AHRQ Patient Fact Sheet: 20 Tips to Help Prevent Medical Errors. [Web site]. Http://www.ahrq.gov/patients-consumers/care-planning/errors/20tips/index.html . Updated September 2011. Accessed July 30, 2014. Medical errors can occur anywhere in the health care system: In hospitals, clinics, surgery centers, doctors’ offices, nursing homes, pharmacies, and patients’ homes. Errors can involve medicines, surgery, diagnosis, equipment, or lab reports. These tips tell what you can do to get safer care.