Repealing universal motorcycle helmet laws leads to higher crash-related inpatient costs, according to a new study in the Journal of the American College of Surgeons (JACS). Researchers used Michigan’s 2012 repeal as a case study and found that the average inpatient cost per motorcycle crash patient increased by 26% after the policy change.
The research analyzed data from 19,685 motorcycle crash patients between 2009 and 2015 across five states. Michigan, which repealed its universal helmet law in April 2012, was compared with Wisconsin, Minnesota, Kansas, and Colorado—states selected for their similar geography and demographics.
Researchers emphasized that inpatient costs make up only about two-thirds of total acute medical expenses following a crash. The full financial impact may be significantly higher when considering rehabilitation and long-term care needs.
The study highlighted potential consequences for trauma centers facing these increased costs. Hospitals may absorb unpaid bills when crash victims are uninsured or underinsured or become unable to work due to injuries. This situation could threaten the financial stability of trauma centers and their ability to serve local communities.
"Trauma centers have a duty to care for everyone who comes through their doors, regardless of ability to pay," Dr. Johnson said. "When policy choices lead to more severe - and more expensive - injuries, that creates real downstream pressure on already strained trauma systems."
About one-third of patients included in the study did not use auto insurance as their primary payer, often shifting costs onto public insurance programs or hospitals themselves.
This research adds to evidence supporting universal helmet laws. A separate 2025 JACS study compared North Carolina (which has a universal helmet law) with South Carolina (which has a partial law), finding helmet use rates at 94% in North Carolina versus 47% in South Carolina. Unhelmeted riders were more likely to require intensive care or die from their injuries.
The American College of Surgeons supports universal helmet laws, citing reduced risk of death and head injury when such policies are in place. They note that enactment increases helmet use close to 100%, leading to fewer fatalities and serious injuries.
"As more states revisit helmet legislation, policymakers need to understand the full picture, which includes financial consequences for both healthcare systems and taxpayers," Dr. Johnson said. "This isn't about limiting freedom. It's about understanding that individual choices can carry shared costs."
The study’s co-authors include Jamila K. Picart, MD, MS; Alex K. Hallway, MS; Cody L. Mullens, MD, MPH; Scott C. Levy, MD; Mark R. Hemmila, MD; and Raymond A. Jean, MD.
