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Stanford Hospital Addiction Services

Stanford Hospital Addiction Services (SHAS) cares for hospitalized patients with substance use disorders through counseling, medications, and linkage to treatment on discharge. SHAS is made up of three dedicated Addiction Inpatient Medicine (AIM) services across Stanford Health Care locations: Palo Alto (AIM-PA), Tri-Valley (AIM-TV), and Sequoia (AIM-SQ).

Patients with substance use disorder (SUD) make up nearly one-third (29.1%) of hospitalized patients in the United States and have double the 30-day readmission rates. Hospital addiction medicine services that treat these patients have been consistently shown to reduce readmissions, increase the number of days of abstinence in the first month after hospital discharge, reduce addiction severity, improve engagement with addiction treatment, and decrease mortality.

In response to the national and local overdose epidemic, an addiction consult service was launched at Stanford Hospital and designed to deliver gold standard treatment for SUD, including bedside psychotherapy, medication management for cravings, withdrawal, and linkage to treatment programs on discharge. In the first year, Stanford’s new consult service reduced the 30-day readmission rate in SUD patients by over 60% without increasing hospital length of stay. This metric continued to improve to 67.8% in the second year, and 78.1% in the third year. The services provided by the consult service placed Stanford Medical Center in the Excellent category on the California Opioid Care Honor Roll and a press release regarding this designation was published in partnership with the California Health and Human Services. The consult service was also awarded three separate grants to expand the team that now consists of addiction medicine physicians, psychiatrists, licensed clinical social workers, certified alcohol and drug counselors, and peer mentors. The diverse experience of our team create a unique learning opportunity, and we provide clinical rotations with curriculums for medical students, residents, and fellows from varied specialties.

Our team also creates many advocacy events beyond Stanford. We host an event for international overdose day at Stanford Hospital open to the community. We started a free opioid overdose education and naloxone distribution program that provides free naloxone to the community, Stanford and Lucille Packard Hospitals, and several clinics. When regional fentanyl overdoses increased dramatically, we educated on how to respond to fentanyl overdoses and started a harm reduction program providing free fentanyl test kits to the community so users can test for and avoid fentanyl. When DEA restrictions affected hospital opioid use across the country, our service published a press statement urging hospitals to maintain evidence-based use of opioids. We developed a novel protocol to start buprenorphine specifically in hospitalized patients that minimized opioid withdrawal. This increased the use of buprenorphine by a factor of 10 in the hospital and has been adopted by hospitals across the nation. During the COVID pandemic, we piloted the first completely telehealth inpatient addiction service which improved engagement and outcomes. We plan to grow our inpatient addiction medicine interventions, study their outcomes to advocate for improved hospital care for SUD patients nationally, and monitor and respond to regional trends to combat the overdose epidemic.

Clinical Team

  • Zenia Cardoza, CADCII, ICADC

    Zenia Cardoza, CADCII, ICADC

    Substance Use Navigator


    Zenia Cardoza has been working in the addiction treatment field for over 15 years primarily in Santa Clara County after entering recovery, nearly 20 years ago. Zenia works as a Substance Use Navigator (SUN) in the Emergency Department, a role that was started in partnership with the CA Bridge Program. Zenia’s work has paved the way for Stanford’s Emergency Dept to provide low barrier access to Medication Assisted Treatment (MAT), real-time linkage to substance use treatment programs and harm reduction interventions such as take-home naloxone. She provides compassionate and non-judgmental care to all patients and families visiting the emergency department. Zenia is a strong advocate for improving care for individuals living with substance use disorders. She was awarded the CD Role Outpatient Counselor for Professionalism by SJCC ADS Advisory Board in 2018 and the Community Hero Award by Santa Clara County Behavioral Health Board in 2022.

  • Jak Cooper

    Jak Cooper

    Volunteer Peer Support Specialist


    Jak Cooper was born in the United Kingdom and has been living in the US since 2017. In February 2023, she was diagnosed with cirrhosis, then admitted for a Liver Transplant at Stanford Hospital in May 2023. Having experienced the work of the Addiction Medicine team firsthand, she knew that she initially wanted to help make a space for those like her, either pre- or post-transplant, to ask questions without judgement, just as she had with the peer support specialists who supported her on her journey in the hospital. One year post transplant, she joined Stanford’s Peer2Peer program as a Mentor for patients undergoing liver transplants. In Fall 2024, she completed training to gain a Peer Support Specialist certification in the hope of offering volunteer hours to AIM to support others with Substance Use Disorder. She has been sober since her cirrhosis diagnosis and has been active in the sober community since recovering from Transplant.

  • Arleen Lopez, ASW

    Arleen Lopez, ASW

    Social Worker


    Arleen brings a wealth of experience and deep commitment to the field of addiction medicine. Prior to working at Stanford Health Care, Arleen worked at Sacramento Comprehensive Treatment Center, where she held various roles within the methadone program. Arleen is a registered substance use counselor and has made significant contributions to the community through her leadership in presentations and educational events focused on OUD, MAT, and harm reduction.

    In addition to her professional expertise, Arleen is dedicated to supporting the Latinx community. She has actively engaged in community presentations and panels that address the unique treatment perspectives and challenges faced by this population. Her master’s research on “Loss and Grief in Opioid Use Disorder” has now influenced her research in a doctoral program that continues her work in substance use. Currently, her doctoral research on “Substance Use Perspectives and Beliefs from Social Workers and Case Managers at Stanford Hospital” will lay the groundwork for targeting education and training efforts for staff.

  • Alicia Ludlow

    Alicia Ludlow

    Peer Support Specialist


    Alicia Ludlow is a peer support specialist with the Addiction Inpatient Medicine Service at Stanford Health Care. Alicia started as a peer mentor with National Alliance on Mental Illness (NAMI) and began working at Stanford Health Care as a peer support specialist in September 2021. Alicia utilizes her lived experience of mental illness and addiction to support patients on their journey of recovery. While meeting patients in the hospital and supporting them after discharge, Alicia helps patients discover their strengths that lead to long term sobriety. She is active in the recovery community and is a devoted advocate for sobriety and wellness.

  • Charlie Porzio

    Charlie Porzio

    Volunteer Peer Support Specialist


    Charlie Porzio is a volunteer peer support specialist with the Addiction Inpatient Medicine Service at Stanford Health Care. Charlie started as a peer mentor with National Alliance on Mental Illness (NAMI) and began volunteering at Stanford Health Care as a peer support specialist in March 2021. Charlie utilizes his lived experience of mental illness and addiction to support patients on their journey of recovery. While meeting patients in the hospital and supporting them after discharge, Charlie also volunteers, bringing AA meetings in to jails and institutions. He is active in the recovery community and is a devoted advocate for sobriety and wellness. Charlie has been substance free since March 1,1986.

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