Currier Addiction Services, LLC (CAS Medicine)

Addiction Medicine in Ashburn, Virginia

Board-certified addiction medicine, preventive care, and psychiatric support in Virginia, Maryland, and Washington, DC.

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50+ Years of Medical Experience
6 Board Certifications
3 State Licenses (VA, DC & MD)
ASAM Fellow, Addiction Medicine
Dr. Carol A. Currier, MD
Board Certified
◆ Fellow, American Society of Addiction Medicine
◆ American Board of Preventive Medicine
◆ American Board of Addiction Medicine
◆ FAA Aviation Medical Examiner
◆ Certified Medical Review Officer

Meet Your Physician

Carol A. Currier, MD

Medical Director & Founder, CAS Medicine

Dr. Carol Currier brings more than five decades of medical expertise and a lifelong commitment to her patients. After training in ophthalmology and earning a Master of Public Health, she transitioned her focus to occupational and preventive medicine — ultimately founding Currier Addiction Services (CAS Medicine) in 2016 to address the growing need for evidence-based addiction care in Northern Virginia.

Dr. Currier is board-certified in both Occupational & Environmental Medicine and Addiction Medicine through the American Board of Preventive Medicine, and holds an active certification from the American Board of Addiction Medicine. She is a Fellow of the American Society of Addiction Medicine (ASAM) and a Diplomate of the American College of Preventive Medicine.

Beyond her practice, Dr. Currier has dedicated her career to serving communities in need, providing medical care in Nicaragua and Ecuador. Her approach combines rigorous clinical excellence with genuine compassion — treating every patient with the respect and dignity they deserve on their path to recovery.

Education & Training

  • BA — University of Wisconsin, Madison
  • MD (Medicine & Surgery) — MCP-Hahnemann College of Medicine, Philadelphia, PA
  • Ophthalmology Residency — University of Alabama, Birmingham
  • Master of Public Health — Medical College of Wisconsin, Milwaukee

Our Team

Comprehensive Care, Expert Providers

CAS Medicine brings together specialists in addiction medicine and psychiatric care to support your whole health.

Antonio Joyner, PMHNP-BC
Board Certified
◆ U.S. Army Veteran
◆ American Nurses Credentialing Center Board Certification
◆ Shenandoah University ‘Spirit of Nursing’ Award Recipient
◆ Licensed: VA, DC, MD

Antonio Joyner, PMHNP-BC

Psychiatric Mental Health Nurse Practitioner

Antonio Joyner is a board-certified Psychiatric Mental Health Nurse Practitioner with over eight years of experience in mental health nursing and a distinguished record of service as a U.S. Army veteran. He earned a Master of Science in Nursing from James Madison University and a Post-Graduate Certificate in Psychiatric-Mental Health Nurse Practitioner from Shenandoah University. He holds licensure in Virginia, Washington, D.C., and Maryland.

Antonio specializes in treating substance use disorders and a wide spectrum of co-occurring mental health conditions, including addiction, anxiety, depression, PTSD, ADHD, bipolar disorder, and dual diagnoses. His practice is rooted in holistic, recovery-oriented, patient-centered care, empowering individuals to navigate complex challenges and achieve lasting stability on their recovery journey.

Substance Use Disorders Dual Diagnosis PTSD & Trauma ADHD Anxiety & Depression Medication Management

Education & Training

  • BSN — Colorado Technical University School of Nursing
  • MSN — James Madison University School of Graduate Nursing
  • Post-Graduate Certificate (PMHNP) — Shenandoah University School of Graduate Nursing
Heather Jefferson, Peer Recovery Specialist at CAS Medicine

Heather Jefferson, PRS, QMHP-Trainee

Peer Recovery Specialist, Case Management Certified

Heather Jefferson is a Peer Recovery Specialist (PRS) and QMHP-Trainee (Qualified Mental Health Professional-Trainee), bringing over 20 years of experience to the field of behavioral health. She works alongside Dr. Carol Currier and Antonio Joyner, assisting patients with substance abuse and co-occurring disorders. Her compassion contributes to a supportive treatment environment.

Heather is currently pursuing her bachelor's degree in psychology with a focus on Addictions and Recovery at Liberty University. In addition to her PRS and QMHP-Trainee credentials, she is certified in Case Management. Heather's extensive personal and professional experience, ongoing education provides empathetic support to individuals navigating recovery.

Peer Support & Mentorship Recovery Goal Planning Community Resources Crisis Support
RS

Ruth Sims

Administrator, Patient Care Coordinator

Ruth Sims is dedicated to patient care, treatment and recovery. Patients should contact her to make appointments with the doctors. Ruth ensures every patient receives respect with a prompt, caring response and a smooth scheduling experience. She provides the support and patient assistance needed to start on the path to recovery.

Whether you are a new patient looking for medical treatment or a patient scheduling a follow-up, Ruth is part of the team, assisting you on your journey to wellness and regaining the life you deserve.

Appointment Scheduling Patient Coordination New Patient Intake
(571) 926-4540
casmedicine@gmail.com
Sandra Oppong, Staff Assistant

Sandra Oppong

Staff Assistant

Sandra has many years of experience and dedication in health care. She is respected for her kind and diligent care for those in need.

Sandra provides support to the CAS Medicine team, and brings with her the strong belief in God's ability to change a life that has been devastated by addiction.

What We Offer

Our Services

We provide addiction treatment, preventive and psychiatric services, delivering evidence-based care to each individual.

Addiction Medicine

Comprehensive, evidence-based evaluation and treatment of alcohol, opioid, and other substance use disorders. We treat the whole person — not just the addiction.

Medication-Assisted Treatment (MAT)

FDA-approved medications combined with counseling and support to treat opioid and alcohol use disorders, reducing cravings and supporting long-term recovery.

Psychiatric Services

Mental health evaluation, diagnosis, and medication management for anxiety, depression, PTSD, ADHD, bipolar disorder, and co-occurring conditions with Antonio Joyner, PMHNP-BC.

Dual Diagnosis Treatment

Integrated care for patients with both substance use disorders and co-occurring mental health conditions — because treating one without the other rarely works.

Peer Recovery Specialist Services

Peer support and mentorship grounded in lived experience. Our Peer Recovery Specialist helps patients reach recovery goals, builds an individualized care plan, and advocates on their behalf. Peer recovery fosters the empowerment and self-advocacy that make recovery last.

Medical Review Officer (MRO) Services

Certified Medical Review Officer services for workplace drug and alcohol testing programs, ensuring regulatory compliance and accurate interpretation of results.

Telehealth Services

Virtual appointments for patients in Virginia, Maryland, and Washington, D.C., providing expert care to you wherever you are.

Insurance Accepted

Aetna Anthem Cigna UnitedHealthcare Medicaid Sentara Health Plans

Contact us to verify your specific plan. We also accept major credit cards.

Get in Touch

Schedule an Appointment

Take the next step to recovery.

Main Office

20130 Lakeview Center Plaza, Suite 400
Ashburn, VA 20147

Second Location

44121 Leesburg Pike, Suite 275
Ashburn, VA 20147

Wednesdays — medication-assisted treatment and Sublocade injections

Fax

(571) 746-9040

Office Hours

Wednesday, Friday, and Sunday
Telehealth also available

Call or write to make your appointment.

Addiction & Psychiatric Assessment

Assessment and initial consultation available.

We will respond to you within one business day.