A misdiagnosis claim typically centers on diagnostic delay or an incorrect diagnosis that leads to harmful outcomes. The “wrong diagnosis” might be documented from the start, or it might be a later realization after additional testing, a specialist consultation, or a return visit to the emergency room. Sometimes the issue is not that the provider never considered the condition, but that the provider did not order the right tests, did not follow up on abnormal results, or interpreted findings in a way that reasonable clinicians would not.
In Washington, common real-world patterns include patients who are treated for less serious problems first—such as viral illness, musculoskeletal pain, or benign lab abnormalities—only to learn later that the true condition required urgent intervention. Other situations involve imaging or laboratory results that were not properly reviewed, documented, or acted on. These cases may also include missed “red flags,” incomplete evaluation of symptoms, or failure to refer to appropriate specialists when symptoms suggested a higher-risk diagnosis.
It’s important to understand that diagnostic errors can occur in many settings. A misdiagnosis can happen in a busy urgent care clinic, during a short emergency room visit, in a primary care follow-up, or in a hospital where multiple teams share responsibility for test review. Liability may involve more than one actor, depending on how the healthcare system handled the information.


