What You Must Prove in a Medical Malpractice Claim

A medical malpractice claim requires proof that a doctor or other provider fell below the standard of care. You must also prove this failure caused you real harm. A bad result on its own is not malpractice. Most states also add extra steps, such as an expert's sign-off, shorter filing deadlines and caps on some damages.

What are the four elements of a malpractice claim?

Malpractice is a type of negligence, so you must prove the same core elements that Cornell's Legal Information Institute lists for any negligence case. Lawyers usually group them into four.

1. Duty. A provider-patient relationship existed. This is rarely disputed if the provider treated you.
2. Breach. The provider did something a reasonably careful provider in the same field would not have done. Failing to act can also be a breach.
3. Causation. The breach, not your underlying illness, caused the injury. This is often the hardest element in a failure-to-diagnose case.
4. Damages. You suffered losses the law recognizes, such as extra medical bills, lost income or pain and suffering.

Missing any one element ends the claim. A surgeon who plainly erred but caused no lasting harm may leave you with no case worth bringing.

What is the standard of care, and why do you need an expert?

The standard of care is what a reasonably careful provider in the same specialty would have done in the same situation. Jurors cannot judge that on their own, so in nearly every case a qualified medical expert must testify about it.

Some states force the issue early. In Texas, Civil Practice and Remedies Code §74.351 requires an expert report for each doctor or provider you sue. It is due 120 days after that defendant files its answer. If you miss that deadline, the court must dismiss the claim with prejudice and order you to pay the defendant's attorney fees.

A court that finds a report deficient may allow one 30-day extension to fix it. That is the only cushion the statute gives.

What is a certificate or affidavit of merit?

A certificate or affidavit of merit shows that a qualified professional reviewed your case and found a reasonable basis for it. Many states require one, and they differ on timing and on who signs.

• Pennsylvania. Under Rule 1042.3, your lawyer must file a certificate with the complaint or within 60 days after filing. It must state that a licensed professional gave a written statement that the care likely fell outside acceptable standards. A court can extend the deadline by up to 60 days for good cause.
• New York. CPLR 3012-a requires the attorney to certify that they consulted at least one physician and concluded there is a reasonable basis for the suit. If the filing deadline left no time, the certificate is due within 90 days after service of the complaint.
• Georgia. O.C.G.A. §9-11-9.1 requires an expert's affidavit filed with the complaint. It must name at least one negligent act or omission and the facts behind it. If the deadline is about to run, you may get 45 days after filing to add the affidavit.

Missing these filings can get a case dismissed. That is why lawyers usually want an expert review done before they file.

How long do you have to file a malpractice lawsuit?

Malpractice deadlines are usually shorter and stricter than the general personal injury statute of limitations. Many states also have a statute of repose, an outer limit that runs from the treatment date even if you never discovered the harm.

• California. Code of Civil Procedure §340.5 allows 3 years from the injury or 1 year from when you discovered it, whichever is first. The 1-year clock can start when you reasonably should have found it. The 3-year limit stretches only for fraud, intentional concealment or a foreign object left in the body.
• Texas. §74.251 sets 2 years from the breach or the end of the related treatment. No claim may be brought more than 10 years after the act, whatever the circumstances.
• New York. CPLR 214-a allows 2 years and 6 months. A foreign-object claim gets 1 year from discovery. For a missed cancer diagnosis, the clock starts at discovery, with a 7-year outer limit.

Children get different rules. In California, a child under 6 has 3 years or until their 8th birthday, whichever is longer. In Texas, a child under 12 has until their 14th birthday.

Are malpractice damages capped?

In many states, yes, but usually only non-economic damages such as pain and suffering. The California and Texas caps below do not limit medical bills or lost earnings.

California. The MICRA cap was $250,000 for decades. AB 35 replaced it starting in 2023 with $350,000 for injury cases and $500,000 for death cases. Under Civil Code §3333.2, those amounts rise each January 1 by $40,000 and $50,000 until they reach $750,000 and $1 million.

That puts the 2026 caps at $470,000 for injury and $650,000 for death. The cap in effect at the time of judgment, arbitration award or settlement is the one that applies. Separate caps can apply to providers, to institutions such as hospitals, and to unaffiliated defendants, so one case may involve more than one cap.

Texas. §74.301 limits non-economic damages to $250,000 per claimant against all physicians and providers combined. Each health care institution faces its own $250,000 cap, with $500,000 as the total for all institutions.

Caps also affect which cases lawyers accept, since a capped award must still cover expert costs. Our California and Texas pages cover other state rules.

How are lawyers paid in malpractice cases?

Malpractice lawyers usually work on contingency, and some states cap their percentage. California Business and Professions Code §6146 limits the fee to 25% for a settlement before a lawsuit or arbitration demand is filed. After filing, the limit is 33%. A court can approve more for good cause. Our contingency fee guide covers other states' limits.

What should you do next?

1. Request your complete records now. Ask every provider involved, including imaging and pharmacy records.
2. Write a timeline. List each visit, symptom, test and the date you first suspected a problem. The discovery date can decide whether your claim survives.
3. Count backward from the shortest deadline. A lawyer needs time for expert review before filing, so a claim near the deadline may be turned down.
4. Ask a lawyer these questions. Which expert specialty will review my case? Which deadline applies to me? Does a damages cap change what my case is worth? Who pays expert costs if we lose?

If you contact firms from our city rankings, ask each one how many malpractice cases it has handled in the last few years.