A misdiagnosis case is a type of medical liability claim that focuses on diagnostic decision-making. It may involve a provider identifying the wrong condition, failing to rule out a dangerous diagnosis, or delaying the correct diagnosis long enough for the condition to progress. The outcome can range from unnecessary procedures and medications to delayed treatment that results in permanent impairment. In New Hampshire, these claims are often handled like other civil lawsuits involving professional negligence: the medical records tell a story, but proving the legal elements requires translating that story into a standard-of-care and causation analysis.
It is also common for diagnostic errors to unfold over multiple visits. A patient may receive reassurance during an early appointment, then return because symptoms persist or worsen. Sometimes the “wrong diagnosis” is not a single label at all, but a failure to properly interpret test results or to communicate uncertainty and next steps. That is why many misdiagnosis cases depend heavily on the timeline, including when symptoms began, what was documented, and what actions were taken in response.


