, 4, 5 |
| Sex addiction | Yes - Domains 1, 2, 4, 5 |
This is one reason the exam has a reputation for being broader than candidates expect going in. If you're weighing how demanding the material actually is relative to your background, How Hard Is the CAS Exam? Complete Difficulty Guide 2026 walks through this specific breadth issue in more depth.
Exam Format, Fees, and Scoring Mechanics
The CAS exam itself is 150 multiple-choice questions administered in a 3-hour window. After the Academy approves your application, it arranges an online examination through an approved local testing center or proctor - so scheduling involves coordinating with that proctor in addition to the Academy's own timeline. For a full walkthrough of how testing windows and deadlines work, see CAS Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Here's the current fee structure candidates should budget for:
- Application fee: $195
- Examination fee: $349
- U.S. background check: $50 (proctor fees are additional and separate)
- Optional official study guide: $50 digital or $129 printed
- Retest fee: $79 plus proctor fees, after a mandatory 2-week wait
- Annual renewal: $95, plus 20 continuing-education credits and a signed Code of Conduct
A full cost picture, including how these pieces add up across application, testing, and renewal cycles, is covered in CAS Certification Cost 2026: Complete Pricing Breakdown. If you want a sense of how many candidates clear the 100-question bar on their first attempt, CAS Pass Rate 2026: What the Data Shows is the companion piece to read alongside this one.
Mapping a Study Schedule to the Five Domains
Because the exam blends foundational science (Domain 4), applied clinical skill (Domains 1 and 2), professional conduct (Domain 3), and outward-facing education (Domain 5), a domain-sequenced schedule tends to outperform a topic-by-topic review. A simple approach: front-load the foundational domain, then move into the scenario-heavy domains once terminology and diagnostic frameworks are solid.
Domain 4: Foundations (Transdisciplinary)
- Review neurobiology, screening tools, and diagnostic frameworks
- Build a reference sheet covering all five addictive disorder categories
Domains 1 & 2: Counseling and Treatment Planning
- Practice scenario-based questions requiring a "most appropriate response"
- Draft sample treatment plans for each addictive disorder category
Domain 3: Professional and Ethical Responsibilities
- Review the Academy's Code of Conduct expectations
- Study confidentiality, boundaries, and documentation standards
Domain 5 and Full Review
- Cover family and community education strategies
- Run a full-length timed practice exam under 3-hour conditions
For a condensed, last-week reference across all five domains, keep the CAS Cheat Sheet 2026: One-Page Review of Must-Know Facts nearby, and use our practice test platform to run timed drills that mirror the 150-question, 3-hour format before test day.
Who Hires CAS-Credentialed Specialists
Because the domains span direct counseling, treatment planning, ethics, foundational science, and family/community education, the credential signals a fairly complete clinical skill set to employers in addiction treatment settings - inpatient and outpatient treatment centers, behavioral health clinics, community mental health organizations, and private practices that treat substance and process addictions side by side.
If you're trying to decide whether the credential fits your career path, CAS Jobs covers the kinds of roles and settings where this certification is commonly requested or preferred, and Is the CAS Certification Worth It? Complete ROI Analysis 2026 weighs the credential against the time and fee investment described above. For compensation context once credentialed, see CAS Salary Guide 2026: Complete Earnings Analysis.
Frequently Asked Questions
There are five domains: Counseling, Treatment Planning, Professional and Ethical Responsibilities, Foundations (Transdisciplinary), and Client, Family, and Community Education. The Academy's outline organizes the 150 questions across these five areas, but individual weighting per domain is not published as a fixed percentage breakdown.
Yes. Alcoholism, drug addiction, eating disorders, disordered gambling, and sex addiction are all covered across the domains regardless of which specialization you're applying under.
You need a combined raw score of 100 correct answers out of 150 questions. There is no separate minimum published for each individual domain.
After your application is approved, the Academy arranges an online examination through an approved local testing center or proctor. Proctor fees are separate from the application and examination fees.
Since scoring is combined rather than domain-by-domain, a weak showing in one domain can be offset by strength in others. If your overall raw score falls short of 100, you can retest for $79 plus proctor fees after a mandatory 2-week wait.