Keystone Treatment Center
Keystone Treatment Center is a fully licensed addiction treatment provider located in Canton, South Dakota, offering detox, residential, outpatient and continuing care for adults and young adults. With over 50 years of experience, the center combines evidence-based therapies with culturally informed and 12-Step approaches in a peaceful semi-rural campus setting.
At Keystone, the treatment philosophy emphasizes individualized care, spiritual and cultural integration, and a holistic approach to recovery — from medically-monitored detox through outpatient and alumni support. Their residential program supports co-occurring disorders, gambling addiction, military service-related trauma and Native American traditions, offering robust specialty tracks alongside standard substance use programming. The campus setting offers structured therapy, outdoor recreation, and family involvement to support lasting change.
Center Overview
Insurance Accepted
Private Pay Option
Cash Pay Rates
If you are not using insurance, the pricing listed below is an estimate of the cash pay rate.
Staff will walk through insurance benefits and can assist with financial arrangements.
Prospective clients begin with an online assessment and intake; admissions staff assist with insurance verification, then an individualized treatment plan is created.
Staff Credentials:
Josh Merkley – Chief Executive Officer
Marsha Nelsen – Medical Director
Matt Lynch – Clinical Director
Terri Clark, DNP, RN – Director of Nursing
Success Rates or Outcomes:
No specific numeric success rate publicly listed. Alumni program notes “more than 50 years of experience helping individuals overcome their struggles with addiction.”
Executive Verified Listing
Rehab verified that the name, location, contact information and license to operate for this treatment provider are valid and up-to-date.
Joint Commission Accredited
Independent, third-party mental health resource. Verification does not imply endorsement and does not guarantee the quality of treatment services.
Meet your care team
Josh Merkley – Chief Executive Officer
Oversees leadership and strategic direction at Keystone Treatment Center.
Marsha Nelsen – Medical Director
Physician leading medical services including medically-monitored detox and ongoing psychiatric oversight.
Matt Lynch – Clinical Director
Responsible for clinical programming, the implementation of evidence-based therapies, and quality of care.
Terri Clark, DNP, RN – Director of Nursing
Leads the nursing team and ensures 24/7 nursing care in residential and detox settings.
Specialties
Therapies & Approaches
Amenities
Keystone Treatment Center
Discover how Keystone’s detox
residential programs are structured on a 30-acre campus, combining 12-Step, CBT/DBT and
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Learn about Keystone’s specialty tracks
including for young adults, veterans/military, Native American clients and gambling addiction — each
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Explore how Keystone’s outpatient
continuing care programs provide flexible step-down options, supporting transition back into community life
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Gain insight into Keystone’s admissions
insurance process: experienced staff guide clients and families through benefits verification, treatment planning
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Frequently Asked Questions
At Keystone Treatment Center, medically-monitored detox is available 24/7 under physician and nursing supervision, assuring safe withdrawal management before entering residential care. The staff includes addictionologists, psychiatrists and nurses to oversee the process.
Family programs and support meetings are offered via the alumni program and dedicated Sunday visitor hours, enabling loved ones to engage in psycho-education and recovery support from the outset.
Yes. The facility treats individuals with substance use disorders who also have co-occurring psychiatric conditions, using integrated treatment plans that include therapy, medication management and culturally-sensitive care.
Keystone contracts with most major commercial plans, Medicaid (SD), TRICARE and veteran benefits; the admissions staff reviews your insurance coverage and assists with financial arrangements or self-payment options.
The facility sits on a spacious semi-rural 30-acre campus with outdoor recreation, gender-specific wings, spiritual and cultural programming (including Native American sweat lodge ceremony), enabling clients to engage in healing with nature, reflection and community.
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