How do I know if I have a medical malpractice case?

Not every bad outcome is malpractice. A valid claim requires showing a provider deviated from the accepted standard of care and that this caused you harm. We work with medical experts to review your records.

How much does a medical malpractice lawyer cost?

We work on a contingency fee with no upfront cost and no fee unless we recover compensation for you. Clients may be responsible for case-related expenses.

How long do I have to file in New York?

New York's medical malpractice deadline is generally 2.5 years, but it can run from different dates depending on the case, and special rules apply to certain situations. Consult an attorney promptly.

Do I need a medical expert to sue?

Yes. New York generally requires a certificate of merit confirming a qualified medical expert reviewed the case and believes it has merit. We handle securing the right experts.

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Medical Malpractice

Long Island Medical Malpractice Attorney

Trial-ready representation for patients harmed by negligent medical care across Long Island and Nassau County.

Serving Nassau County & Long Island · Office in Great Neck

Free Consultation · No Fee Unless We Win Call (516) 687-9763

$40M+

Recovered for clients*

15+ yrs

Trial litigation focus

Medical Negligence

Focus area

When Medical Care Causes Harm

When a doctor, hospital, or other provider fails to meet the accepted standard of care and a patient is harmed, that’s medical malpractice. These are among the most complex injury cases — and among the most defended.

Marks Law Group represents patients and families across Long Island, Nassau County, and Great Neck. Led by trial attorney Harris Marks, we work with qualified medical experts to prove negligence and build every case for trial. Free consultation. No fee unless we win.

Cases We Handle

Medical Malpractice Cases We Handle

Claims against negligent providers and facilities, built on careful expert review.

Surgical Errors

Wrong-site surgery, retained instruments, and preventable operative mistakes.

Misdiagnosis & Delayed Diagnosis

Missed cancer, heart attacks, and conditions that worsen without timely treatment.

Birth Injuries

Preventable harm to mother or baby during pregnancy and delivery.

Medication Errors

Wrong drug, wrong dose, and dangerous interactions.

Anesthesia Errors

Dosing mistakes and monitoring failures during procedures.

Hospital & Nursing Negligence

Substandard care, neglect, and preventable infections.

How These Cases Are Proven

The Standard of Care & Expert Review

Medical malpractice isn’t just a bad outcome — it’s care that falls below what a reasonably competent provider would have done. Proving that requires qualified medical experts. New York generally requires a certificate of merit confirming an expert has reviewed the case, and we handle securing the right specialists to establish both negligence and causation.

Standard of care · Expert review · Causation

Why Marks Law Group

Complex Cases, Rigorous Preparation

These cases are demanding and the defense is well-funded. Harris Marks personally leads each case through every phase — investigation, pleadings, depositions, discovery, and trial — using a 360° litigation approach built to negotiate from a position of strength.

Over his career, Harris Marks has recovered more than $40 million for injured clients.

*Prior results do not guarantee a similar outcome.

Expert-driven — we work with qualified medical specialists to prove negligence.

Direct access — you work with the attorney handling your case.

No fee unless we win — free consultation and contingency representation.

Serving Nassau County, Great Neck & Long Island.

Common Questions

Medical Malpractice FAQ

Does a poor medical result automatically mean malpractice occurred?

No. A medical malpractice claim generally requires evidence that the provider departed from accepted medical practice and that the departure was a substantial cause of the patient’s injury. A complication or unsuccessful treatment, standing alone, does not establish those elements.

Why is the complete medical chart important?

A complete chart can establish the sequence of treatment and reveal physician orders, medication administration, laboratory results, imaging, nursing observations, consultations, consent documents, and communications between providers. Those records are often necessary for a qualified medical professional to evaluate the standard of care and causation.

How long do I have to file a medical malpractice lawsuit in New York?

The general New York limitation period is two years and six months from the alleged malpractice or from the end of continuous treatment for the same condition. Different rules may apply to a foreign object, delayed cancer diagnosis, minors, public hospitals, and other circumstances. Because the correct starting date can be disputed, the records should be reviewed promptly.

What is a certificate of merit in a medical malpractice case?

In most attorney-filed New York medical malpractice actions, the plaintiff’s attorney must provide a certificate stating that the facts were reviewed and that a knowledgeable medical professional was consulted, resulting in a reasonable basis for commencing the action. The statute includes limited exceptions and alternative procedures.

Harmed by Medical Negligence? Let’s Talk.

Get a free, confidential case review with a trial-ready attorney serving Long Island and Nassau County.

Request a Free Case Review Call (516) 687-9763