Patient safety in primary care is an emerging focus for research and policy. The authors of this study retrospectively reviewed case notes from 14,407 primary care patients in the United Kingdom. Their analysis identified three primary types of avoidable harm in primary care – problems with diagnoses, medication-related problems, and delayed referrals. The authors suggest several methods to reduce avoidable harm in primary care, including optimizing existing information technology, enhanced team communication and coordination, and greater continuity of care.