Malpractice insurance is a type of liability insurance, not a separate category of coverage. It sits inside the broader liability family under the formal name “professional liability,” while the policy most people think of as plain “liability insurance” is actually commercial general liability. The two protect against different kinds of claims, exclude each other’s territory on purpose, and most professionals need both.
How the Two Fit Together
Liability insurance is the umbrella. Malpractice is one product under it. Both pay for your legal defense and for damages when someone sues you, but they respond to different triggering events.
General liability answers for physical harm: a client gets hurt on your premises, your crew damages someone’s property on a job, a competitor claims your advertising defamed them. Professional liability answers for financial harm caused by your professional work: bad advice, a missed diagnosis, a drafting error, a design flaw.
The reason the distinction matters in practice is that each policy explicitly excludes the other’s territory. A standard commercial general liability policy is typically endorsed to exclude claims arising from professional services.1Insurance Information Institute. Commercial General Liability Insurance If a consultant is sued for advice that cost a client money, the general liability insurer will point to that exclusion and walk away. The reverse is just as true: if a visitor trips over a cable in a consultant’s office and breaks a wrist, the professional liability policy won’t touch it. Each policy is written to fill the gap the other leaves open.
What General Liability Covers
A commercial general liability (CGL) policy is the baseline coverage most businesses carry. It responds to three broad categories of claims: bodily injury to third parties, damage to someone else’s property, and personal or advertising injury such as libel, slander, or copyright infringement.1Insurance Information Institute. Commercial General Liability Insurance The common thread is that the loss comes out of your business operations or premises, not out of professional judgment.
A customer slipping on a wet floor is the textbook case. CGL also responds when your employees damage a client’s property on the job. A painting contractor who leaves water running and floods a customer’s home is a general liability claim.1Insurance Information Institute. Commercial General Liability Insurance Advertising-related claims fall here too, so a slander accusation out of a marketing campaign is defended by CGL.
Landlords and clients commonly require it. Most commercial leases won’t let you move in without CGL, and many client contracts won’t start without proof of it. For small businesses, average annual premiums tend to run under $1,000.
What Malpractice (Professional Liability) Covers
Professional liability insurance, also called errors and omissions (E&O) coverage or, in medicine, malpractice insurance, protects against claims that your professional services caused a client financial harm. It covers allegations of negligence, errors, omissions, misrepresentation, and violation of good faith and fair dealing in professional work.2Insurance Information Institute. Professional Liability Insurance These are the claims general liability refuses to touch.
The word “malpractice” is most associated with healthcare. Every practicing physician needs medical malpractice insurance to protect against lawsuits alleging treatment errors, misdiagnosis, or surgical complications.3American Medical Association. Medical Liability Insurance – What Final-Year Residents Should Know Premiums vary dramatically by specialty and location. Most doctors pay between $7,500 and $20,000 a year, but neurosurgeons and OB-GYNs in high-litigation areas can face premiums above $100,000. About seven states require physicians to carry it by law; elsewhere, hospitals and credentialing bodies effectively require it anyway.
Outside healthcare, the same concept carries the E&O label. An accountant whose filing error triggers IRS penalties, a financial advisor whose recommendation causes investment losses, an architect whose design flaw forces costly rework — all E&O claims. Lawyers, engineers, insurance agents, real estate brokers, and IT consultants are among the many professionals who carry it. The policy pays defense costs and any settlement or judgment up to the policy limit.2Insurance Information Institute. Professional Liability Insurance
Do You Need Both?
For most professionals, yes. General liability protects your premises and operations. Professional liability protects your professional work. One does not substitute for the other, and carrying only one leaves a predictable gap.
If your work is purely physical — a retail store, a cleaning service, a landscaping crew — general liability may be enough on its own, because the business doesn’t involve the kind of advice, judgment, or specialized expertise that generates an E&O claim. The moment your services involve diagnosis, recommendations, design, or professional advice, malpractice coverage becomes necessary.
Client contracts increasingly set the floor. Many require minimum professional liability limits, with $1 million per claim a common baseline, and many want a certificate of insurance before work starts.
Two Policy Mechanics That Trip People Up
Treating malpractice as “just liability insurance” leads buyers to miss two features that work differently under a professional liability policy than they do under general liability.
Claims-Made vs. Occurrence
Almost all professional liability and malpractice policies are written on a claims-made basis.2Insurance Information Institute. Professional Liability Insurance General liability policies are usually occurrence-based.
An occurrence policy covers any incident that happens during the policy period, regardless of when the claim is filed. A CGL policy in force in 2024 responds to a lawsuit filed in 2026 over a 2024 injury.
A claims-made policy only covers claims actually filed while the policy is active, and only for incidents on or after the policy’s retroactive date, which is the point from which your continuous coverage began.4PubMed Central. Malpractice Insurance – What You Need to Know If your policy lapses, your ability to report claims for past work can lapse with it. That is why professionals leaving a claims-made policy typically buy an extended reporting endorsement, known as tail coverage, to keep the reporting window open.5American Bar Association. FAQs on Extended Reporting (Tail) Coverage
Defense Costs Inside or Outside the Limit
Liability policies state limits as two numbers: per-claim and aggregate. A “$1 million / $3 million” policy pays up to $1 million for a single claim and $3 million across all claims in the policy period. What varies between policy types is whether defense costs come out of that limit.
- Defense outside limits: your insurer pays legal defense separately from the policy limit. A $1 million policy still has $1 million available for settlement or judgment even after $200,000 in defense costs.
- Defense inside limits, often called eroding limits: defense costs reduce the policy limit. That same $200,000 in defense knocks the available coverage down to $800,000.
Most professional liability policies use defense-inside-limits. Most general liability policies treat defense as supplementary and pay it outside the limit.2Insurance Information Institute. Professional Liability Insurance A $1 million malpractice policy with eroding limits provides meaningfully less protection than the number suggests, so defense costs need to factor into the limit you choose.
What Neither Policy Will Cover
Even with both policies in place, several categories sit outside liability coverage entirely. Intentional misconduct is the universal exclusion: deliberate harm, fraud, and criminal conduct are not covered by any liability policy. Beyond that, professional liability policies generally exclude employment disputes such as discrimination, harassment, or wrongful termination, which require separate employment practices liability coverage. Workers’ compensation claims from employees are handled by workers’ comp, not by general or professional liability. Contractual guarantees of a specific outcome, rather than a promise of competent professional effort, may fall outside coverage. Regulatory fines from licensing boards and government agencies are typically excluded, though some policies pay limited defense costs for board proceedings. Pollution claims and auto accidents are standard exclusions from general liability and need their own policies.
Reading the exclusions before buying is worth the time. Finding a gap after a claim is filed is the worst moment to learn what your coverage leaves out.