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How a clinical negligence claim works

Quick answer

A clinical negligence claim usually begins with investigating what happened, obtaining the relevant records and considering independent expert evidence on breach of duty and causation. If the evidence supports a claim, the defendant is normally sent a formal Letter of Claim and has four months to provide a reasoned Letter of Response. Many disputes can be narrowed or resolved without a trial. Where they cannot, court proceedings may be started and the court then manages the evidence and issues that remain in dispute.

England and WalesLast reviewed: 25 August 2026
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Is there a set process for a clinical negligence claim?

Yes, although the precise steps and timing vary from case to case.

Claims in England and Wales are generally expected to follow the Pre-Action Protocol for the Resolution of Clinical Disputes before court proceedings are started, so far as the circumstances allow.

The Protocol is designed to help the parties exchange enough information to understand the dispute, investigate it properly, identify what is agreed and what remains disputed, and try to resolve the claim without litigation where possible.

A claim can broadly move through these stages:

  • initial fact-finding and medical records;
  • independent expert investigation;
  • possible early notification of the defendant;
  • a Letter of Claim;
  • the defendant’s investigation and Letter of Response;
  • negotiation or other dispute resolution;
  • court proceedings where the dispute remains unresolved;
  • disclosure, witness and expert evidence;
  • further settlement discussions; and
  • trial if the remaining issues cannot be resolved.

What happens at the beginning of an investigation?

The first task is usually to understand what happened and what legal questions actually need investigating.

That can involve identifying:

  • the treatment or omission being questioned;
  • the healthcare organisations and clinicians involved;
  • the important dates;
  • the injury or deterioration said to have resulted;
  • what explanation has already been given;
  • whether a complaint or patient-safety investigation has taken place;
  • whether there may be an urgent limitation issue; and
  • what records and other evidence are likely to be needed.

At this stage, it is important to separate dissatisfaction with care from the legal questions of breach of duty and causation.

When are medical records obtained?

Relevant medical records are commonly obtained early because they help establish what was recorded at the time and provide the foundation for independent expert review.

The records may come from more than one organisation. A hospital record, GP record, ambulance record and records from another specialist can each contain different parts of the chronology.

Once obtained, the records can be organised into date order and used to build a medical chronology of the events being investigated.

Why are independent medical experts needed?

Clinical negligence claims often depend on questions that require specialist medical knowledge.

The Clinical Disputes Protocol recognises that separate expert opinions may be required on:

  • breach of duty;
  • causation;
  • the claimant’s current condition and future prognosis; and
  • medical issues relevant to valuing the claim.

The expert best placed to assess whether care fell below the required standard is not necessarily the expert best placed to explain what injury the breach caused.

An investigation can therefore involve more than one medical specialty.

Can an investigation stop because the expert evidence is not supportive?

Yes.

A proper clinical negligence investigation can conclude that:

  • the care met the required standard;
  • part of the care fell below the required standard but did not cause additional injury;
  • the medical outcome would probably have been the same despite the breach;
  • the evidence cannot establish the necessary legal connection on the balance of probabilities; or
  • further evidence is needed before a reliable conclusion can be reached.

That is one reason clinical negligence claims can require substantial investigation before a formal allegation is made.

What is rehabilitation and when is it considered?

The Clinical Disputes Protocol says that both sides should consider as early as possible whether the claimant has reasonable needs that could be met by rehabilitation treatment or other measures.

Rehabilitation can concern practical or therapeutic needs arising from the injury rather than simply the eventual value of the legal claim.

The parties can discuss whether those needs can be addressed while the legal issues are still being investigated.

What is a Letter of Notification?

A Letter of Notification is an optional early step.

After records have been considered and, where appropriate, an initial supportive expert view has been obtained, the claimant may notify the defendant that a claim is likely to follow because a potential case on breach of duty and/or causation has been identified.

The purpose is to give the defendant an early opportunity to begin its own investigation.

Under the Protocol, the defendant should acknowledge a Letter of Notification within 14 days, identify who will deal with the matter and consider whether investigations should begin.

What is a Letter of Claim?

If the investigation supports pursuing the claim, the claimant sends the proposed defendant a formal Letter of Claim.

The Protocol expects the letter to give enough information for the defendant to understand and investigate the case.

It should normally address matters including:

  • the important facts and chronology;
  • the main allegations of negligence;
  • the alleged connection between those failures and the injury;
  • the claimant’s injuries and current condition;
  • prognosis where known;
  • the main financial losses or heads of damage;
  • relevant documents; and
  • the medical disciplines from which expert evidence has been obtained where applicable.

The detail required depends on the case. Complex claims will generally need more information than straightforward ones.

What happens after the Letter of Claim?

The defendant should acknowledge the Letter of Claim within 14 days and identify who is dealing with the claim.

The Protocol then normally gives the defendant four months from the Letter of Claim to investigate and provide a reasoned response.

During that period the defendant may review the medical records, obtain accounts from the clinicians involved, consider internal documents and obtain independent expert evidence.

If the defendant needs additional time, the Protocol expects any extension request to be made as soon as the need is known, with an explanation of why it is required.

What is a Letter of Response?

The defendant’s formal pre-action answer is called the Letter of Response.

It should give a reasoned position on the allegations.

Depending on the investigation, the response may:

  • admit the claim;
  • admit some allegations while denying others;
  • admit breach of duty but dispute causation;
  • dispute breach of duty;
  • dispute causation;
  • identify the expert disciplines relied upon;
  • provide a different account of disputed events;
  • provide additional relevant documents; or
  • identify another potential defendant.

Where only part of the claim is admitted, the response should make clear what is admitted and what remains disputed and why.

What happens if liability is admitted?

An admission can substantially narrow a claim, but it does not necessarily bring the entire case to an end immediately.

For example, the parties may agree that negligent care caused injury but still need evidence about:

  • the claimant’s present condition;
  • future prognosis;
  • care and treatment needs;
  • loss of earnings;
  • other financial losses; or
  • the overall amount of compensation.

A partial admission can also leave some allegations or injuries disputed.

Can a claim settle without court proceedings?

Yes.

One of the main aims of the Clinical Disputes Protocol is to resolve disputes without litigation where possible.

The parties are expected to consider negotiation and other forms of alternative dispute resolution (ADR).

These can include:

  • direct negotiation;
  • mediation;
  • early neutral evaluation;
  • appropriate offers to settle; and
  • other agreed methods of narrowing or resolving the dispute.

A settlement can address the whole claim or only part of it.

What is a Part 36 offer?

Part 36 of the Civil Procedure Rules contains a formal procedure for making offers to settle.

A Part 36 offer can be made before or after court proceedings have started and can concern the whole claim, part of the claim or a particular issue.

Part 36 has specific rules about the form of the offer and can produce important costs consequences depending on whether an offer is accepted and on the eventual outcome of the case.

What happens if the pre-action process does not resolve the dispute?

Before starting court proceedings, the Clinical Disputes Protocol expects the parties to review their positions.

This is sometimes described as a stocktake.

The parties should consider the evidence again, identify what is agreed and what remains disputed, and see whether court proceedings can still be avoided.

If proceedings cannot be avoided, they should continue to co-operate and try to identify the issues that the court will actually need to determine.

How are court proceedings started?

Where the claim remains unresolved and proceedings are required, a clinical negligence damages claim will ordinarily be started under CPR Part 7.

The proceedings begin with a claim form. The claimant’s detailed allegations are then set out in the Particulars of Claim, either with the claim form or in accordance with the procedural rules governing service.

The Particulars of Claim identify the legal case being advanced, including the alleged negligence, causation and the injury or loss claimed.

The defendant can then respond through the court process and, where the claim is defended, file a Defence dealing with the allegations.

What if limitation expires before the pre-action process is finished?

The Clinical Disputes Protocol does not extend statutory limitation periods.

If a limitation deadline requires proceedings to be started before all of the normal pre-action steps have been completed, the Protocol recognises that proceedings may need to be issued first.

The parties can then ask the court to stay the proceedings while outstanding pre-action steps are completed.

What happens after a Defence is filed?

Once a defended claim is proceeding through the court system, the court takes an active role in managing it.

The case is allocated to the appropriate procedural track and the court gives directions setting out the steps that must be completed and the timetable for doing them.

Depending on the issues and the complexity of the claim, those directions can deal with matters such as:

  • disclosure of documents;
  • witness statements;
  • expert evidence;
  • questions to experts;
  • expert discussions and joint statements;
  • financial-loss evidence;
  • case management hearings;
  • settlement or ADR;
  • costs management where applicable; and
  • preparation for trial.

What is disclosure?

Disclosure is the court process by which parties identify relevant documents that fall within their disclosure obligations.

This is wider than simply obtaining the patient’s medical records at the beginning of the claim.

Depending on the issues and the court’s directions, relevant documents can include material that supports a party’s case, adversely affects it or supports another party’s case.

What are witness statements?

Witness statements contain the factual evidence that a party intends to rely upon from a witness.

In a clinical negligence case, factual witnesses can include the claimant, family members where relevant, healthcare professionals and others with direct evidence about disputed events or the consequences of the injury.

Where a witness is called at trial, their witness statement will ordinarily stand as their evidence in chief, subject to the court’s rules and directions.

What happens to the medical experts after proceedings start?

Once proceedings are underway, expert evidence is controlled by the court under CPR Part 35.

A party requires the court’s permission to rely on an expert report or call an expert to give evidence.

The court can control:

  • which expert disciplines are reasonably required;
  • the issues on which expert evidence is needed;
  • when reports are served;
  • whether written questions may be asked;
  • whether experts should meet; and
  • what issues remain agreed or disputed between the experts.

Experts can be directed to hold discussions and produce a joint statement identifying areas of agreement and disagreement.

Can the claim still settle after proceedings have started?

Yes.

Starting proceedings does not close the door on settlement. Negotiation, mediation and formal settlement offers can continue while the case is being managed by the court.

As evidence develops, issues can also narrow. A party may change its position on liability, causation or the value of the claim.

A settlement can therefore occur before proceedings, shortly after they start, during the evidence stages or closer to trial.

What happens at a trial?

If the parties cannot resolve the issues that remain disputed, the court can determine them at trial.

The judge considers the relevant documentary evidence, factual witness evidence, expert evidence and legal arguments.

Depending on what remains disputed, the court may have to determine questions such as:

  • whether there was a breach of duty;
  • whether the breach caused injury;
  • which injuries or losses are attributable to the negligence; and
  • the amount of damages to be awarded.

The fact that proceedings were started does not mean every original allegation necessarily reaches trial. Admissions, agreements and earlier decisions can narrow the issues substantially.

How long does a clinical negligence claim take?

There is no single reliable duration for a clinical negligence claim.

The time required can depend on:

  • how quickly the relevant records can be obtained;
  • the number and availability of medical experts;
  • the complexity of breach and causation;
  • whether the claimant’s medical condition and prognosis are settled enough to assess;
  • the defendant’s position;
  • whether further treatment or rehabilitation is required;
  • the amount and complexity of financial loss;
  • whether liability is admitted;
  • whether negotiations succeed; and
  • whether court proceedings and a trial are required.

Some investigations end relatively early because the evidence does not support a claim. Others continue for much longer because the medicine, prognosis or disputed issues require further evidence.

Does every claim follow exactly the same path?

No.

The process is a framework rather than a production line.

For example:

  • an early expert opinion may show that no viable claim should be pursued;
  • a defendant may admit liability before proceedings;
  • breach may be admitted while causation remains disputed;
  • liability may be resolved while the value of the claim requires longer-term medical evidence;
  • limitation may require proceedings to be issued earlier than normal;
  • only one narrow issue may ultimately require a court decision; or
  • the parties may resolve the whole dispute through negotiation or mediation.

The purpose of the process is therefore not to force every case through every stage. It is to identify the genuine issues, obtain the evidence needed to decide them and resolve the dispute as fairly and efficiently as possible.

Don’t confuse this with

Investigation vs a claim being proved
Obtaining records and expert evidence is part of investigating whether a viable claim exists. It is not proof that negligence has already been established.
Letter of Notification vs Letter of Claim
A Letter of Notification is an optional early warning that a formal claim is likely. A Letter of Claim sets out the formal pre-action allegations once the investigation supports pursuing the claim.
Letter of Claim vs court proceedings
A Letter of Claim is a pre-action document. Court proceedings are started separately through the court process.
Letter of Response vs Defence
A Letter of Response gives the defendant’s position before proceedings. A Defence is a formal statement of case filed after proceedings have been started.
Medical records vs disclosure
Obtaining health records helps investigate the case. Disclosure is a court-governed process concerning relevant documents after proceedings are underway.
Factual witness vs expert witness
A factual witness gives evidence about events or facts within their own knowledge. An expert gives independent professional opinion evidence on matters within their expertise.
Settlement vs admission
A claim can settle without every allegation being formally admitted. The terms of the particular settlement determine what has been agreed.
Proceedings vs trial
Starting proceedings brings the claim under court management. It does not mean the claim will necessarily reach a trial.

What you can do next

  1. Identify the healthcare episode, injury and main questions that need investigating.
  2. Check limitation separately at the beginning rather than waiting until the merits investigation is complete.
  3. Obtain the relevant medical records and build a chronology of the important events.
  4. Consider whether independent expert evidence is required on breach of duty, causation and prognosis.
  5. Keep any complaint, incident investigation or relevant correspondence with the healthcare provider.
  6. If the evidence does not support breach or causation, distinguish that conclusion from dissatisfaction with the care.
  7. Where a viable claim is identified, understand the purpose of any Letter of Notification and the formal Letter of Claim.
  8. Read a Letter of Response carefully to identify what is admitted, denied or still being investigated.
  9. Consider whether negotiation, mediation or another form of ADR can resolve or narrow the dispute.
  10. If proceedings become necessary, keep limitation separate from the ordinary pre-action timetable.
  11. Once proceedings start, follow the court’s directions for documents, witnesses, experts and other evidence.
  12. Remember that settlement can remain possible throughout the process and that starting proceedings does not automatically mean a trial will follow.

Terms explained on this page

  • Pre-Action Protocol
  • Clinical Disputes Protocol
  • Medical chronology
  • Expert evidence
  • Rehabilitation
  • Letter of Notification
  • Letter of Claim
  • Letter of Response
  • Admission
  • Binding admission
  • Alternative dispute resolution
  • ADR
  • Mediation
  • Part 36 offer
  • Stocktake
  • Claim form
  • Particulars of Claim
  • Defence
  • Court proceedings
  • Stay of proceedings
  • Case management
  • Directions
  • Disclosure
  • Privilege
  • Witness statement
  • Expert report
  • Joint statement
  • Trial

Sources

This page has not yet been reviewed by a named clinical negligence specialist. It explains published procedure and does not give advice about any individual case.