The Most Common Medical Errors in U.S. Hospitals

Medical errors remain a constant threat to patient safety across American hospitals. The most recent data confirms this alarming trend. In 2024, the Joint Commission (which evaluates and accredits hospitals nationwide) documented a 12% surge in sentinel events, reaching 1,575 cases in 2024 compared to 2023. Sentinel events are “an unexpected patient safety incident resulting in death, permanent harm, or severe temporary harm, requiring immediate investigation to understand and prevent recurrence, like wrong-site surgery or patient suicide in care”. These errors claim an estimated 250,000 American lives annually, making them the third-leading cause of death in the United States. Understanding the most prevalent error types and their causes is essential for patients who may be concerned that they or a loved one was injured or died because of medical negligence.

When reviewing these statistics, it is important to remember that these are the only cases the events that were reported. The actual numbers may be higher, because individuals or institutions fail to report incidents for fear of the consequences, or simply because they are not aware of the circumstances.

The Most Frequent Hospital Errors

Diagnostic Errors Lead in Severity

Diagnostic errors have emerged as the most harmful category of medical mistakes, affecting an estimated 795,000 Americans yearly through death or permanent disability. Nearly 371,000 deaths are attributed to diagnostic errors annually. The “Big Three” conditions—vascular events, infections, and cancers—account for 75% of all serious harm from misdiagnosis, with just five conditions (stroke, sepsis, pneumonia, venous thromboembolism, and lung cancer) responsible for 39% of serious outcomes.

A 2024 study found that 23% of patients transferred to intensive care or who died in the hospital had a missed or delayed diagnosis, with 17% of these errors leading to temporary or permanent harm. The primary causes include failure to recognize atypical symptoms, improper test ordering, and incomplete patient histories.

Patient Falls Dominate Sentinel Event Reports

Patient falls resulting in injury or death are now the most frequently reported sentinel event category, rising from 18% in 2019 to nearly 50% in 2024. The Joint Commission attributes this increase to safety program disruptions during the COVID-19 pandemic and incomplete recovery of fall-prevention protocols.

Medication Errors and Surgical Mistakes

Medication errors affect approximately 1.5 million people annually and remain among the most common hospital errors. Wrong-site surgeries, fatal medication mix-ups, and retained surgical objects continue to occur despite decades of prevention protocols. In Pennsylvania, harmful medication errors increased from 166 in 2020 to 294 in 2023, according to the Pennsylvania Patient Safety Authority.

Procedure, Treatment, and Test Errors

Errors related to procedure, treatment, or test (P/T/T) remain the most frequently reported event type overall, accounting for 33.4% of all serious incident reports. These include treatment delays, improper procedures, and failures in diagnostic follow-up.

Hospital-Acquired Infections

Healthcare-associated infections affect 1 in 31 hospital patients on any given day, according to the Centers for Disease Control and Prevention. These infections—such as central line-associated bloodstream infections and ventilator-associated pneumonia—represent a major category of preventable harm.

What is the Cause of Common Hospital Errors?

Communication Breakdowns Dominate

Communication failures remain the leading root cause of sentinel events. Root Cause Analysis is a systematic process to investigate serious patient safety incidents (like a sentinel event) to find the underlying system failures that led to injury.

Approximately 67% of communication errors occur during handoffs between providers. A Pennsylvania case in 2023 illustrated this danger when a patient died after receiving a known allergen antibiotic twice during surgery—a failure attributed to missed communication.

Despite federal mandates for health information exchange, only 46% of hospitals can electronically find, send, receive, and integrate patient data from outside providers. This fragmentation contributes to 50% of patients having at least one medication discrepancy at admission, 7–10% of critical test results lacking timely follow-up, and 20% readmission rates linked to poor care transitions.

Clinician Burnout and Fatigue

Clinician burnout affects 44% of physicians and 57% of nurses in 2024. Burnout and fatigue reduce diagnostic accuracy by up to 20% after 10 consecutive patients, while clinicians face 6–12 interruptions per hour in emergency departments.

Skipped Safety Protocols

Hospitals require pre-surgery “time-outs” and bar-code medication scanning, yet investigations of wrong-site surgeries in 2024 revealed that teams often rushed or skipped these steps. This reflects a “production versus protection” dilemma—balancing speed and efficiency against patient safety.

Inadequate Information Flow and Alert Fatigue

Electronic health record (EHR) overload compounds communication challenges. Clinicians receive an average of 86 alerts per day, leading to alert fatigue and missed critical warnings.

Bias in Diagnosis

Physician bias and knowledge gaps also contribute to diagnostic disparities. Only 22% of primary care physicians and 42% of cardiologists report feeling extremely well-prepared to assess women’s cardiovascular risk, despite heart disease being the leading cause of death among women in the U.S.

The Human and Financial Impact

Preventable medical errors impose enormous costs and suffering. Pennsylvania’s reporting system documented 315,418 incidents in 2024, with 4% causing patient harm. Nationally, 12% of Medicare beneficiaries experience adverse events during hospitalization, and 40% of these are preventable. The financial toll of medical errors exceeds $20 billion annually across the U.S. healthcare system.

Hospital errors remain one of the most pressing challenges in the U.S. healthcare system. The statistics are sobering. Medical research reports that medical as the third leading cause of death in the US.

One study reported that approximately 400,000 hospitalized patients experience some preventable harm each year, while another estimated that over 200,000 patient deaths annually were due to preventable medical errors.

The Never Events

Another way to think about common medical errors that cause injury is to identify the type of conduct that should never happen in a hospital. And there is research that establishes that even though these events have been identified and labeled, they still occur daily.

The National Quality Forum (NQF), a not-for-profit organization that works to improve healthcare outcomes, safety, and affordability, classifies the most serious of these as “never events”—errors that should never happen in a properly functioning healthcare environment.

The NQF categorizes “never events” into six major groups, each encompassing a range of preventable incidents.

1. Surgical Errors

• Surgery on the wrong body part or patient
• Performing the wrong procedure
• Foreign objects left inside a patient after surgery
• Unexpected death during or immediately after surgery in a healthy patient

2. Product or Device Errors

• Use of contaminated drugs or devices
• Device malfunction causing death or disability
• Air embolism resulting from improper medical device use

3. Patient Protection Errors

• Infant discharged to the wrong person
• Patient elopement (disappearance) leading to harm
• Suicide or attempted suicide while under hospital care

4. Care Management Errors

• Medication errors, including wrong drug, dose, or route
• Blood transfusion errors (mismatched blood type)
• Injury the infant or Mother during low-risk deliveries (birth injuries)
• Hospital-acquired pressure ulcers (bedsores)
• Failure to treat hypoglycemia or hyperbilirubinemia in newborns

5. Environmental Errors

• Electric shocks or burns sustained in a hospital
• Falls resulting in death or serious injury
• Restraint or bedrail-related injuries
• Gas line contamination incidents

6. Criminal or Deliberate Acts

• Impersonation of medical personnel
• Patient abduction or assault
• Physical violence causing injury or death within a facility

State-Level Reporting and Accountability

To promote transparency, only a few states (New Jersey, Minnesota, Connecticut and Illinois) have enacted mandatory reporting laws for “never events.” These programs aim to identify systemic problems, encourage corrective action, and foster learning across facilities. However, underreporting remains a concern because, as mentioned, hospitals and staff may fear reputational harm or legal consequences.

Progress and Continuing Challenges

In 1999, a report entitled To Err is Human was published which called for a national effort to make health care safer by reducing medical-related-error deaths by 50% within 5 years.  Despite over 25 years of “reform” efforts, the U.S. healthcare system has not yet achieved this goal. While some progress has been made in surgical safety and infection control, preventable harm persists.

Never events represent some of the most serious and preventable failures in modern healthcare. While national and state-level initiatives have improved transparency and accountability, the persistence of these errors underscores the need for stronger safety systems, and a culture that prioritizes patient well-being above all else. Reducing “never events” should be a moral and professional imperative for every healthcare provider in the United States. The only remedy for patients, and their families to hold hospital’s accountable for injuries caused by common errors in hospitals is through a civil lawsuit— a malpractice claim. Hospitals are responsible for systemic errors that cause injuries and death.

Contact Cohen, Placitella & Roth for Your Malpractice Lawsuit

If you or a loved one suffered injury due to common medical malpractice, or “never events”, you and your family deserve justice. The medical malpractice attorneys at Cohen, Placitella & Roth have the skills, experience, and resources necessary to hold negligent healthcare providers accountable and advocate for our client’s right to compensation.

If you would like to schedule your free consultation with CPR Law, contact us online or give us a call at (888) 560-7189.