Street medicine is the practice of delivering healthcare directly to people experiencing unsheltered homelessness in the places where they live: under bridges, in parks, at encampments, and on sidewalks. Rather than waiting for patients to walk through a clinic door, street medicine teams go to them, carrying supplies in backpacks or mobile vans and providing everything from wound care to chronic disease management on the spot. The field has grown from a handful of pioneering programs in the 1980s and 1990s into a recognized medical discipline with its own billing codes, educational standards, and international network of practitioners.
How Street Medicine Works
Street medicine teams look different depending on the program, but they share a common approach: go where the patients are and build trust through consistent, nonjudgmental presence. Some teams are as small as a physician, a medical student, and a social worker traveling in a personal vehicle to visit encampments on a weekly schedule. Others operate with mobile vans stocked with pharmaceuticals, lab equipment, point-of-care ultrasounds, and wound care supplies. One university program in Alabama runs its street clinic under a tent with portable chairs and tables, medications and bandages packed into a backpack.
The care itself falls into three broad categories. The first is direct provision of medical services on the street, including primary care, mental health support, and management of conditions like HIV. The second is a bridge model, where teams provide temporary treatment while connecting patients to brick-and-mortar clinics or mobile ambulatory facilities. The third focuses purely on outreach, finding people with complex medical and social needs and linking them to traditional healthcare systems. Many programs blend all three, adjusting their approach based on what each patient is willing and able to accept.
Origins of the Movement
The term “street medicine” was popularized by Jim Withers, a Pittsburgh physician who began going under bridges at night in the early 1990s to treat people living outside. A few similar programs had emerged around the same time in Boston, Calcutta, and Chile, but the movement remained small and scattered for years. The turning point came in 2005, when the first International Street Medicine Symposium was held in Pittsburgh. That gathering gave the field a name, a shared identity, and momentum. The annual symposium, now hosted by the Street Medicine Institute, continues to grow, and the Institute has since formed an Educational Consortium to standardize training for medical students and professionals entering the field.
What Conditions Get Treated
Street medicine teams handle a wide range of medical problems, many of them made worse by the realities of living outdoors. Wound care is among the most common services. Cuts, infections, and foot injuries that would be minor for a housed person can become serious or life-threatening without access to clean bandages, antibiotics, or a dry place to heal. Chronic conditions like diabetes, high blood pressure, and heart disease are also prevalent, and street teams help patients manage medications and monitor their health between visits.
Mental health disorders and substance use disorders represent a significant portion of the conditions street medicine teams encounter. Treating these on the street comes with particular challenges. Providers often lack immediate access to behavioral health specialists for consultation, and there is no consensus across the field on how to handle prescribing certain medications, including those for pain management, mood disorders, and addiction. Some programs have reported success keeping patients on long-term addiction treatment, but the lack of standardized protocols remains an ongoing issue.
A Philosophy, Not Just a Delivery Model
What separates street medicine from a mobile clinic pulling up to a parking lot is its underlying philosophy. The approach has been described as a way of thinking about care as much as a method for delivering it. Trust is the currency. Many unsheltered people have had negative experiences with healthcare systems, whether through being turned away, treated dismissively, or subjected to conditions they found dehumanizing. Street medicine teams build relationships over weeks and months of showing up at the same locations, offering care without pressure, and letting patients set the pace.
This means accepting outcomes that wouldn’t be considered ideal in a traditional clinical setting. California’s Department of Health Care Services, for instance, has explicitly framed street medicine as a harm reduction tool. In practice, that means a provider might focus on keeping a wound clean rather than insisting on surgery, or help someone reduce their drug use rather than requiring abstinence. The priority is reducing immediate danger and keeping the door open for deeper engagement when the patient is ready.
Impact on Emergency Rooms and Hospitals
One of the clearest measurable effects of street medicine is its ability to reduce unnecessary emergency department visits. People without housing frequently use emergency rooms for problems that could be handled in a primary care setting, simply because they have no other option. Clinics dedicated to serving homeless populations have been shown to cut inappropriate emergency visits significantly. In one study, 29% of visits by patients from dedicated homeless clinics were considered inappropriate for an ER, compared to 40% of visits from patients using standard hospital clinics. Patients connected to dedicated homeless care were roughly 39% less likely to show up at the emergency department for a non-emergency problem.
Street medicine programs have reported even more dramatic results. Some teams have documented a 75% decrease in emergency department visits and a 66% decrease in hospitalizations among the patients they serve. Beyond clinical outcomes, programs have reported success placing patients in transitional and supportive housing, enrolling them in insurance, and connecting them with ongoing addiction treatment.
How It Gets Funded
For years, one of the biggest obstacles to scaling street medicine was the simple question of how to bill for care delivered on a sidewalk. Traditional insurance billing requires a “place of service” code, and until recently, there was no code that described a street corner or an encampment. That changed in October 2023, when the Centers for Medicare and Medicaid Services created Place of Service Code 27, defined as “a non-permanent location on the street or found environment, not described by any other POS code, where health professionals provide preventive, screening, diagnostic, and/or treatment services to unsheltered homeless individuals.”
This was a significant step. It means that street medicine visits can now be billed to Medicare and, in states that have adopted the code, to Medicaid. Before this, many programs relied entirely on grants, hospital subsidies, or volunteer labor. The new code doesn’t solve every funding challenge, but it gives programs a sustainable revenue stream and signals that the federal government recognizes street medicine as a legitimate form of healthcare delivery.
Practical Challenges in the Field
Providing medical care in an uncontrolled environment creates problems that don’t exist inside a clinic. There are no exam rooms, no running water, no reliable way to maintain sterile conditions. Weather, safety concerns, and the transient nature of encampments mean that patients may be impossible to locate for follow-up visits. A provider who identifies a serious condition during a street visit may have limited options for referral if the patient is unwilling or unable to go to a hospital.
Coordination with the broader healthcare system is another persistent difficulty. Street medicine teams often serve as a patient’s only point of contact with the medical world, but they typically lack the infrastructure of a full clinic. Access to specialists, imaging, and laboratory services depends on relationships with nearby hospitals and clinics, and those partnerships vary widely from city to city. The result is a patchwork system where the quality and scope of street medicine depends heavily on local resources, institutional support, and the persistence of individual providers.