In most cases, you have three years from the date of the medical negligence incident or from when you became aware of it to file a claim. However, there are exceptions to this rule. If you are filing a claim on behalf of a child who has suffered due to medical negligence, you can do so at any time before they turn 18. After they turn 18, they have until they turn 21 to file a claim. It is important to note that individuals with limited mental capacity are not subject to the time limit and can file a claim at any time.