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Regan Zambri Long’s Washington, DC medical malpractice lawyers help prove misdiagnosis claims by identifying where the diagnostic process failed and how that failure caused you lasting harm. Misdiagnosis cases hinge on subtle details, missed test results, or decisions that were never revisited, making careful investigation and medical insight essential from the very start.
With almost 200 years of combined experience, our team understands how to build misdiagnosis cases that stand up to scrutiny. With all six award-winning partners recognized among Washington, DC’s top medical malpractice lawyers by Super Lawyers and Best Lawyers, we know how to reconstruct diagnostic timelines, evaluate competing medical opinions, and present complex medical evidence clearly. That approach has led to more than $1 billion in personal injury recoveries, including diagnosis-related awards of $15 million, $8 million, $4.2 million, and $3.5 million, and resulted in more than 100 5 star Google reviews.
Have you or a loved one been harmed by a medical misdiagnosis? Contact Regan Zambri Long today, and one of our attorneys will personally reach out to you. We are available 24 hours a day, 7 days a week. We also front all case costs, so there’s no fee unless we win your case.
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Medical misdiagnosis is far more common than many people realize, and recent research shows it occurs across virtually every healthcare setting.
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A 2024 cross-sectional study estimated that 2.59 million diagnostic errors occur each year involving dangerous diseases alone, a figure that does not include less severe or non-life-threatening conditions. When researchers reviewed broader data, they found U.S. estimates for total annual diagnostic errors ranging from 12 million to more than 100 million, with serious misdiagnosis-related harms estimated between 40,000 and 4 million cases. Based on that analysis, researchers concluded that diagnostic errors in the United States likely number in the tens of millions each year. The consequences can be devastating.
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The same study estimated that approximately 795,000 Americans die or suffer permanent disability each year because dangerous conditions are misdiagnosed. Most of the most serious harm is concentrated in a small group of conditions. Misdiagnosis involving vascular events, infections, and cancers accounts for 75% of serious diagnostic harms, with conditions such as stroke, sepsis, pneumonia, venous thromboembolism, and lung cancer alone accounting for 38.7%.
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Hospital data reflects a similar pattern. A 2025 study on found that harmful diagnostic errors may occur in as many as 1 in every 14 hospital patients, or about 7%, and researchers concluded that 85% of these errors are likely preventable.
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Another 2024 study focusing on patients who were transferred to an intensive care unit or died during hospitalization found that a missed or delayed diagnosis occurred in 23% of cases, with 17% of those errors causing temporary or permanent harm.
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Emergency departments are also a significant source of diagnostic error. With roughly 130 million emergency department visits each year in the United States, researchers estimate that 7.4 million patients, or 5.7%, are misdiagnosed, 2.6 million suffer an adverse event, and approximately 370,000 experience serious harm as a result.
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Together, these findings show that misdiagnosis is not rare, isolated, or unavoidable. It is a widespread patient safety issue that often involves identifiable breakdowns in care and, in many cases, preventable failures to meet accepted medical standards.
To receive compensation for a medical malpractice suit based on misdiagnosis, you and your medical negligence attorney need to prove that misdiagnosis occurred. This involves demonstrating several key elements.Â
Remember — these cases can be highly complex, and it’s always wise to approach them with the support of a dedicated and experienced legal team. Some of the general steps and considerations in proving misdiagnosis are as follows:Â
To prove misdiagnosis, you must prove that a doctor-patient relationship existed between the victim and the accused doctor. This can be established using evidence like medical and appointment records, medical bills, and more.
Any injured patient looking to prove misdiagnosis must demonstrate the specific standard of care for their medical condition at the time of diagnosis. For instance, a patient who has breast cancer must show what the standard of care is for that particular ailment. Proving this often involves expert testimony from medical professionals, and can explain what a reasonable and competent doctor would have done under similar circumstances.
Once you have proven the standard of care, you must prove that the defending healthcare provider deviated from this standard of care. This means establishing that the doctor’s actions or decisions were negligent or fell below the accepted medical standards. Expert witnesses can be crucial in explaining how the doctor’s acts or omissions were negligent.
It’s not enough to demonstrate that a misdiagnosis occurred; you must also establish a causal link between the misdiagnosis and your injuries or damages. In other words, you must show that the misdiagnosis directly led to injury or pain in the patient. Examples of this injury can include delayed treatment, unnecessary procedures, or worsening your condition.
In a medical malpractice case, you must provide evidence of the damages you suffered due to the misdiagnosis. Proof of these damages can include medical bills, records of additional treatments or surgeries, lost wages, pain and suffering, and other relevant economic and non-economic losses.
As mentioned above, expert witnesses can play a significant role in medical malpractice suits. Expert witnesses, generally healthcare professionals with expertise in the relevant field, can help explain complex medical concepts to the court and provide opinions on whether the standard of care was breached and caused harm.
Carefully collect and review all relevant medical records, test results, and documentation related to your case. This includes records from the healthcare provider who misdiagnosed you and any subsequent providers who treated you.
Taking on a medical malpractice case without legal support can be an arduous journey, often not resulting in a satisfactory settlement. Working with a medical lawyer means that you can focus on rest and recovery, knowing that a dedicated professional is fighting tirelessly for you in the legal arena.
It’s always important to consider the statute of limitations on medical malpractice suits in your particular case. This refers to the period of time during which you are allowed to take legal action; once this period expires, you may not be able to file a suit.
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In Washington, DC, §12–301 states that the statute of limitations for these claims is generally three years from the date the misdiagnosis occurred. Sometimes, exemptions are granted — for instance, if the victim was a minor at the time of misdiagnosis. However, these exemptions are rare, and it’s best to act as quickly as possible once you become aware of the misdiagnosis.
Proving misdiagnosis or filing any kind of medical malpractice can be a daunting and overwhelming experience. Though you can legally file a claim on your own, it’s almost always best to do so with the aid of a DC medical malpractice attorney. Regan Zambri Long’s medical malpractice lawyers are well versed in the specific rules and regulations that govern your area, and will fight tirelessly on your behalf so that you can rest and focus on recovery.
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We have secured dozens of multimillion-dollar medical malpractice recoveries tied to diagnostic failures, including:
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These misdiagnosis results are grounded in our deep experience handling complex medical malpractice. All six of our partners are ranked among Washington, DC’s Top 30 Medical Malpractice Plaintiff Lawyers by Best Lawyers, and senior partner Patrick Regan has been named Best Lawyers’ Lawyer of the Year for Medical Malpractice Law.
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In cases that turn on careful record review and clinical judgment, clients also benefit from the perspective of partner Jacqueline Colclough, a former nurse widely regarded as Washington, DC’s leading nurse attorney.
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That experience has also earned Regan Zambri Long national recognition as a leading personal injury firm. We are consistently named as one of the Best Law Firms in America, and all six of our attorneys are currently listed among Lawdragon’s 500 Leading Plaintiff Consumer Lawyers in the United States. These distinctions reflect years of handling complex, high-stakes cases and standing up to well-resourced defendants on behalf of injured clients.
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If you need to file a medical malpractice claim regarding misdiagnosis, please contact an attorney at Regan Zambri Long today.
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Have you or your loved one sustained injuries in Washington DC, Maryland or Virginia? Regan Zambri Long PLLC has the best lawyers in the country to analyze your case and answer the questions you may have.
