Medical Malpractice: Standard of Care, Causation, Damages, and Defenses

Summary. This article explains what the standard of care requires and how it is proved, the pre-suit expert affidavit nearly every state now demands, how causation and loss of chance work, informed consent as a separate theory, why limitations questions are unusually complex, how caps and collateral source rules reshaped recovery, who else can be liable, and the special federal regimes.

Start with the distinction that decides most of these cases before anyone reaches a courtroom: a bad outcome is not malpractice.

Medicine is practiced on sick people under uncertainty, and the law has never required a good result. It requires reasonable care. A surgeon whose patient dies of a known complication that occurs in three percent of cases, disclosed in advance and managed appropriately, has not committed malpractice. A surgeon who operates on the wrong side has.

Between those poles is where the litigation lives, and it is a narrow, expensive, expert-dependent, and heavily regulated field — most of it by state statutes enacted specifically to make these cases harder to bring.

Part I: The four elements

1. Duty. A physician-patient relationship, which creates the duty. It can arise without an in-person visit — a consulting physician who reviews a chart and gives advice may owe a duty, and a physician who gives informal advice generally does not.

2. Breach of the standard of care. The core issue. The standard is what a reasonably prudent practitioner in the same specialty would do under the same or similar circumstances. Three points matter:

It is a national standard in most states now. The old "locality rule," which measured a physician against practitioners in the same community, has been abandoned or modified nearly everywhere for specialists, though a modified locality rule survives in some jurisdictions for general practitioners.
It is set by specialty. A family physician is measured against family physicians; a neurosurgeon against neurosurgeons.
It is proved by expert testimony, without which the case fails as a matter of law in all but the narrowest circumstances.

3. Causation. Both that the breach caused the injury in fact, and that the injury was a foreseeable result. This is frequently harder than breach, because the patient was already sick — the defense in most cases is not "we did nothing wrong" but "the outcome would have been the same."

4. Damages. Actual injury. There is no claim for a breach that caused no harm. See Proving Damages in Civil Litigation.

Part II: Proving the standard of care

The expert is the case. With narrow exceptions, a plaintiff must produce a qualified expert who will testify that the defendant's care fell below the standard and that the breach caused the injury.

Qualification requirements are statutory in most states and are frequently strict: the expert must be licensed, must practice or teach in the same specialty, must have done so for a stated period, and in several states must devote a majority of professional time to clinical practice or teaching in that specialty rather than to expert testimony.

The common-knowledge exception dispenses with expert testimony where the negligence is obvious to a layperson: a surgical instrument left inside the patient, surgery on the wrong limb, a burn from equipment left on the skin. Related is res ipsa loquitur — the thing speaks for itself — which permits an inference of negligence where the injury does not ordinarily occur absent negligence, the instrumentality was in the defendant's exclusive control, and the plaintiff did not contribute.

Clinical practice guidelines are evidence of the standard, not the standard itself. A defendant may show compliance and a plaintiff may show departure, but guidelines do not conclusively establish either — patients differ, and guidelines contemplate clinical judgment.

"Two schools of thought." Where a reputable minority of practitioners follows a different approach, a physician who follows it has not breached the standard merely by choosing the less common path.

Part III: The pre-suit hurdle nobody expects

Nearly every state now requires something before a malpractice case may be filed, and missing it is the most common way a meritorious case is lost.

Certificate or affidavit of merit. A sworn statement, filed with or shortly after the complaint, from a qualified expert who has reviewed the records and concludes there is a reasonable basis for the claim. Requirements vary: some states demand the expert be identified; some permit an attorney's affidavit of consultation; some require it within a set number of days after filing.

The consequence of failure is usually dismissal, and in many states with prejudice — after the limitations period has run.

Other pre-suit requirements, depending on the state: a notice of intent to sue with a waiting period of 60 to 180 days; a pre-suit screening panel whose findings may be admissible; mandatory mediation; and a requirement to produce the medical records and authorizations before filing.

The practical instruction: the very first step in evaluating a potential claim is to determine what the state requires before suit, and how long it takes. A case brought to a lawyer three weeks before the limitations period expires may be impossible to file, not because it lacks merit but because the expert review cannot be completed.

Part IV: Causation, and the loss of a chance

Causation is where most defensible cases are won.

The traditional standard requires the plaintiff to prove that, more likely than not, the breach caused the injury. Where a patient with a 40% chance of survival received negligent care and died, the traditional rule denies recovery entirely: the patient would probably have died anyway.

The loss of chance doctrine, adopted in a substantial number of states, changes that. Where negligence reduced the patient's chance of a better outcome, the plaintiff may recover for the lost chance itself, with damages typically proportioned to the reduction — a drop from 40% to 15% producing 25% of the wrongful death damages. Other states reject the doctrine entirely, and a few permit full recovery once a substantial loss of chance is shown.

Whether the state recognizes loss of chance can decide whether the case exists, particularly in delayed cancer diagnosis cases, which are the paradigm.

The recurring causation defenses: the underlying disease caused the outcome; the patient's non-compliance or delay caused it; the injury is a known complication that occurs without negligence; and an intervening cause — a subsequent provider — broke the chain.

Part V: Informed consent

This is a separate theory with its own elements, and it survives even where the treatment itself was performed flawlessly.

The duty is to disclose the nature of the proposed treatment, its material risks, the reasonable alternatives including no treatment, and the risks of the alternatives.

Two standards divide the states. The professional standard asks what a reasonable practitioner would disclose. The patient-centered (materiality) standard — the majority modern rule — asks what a reasonable patient would consider material to the decision. The difference matters enormously: under the professional standard the plaintiff needs an expert to establish what should have been disclosed; under the materiality standard, frequently not.

Causation in informed consent asks whether a reasonable person in the patient's position, adequately informed, would have declined the treatment. Most states use that objective test rather than asking what this patient would have done, precisely because hindsight makes the subjective answer unreliable.

Exceptions to the duty: an emergency where consent cannot be obtained; risks that are commonly known; a patient's waiver; and — narrowly and increasingly disfavored — therapeutic privilege.

A signed consent form is not consent. It is evidence that a conversation occurred. Where the form is generic and the physician cannot recall the discussion, the form frequently proves less than the defense expects.

Part VI: Time limits, which are unusually complicated

Malpractice limitations rules are more restrictive and more intricate than in ordinary negligence.

The basic period is typically two to three years.

The discovery rule tolls accrual until the patient knew or reasonably should have known of the injury and its probable cause. This is essential where the injury is latent — a retained sponge, a missed diagnosis discovered years later.

The statute of repose is the trap. It is an outer limit measured from the act itself, and it runs regardless of discovery — commonly four to ten years. A patient who discovers in year nine that a surgeon left an instrument in place in year one may have a claim that never accrued in time to exist, and repose statutes have generally survived constitutional challenge.

Minors get extended periods in most states, though several cap the extension.

Fraudulent concealment tolls both limitations and, in most states, repose.

Continuous treatment tolls accrual during ongoing treatment for the same condition in a number of states.

And the notice requirements in Part III run inside these periods, not in addition to them.

Part VII: Damages, and what states have done to them

Economic damages: past and future medical expenses, life care costs, lost earnings and earning capacity, and household services. See Building a Damages Case.

Non-economic damages: pain and suffering, disfigurement, loss of enjoyment of life, and loss of consortium. This is the category most states have capped, with limits ranging from a few hundred thousand dollars to figures indexed for inflation, and with several state supreme courts having struck their caps as unconstitutional under state constitutions.

Punitive damages require conduct beyond negligence — recklessness, intentional misconduct, falsified records — and are rare.

Statutory modifications that reshape recovery:

Collateral source rule modification. The common law rule excludes evidence that the plaintiff's losses were paid by insurance. Many states have abolished or modified it in malpractice cases, permitting the jury to hear about — or the court to offset — collateral payments.
Periodic payment of future damages, rather than a lump sum, with payments terminating on death in some statutes.
Attorney fee limits, capping contingent fees on a sliding scale.
Joint and several liability reform, limiting a defendant's exposure to its proportionate share.

The practical consequence of all of this is that a case with modest economic damages and severe non-economic harm — a death of a retired person, an injury to a child with no earnings history — may not be economically viable in a capped state, because the cost of experts exceeds the recoverable amount. That is not an accident of the statutes; it is their design.

Part VIII: Who else can be liable

Vicarious liability makes an employer responsible for an employee's negligence within the scope of employment. The complication is that hospitals frequently contract with physicians as independent contractors, particularly emergency physicians, radiologists, anesthesiologists, and pathologists — which defeats respondeat superior.

Apparent agency (ostensible agency) answers that. Where the hospital held the physician out as its agent and the patient reasonably relied on that appearance, the hospital may be liable notwithstanding the contract. The evidence is the signage, the badges, the billing, and whether the patient chose the physician or simply arrived at the hospital.

Corporate negligence is a direct claim against the institution for its own failures: negligent credentialing and privileging, failure to supervise, inadequate staffing, defective equipment, and failure to have and enforce adequate policies.

Negligent credentialing deserves separate mention because it intersects with peer review protection. The Health Care Quality Improvement Act, 42 U.S.C. § 11101 et seq., was enacted to encourage effective peer review by granting participants immunity from damages for professional review actions meeting statutory standards, at 42 U.S.C. § 11111, and by creating the National Practitioner Data Bank, to which malpractice payments and adverse actions must be reported and which hospitals must query when granting privileges.

State peer review privileges shield the deliberations of quality committees from discovery, and they are the single most contested discovery issue in hospital malpractice litigation: the plaintiff wants the credentialing file, and the hospital asserts privilege over most of it. The boundary — original source documents are generally discoverable even if reviewed by a committee — is where these fights are resolved.

Part IX: Special regimes

EMTALA. The Emergency Medical Treatment and Labor Act, 42 U.S.C. § 1395dd, requires Medicare-participating hospitals with an emergency department to provide an appropriate medical screening examination to anyone who comes seeking treatment, and to stabilize an emergency medical condition before transfer or discharge. It is not a malpractice statute — it does not create a federal negligence claim — but it creates a private right of action for failure to screen or stabilize, with no expert affidavit requirement in most jurisdictions and a two-year period. It reaches disparate treatment and dumping, not misdiagnosis.

Federally supported health centers. Community health centers and free clinics deemed under 42 U.S.C. § 233 are treated as Public Health Service employees, which means a malpractice claim against them proceeds against the United States under the Federal Tort Claims Act — with an administrative claim required first under 28 U.S.C. § 2675, jurisdiction under 28 U.S.C. § 1346(b), a two-year presentment deadline, no jury, and no punitive damages. Suing the clinic in state court instead is a jurisdictional error that frequently cannot be cured, and the deemed status is not obvious from the clinic's name.

Military and VA care likewise proceeds under the FTCA, subject to the Feres doctrine for active-duty service members.

Vaccine injury. The National Vaccine Injury Compensation Program requires a petition to the Court of Federal Claims under 42 U.S.C. § 300aa-11 before any civil action for a covered vaccine, with a no-fault Vaccine Injury Table and fees paid regardless of outcome for a good-faith petition.

Medical records access. HIPAA, through 42 U.S.C. § 1320d-2 and its implementing rules, gives patients a right of access to their own records, with limits on the fees that may be charged — a right frequently obstructed by facilities quoting per-page charges that exceed what the rule permits.

Part X: The case categories, and where each turns

Malpractice claims cluster, and each cluster has a characteristic weak point.

Diagnostic error is the largest category and the hardest. The question is rarely whether the diagnosis was wrong; it is whether the differential was adequate, whether the indicated test was ordered, and whether the abnormal result was acted on. The recurring failure is a result that was resulted and never seen — a critical value called to a covering physician, a radiology report with an incidental finding that nobody followed up. The proof is in the timestamps: when the study was performed, when it was read, when it was communicated, when it was acknowledged.

Delayed cancer diagnosis is the paradigm loss-of-chance case, and it lives or dies on staging. The plaintiff must show what stage the disease was at the time of the negligence and what the survival probability was at that stage, versus the stage at actual diagnosis. That requires an oncologist and frequently a pathologist, and it is why these cases are expensive.

Surgical error. Wrong site, retained foreign body, and nerve injury. The first two are near-strict-liability in practice — universal protocol requires site marking and a timeout, and a count discrepancy requires imaging before closure. Nerve injuries are much harder, because many are recognized complications.

Medication error. Wrong drug, wrong dose, known allergy, dangerous interaction, failure to monitor a drug requiring levels. The medication administration record is the document, and the chain — prescriber, pharmacy, nurse — determines who is liable.

Obstetric injury. The highest-value and most heavily defended category. The fights are over fetal monitoring strip interpretation, the decision-to-incision interval, and the causation question of whether the injury was intrapartum or antenatal — where cord blood gases and placental pathology frequently decide the case.

Emergency department. Triage, screening adequacy, discharge with an unresolved abnormal vital sign, and failure to admit. Consider EMTALA alongside negligence where the issue is screening or transfer rather than clinical judgment.

Nursing home and long-term care. Pressure injuries, falls, dehydration, elopement, and medication errors. These are frequently understaffing cases, and the records that matter are the staffing sheets, the acuity assessments, and the state survey history rather than the physician orders. See Elder Law and Long-Term Care.

Anesthesia. Airway management, monitoring, and positioning injuries. Comparatively rare and comparatively clear when they occur.

Hospital-acquired infection. Difficult, because infection occurs without negligence; the viable cases involve a documented breach of a specific protocol.

Part XI: How these cases are actually worked up

Get every record, from every source. Not a summary and not the discharge summary — the complete chart: physician orders, progress notes, nursing notes, the medication administration record, flow sheets, vital sign records, laboratory and imaging results with the actual images on disc, consent forms, telemetry and fetal monitoring strips, the emergency department record, consultation reports, operative and anesthesia records, and the audit trail of the electronic record.

The audit trail is the most underused document in the field. Modern electronic records log who accessed the chart, when, what they viewed, what they entered, and — critically — what was altered after the fact and when. A note "written" three days after the event, or amended after a bad outcome, is visible only in the audit log, and it must be requested specifically because it is never produced with the chart.

Build a minute-by-minute timeline for the critical period, drawn from the objective sources — the monitor strip, the laboratory timestamps, the medication administration times, the nursing entries — rather than from the narrative notes.

Then get the merit review. A qualified specialist reviews the complete records and answers two questions separately: was there a departure from the standard, and did it cause the injury. Many reviews find a departure and no causation, which is why a screening review costs a few thousand dollars and litigation costs six figures.

Then check the economics before proceeding, honestly: the recoverable damages under the state's caps and collateral source rules, against the cost of the experts required. In a capped state a case with severe non-economic harm and no lost earnings frequently cannot be brought, and that arithmetic belongs at the beginning of the engagement rather than the middle.

Part XII: The defense side

Defending these cases is a distinct practice with its own sequence, and much of it happens before a claim exists.

On notice of an adverse event: preserve everything and issue a hold, including the electronic audit trail; sequester and preserve equipment and any retained device or specimen; identify everyone involved; and — critically — do not alter the record. A late entry properly dated and identified as an addendum is fine. A note back-dated or a chart altered after the fact converts a defensible negligence case into a spoliation and credibility case, and it is visible in the audit log.

Peer review and quality review should be conducted through the channel that preserves the state privilege, and counsel should structure it. The line is that original source documents remain discoverable even when reviewed by a committee; the committee's deliberations may not be.

Apology and disclosure. Most states now have an apology statute making expressions of sympathy inadmissible, though many exclude admissions of fault from that protection. A growing number of institutions operate communication-and-resolution programs — prompt disclosure, investigation, explanation, and where appropriate an offer — and the evidence is that they reduce both claims and total cost while producing better outcomes for patients. That is not a soft consideration; it is the single most effective claims-management intervention documented.

The affirmative defenses worth developing early: compliance with the standard of care, supported by the guidelines and the records; causation — the outcome would have been the same, or the underlying disease caused it; comparative fault where the patient's non-compliance or delay contributed; the known complication defense; the two schools of thought doctrine; and every procedural defense in Part III and Part VI — the missing affidavit, the defective notice, the limitations period, and above all the statute of repose.

And the practical judgment. Malpractice defense is largely about identifying, early, which cases should be tried and which should be resolved. A case with a sympathetic plaintiff, a documented departure, and a clean causation chain does not improve with time, and the National Practitioner Data Bank reporting obligation attached to any payment made on behalf of a practitioner means that decision has consequences beyond the file.

Part XIII: Three cases, and why each came out as it did

The missed fracture that was not malpractice. A patient presents to an emergency department with wrist pain after a fall. The X-ray is read as normal. Six weeks later a scaphoid fracture is diagnosed, and the patient develops avascular necrosis.

Why it fails. Scaphoid fractures are famously occult on initial films — the standard of care contemplates that they are frequently invisible for one to two weeks. The question is not whether the fracture was missed; it is whether the physician did what the standard requires given that known limitation: examined for snuffbox tenderness, immobilized empirically, and arranged follow-up imaging. If the chart shows those three things, there is no breach even though the outcome is bad. If it shows a normal film and a discharge with no immobilization and no follow-up instruction, there is.

The delayed diagnosis that turned on staging. A woman reports a breast lump. It is attributed to fibrocystic change and no imaging is ordered. Fourteen months later she is diagnosed with node-positive disease.

Where the case lives. Breach is straightforward. Causation is the case, and it is an expert reconstruction: what was the tumor's size and stage fourteen months earlier, based on doubling-time modeling and the pathology; what was the survival probability at that stage versus at diagnosis; and does this state recognize loss of chance? In a loss-of-chance state, a reduction from 87% to 62% supports proportional damages. In a state that rejects the doctrine and applies the traditional more-likely-than-not rule, the same facts may support no recovery at all, because she would probably have survived either way — which is a result many people find difficult to accept and which is what the doctrine exists to address.

The clinic that was actually the United States. A patient injured by care at a community health center retains counsel, who files in state court eleven months later. The defendant moves to dismiss: the clinic is federally deemed under 42 U.S.C. § 233, the exclusive remedy is against the United States under the Federal Tort Claims Act, and an administrative claim was required first under 28 U.S.C. § 2675.

The consequence. The state case is dismissed. The two-year presentment deadline has been running the whole time. Whether the claim survives depends on how much of it is left and whether any equitable doctrine applies — and the answer is frequently that it does not. Nothing about the clinic's name or signage disclosed its deemed status, and the check that would have caught it — searching the federal database of deemed entities — takes two minutes and is not part of most intake routines.

The common thread. None of the three turned on whether the care was good. They turned on what the standard actually required given known limitations, on which causation doctrine the state applies, and on which sovereign the defendant belonged to.

Part XIII-A: The remedies that are not lawsuits

Most people who believe they were harmed by medical care do not want money first. They want an explanation, an acknowledgment, and assurance that it will not happen to someone else. Litigation is a poor instrument for all three, and better ones exist.

Ask the institution directly. Every hospital has a patient advocate or patient relations office, and most will arrange a meeting with the treating team. A request for a written explanation of what happened is frequently granted, and it costs nothing.

Communication-and-resolution programs. A growing number of health systems operate formal programs: prompt disclosure of an adverse event, an investigation, a full explanation, an apology where warranted, and — where the care was substandard — an offer of compensation without litigation. The evidence is that these programs reduce claims, reduce total cost, and produce better outcomes for patients than the adversarial process. Ask whether the institution has one.

The state medical board. A complaint triggers an investigation of the practitioner's competence and conduct. It does not produce compensation, and it is not a substitute for a claim — but it is free, requires no lawyer, and it is the mechanism that addresses a pattern. Boards can require education, impose practice restrictions, and suspend or revoke a license.

The hospital's accreditation body, which investigates complaints about patient safety and can require corrective action.

The state health department, which surveys and licenses facilities and investigates complaints — particularly effective for nursing homes, where survey findings are public and become evidence.

The long-term care ombudsman, free and independent, for anything involving a facility resident.

A billing dispute, which is separate from the care dispute. Where the harm was compounded by charges for the corrective treatment, a hospital will frequently write them off on request, especially where the account is discussed with risk management rather than with billing.

And a caution about sequencing. Some of these routes generate records that will be discoverable in later litigation, and some involve statements by the patient that will be used. If a claim is a realistic possibility, talk to a lawyer before pursuing the non-litigation routes — not because they should be avoided, but because the order matters.

Part XIII-B: What the reform statutes were meant to do, and what they did

Every element of this article that makes malpractice cases hard to bring was enacted deliberately, and it is worth understanding the argument on both sides, because it explains the shape of the field.

The case for the reforms. Malpractice premiums rose sharply in several periods, specialists in high-risk fields left particular states, and the claim was that meritless litigation was driving both. Defensive medicine — tests and procedures ordered to protect against suit rather than to help the patient — was said to add substantially to health care costs. Caps on non-economic damages, certificates of merit, expert qualification statutes, statutes of repose, and collateral source modifications were the response, adopted in waves from the 1970s onward.

What the evidence shows. The picture is mixed and genuinely contested. Damages caps do appear to reduce average payments and premium growth. The evidence that they improve physician supply is weaker and concentrated in particular specialties and rural areas. The evidence that they meaningfully reduce defensive medicine is weakest of all — defensive practice appears to be driven substantially by professional norms and by the culture of the specialty rather than by measured legal risk.

What is not seriously contested is the distributional effect. A cap on non-economic damages has no effect on a case with large lost earnings and every effect on a case without them. The people whose recoveries are limited are therefore disproportionately children, retirees, homemakers, and the disabled — precisely the people whose losses are least captured by an earnings calculation. Combined with the cost of experts, the practical result in several states is that only cases with substantial economic damages can be brought at all.

And the other half of the picture. Studies of hospital records consistently find that the number of patients injured by negligent care substantially exceeds the number of claims filed — by a large multiple. The system as it exists compensates a small fraction of the people it was designed for, slowly, at high transaction cost, while imposing real burdens on practitioners who are frequently not negligent. Both criticisms are true simultaneously, which is why proposals for administrative compensation systems, health courts, and safe-harbor rules tied to guideline compliance keep recurring.

Why this matters to a reader with a case. It explains why the answer to "was this malpractice?" so often turns out to be a question about a statute rather than about medicine — and why a lawyer who declines a case with a genuinely bad outcome is usually describing the arithmetic the legislature created rather than the quality of the care.

Part XIV: Frequently asked questions

How do I know if it was malpractice? You do not, until a qualified physician in the same specialty reviews the complete records. A bad outcome is not malpractice, and most bad outcomes are not.

How long do I have? Two to three years in most states, subject to the discovery rule — but also subject to a statute of repose that can bar a claim before it is discovered. Ask immediately.

What does it cost? Nothing up front. These cases are taken on contingency, and the firm advances expert and litigation costs, which routinely reach six figures.

Why did three lawyers decline my case? Usually causation or economics — either the outcome would probably have been the same, or the recoverable damages will not cover the cost of proving it in a capped state.

Can I sue for a bad result alone? No. You must show a departure from the standard of care that caused the injury.

What about the consent form I signed? It is evidence, not a defense. Informed consent requires an actual disclosure of material risks and alternatives.

Can I get my records? Yes. HIPAA gives you a right of access, and fee limits apply. Request them in writing.

Part XV: For patients and families — what to do

Request the complete records immediately, in writing — from every provider and facility, including imaging on disc, and the nursing notes and the medication administration record, which are frequently the most informative documents and are frequently omitted.
Write down the chronology while you remember it: dates, times, who said what, what you asked, what you were told.
Do not sign anything the hospital's risk management department presents, and do not accept a settlement before a lawyer reviews the records.
Do not post about it. Social media is discoverable and is routinely used.
Keep treating, and keep every bill and every explanation of benefits.
Ask a lawyer early — the pre-suit affidavit requirement and the notice periods take months, and the repose statute does not wait.
Ask whether the provider is a federally deemed clinic, because that changes the court, the deadline, and the procedure entirely.
If it was an emergency department refusal or a transfer, ask about EMTALA, which is a separate claim with different requirements.
Understand the economics. In a capped state, a case with severe harm and no lost earnings may not be viable, and a lawyer who declines is usually telling you something about the statute rather than about your care.
If your goal is an explanation rather than money, say so — a state medical board complaint, a hospital patient advocate, and in a growing number of institutions a communication-and-resolution program exist for exactly that, and none requires litigation.

Primary authority

42 U.S.C. § 11101 and § 11111 — the Health Care Quality Improvement Act: peer review immunity and the National Practitioner Data Bank.
42 U.S.C. § 1395dd — EMTALA: screening, stabilization, and transfer.
42 U.S.C. § 233 — Public Health Service coverage for deemed health centers.
28 U.S.C. § 1346(b) and 28 U.S.C. § 2675 — Federal Tort Claims Act jurisdiction and the administrative claim prerequisite.
42 U.S.C. § 300aa-11 — vaccine injury petitions.
42 U.S.C. § 1320d-2 — HIPAA standards, including the right of access to records.
State medical malpractice acts: certificate and affidavit of merit requirements, notice of intent statutes, pre-suit panels, expert qualification statutes, damages caps, collateral source modifications, periodic payment provisions, attorney fee limits, statutes of repose, and peer review privileges.