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Directory · New Jersey · Medical malpractice

Who writes medical malpractice in New Jersey

Top insurer groups from the NAIC market share report; the state's list carries no lines of authority.

Berkshire Hathaway Group wrote the most medical malpractice in New Jersey in 2025, $201.2M and 33.3% of the state's premium; the top five groups hold 60%. New Jersey's company list doesn't say which lines each company is licensed for, so the ranking below is the NAIC's top 10 groups; every licensed company is on the New Jersey page.

By Sam Alishahi, independent insurance broker · All lines in New Jersey

Top 10 · NAIC table: 11.1, 11.2 - Medical Professional Liability

The insurer groups that write the most medical malpractice in New Jersey

Top 10 insurer groups by direct premium written in 2025, from the NAIC's Market Share Reports for Property/Casualty Groups and Companies by State. A group is the parent and its insurance companies together; share is the group's part of the state total for the line; loss ratio is losses incurred over premium earned.

#Insurer groupPremium writtenShareLoss ratioMember companies here
1Berkshire Hathaway Group$201.2M33.33%61%GEICO General Insurance Company, GEICO Texas County Mutual Insurance Company, GEICO County Mutual Insurance Company, Government Employees Insurance Company
2Mag Mutual Insurance Group$60.3M9.99%—MAG Mutual Insurance Company, Professional Security Insurance Company, MD Advantage Insurance Company of New Jersey
3Coverys Group$36.0M5.96%285%Preferred Professional Insurance Company, ProSelect Insurance Company, Coverys Specialty Insurance Company, Coverys Risk Retention Group, Inc.
4Curi Holdings Group$34.3M5.69%99%Medical Mutual Insurance Company of North Carolina, MMIC Insurance, Inc., Medical Security Insurance Company, UMIA Insurance, Inc.
5Cna Insurance Group$32.1M5.32%5%Continental Casualty Company, Continental Insurance Company, (The), American Casualty Company of Reading, Pennsylvania, National Fire Insurance Company of Hartford
6Conventus Inter-Insurance Exchange$25.8M4.27%51%—
7Doctors Co. Group$23.5M3.89%42%Doctors' Company (The), An Interinsurance Exchange, The Doctor's Management, TDC Specialty Insurance Company, TDC National Assurance Company, Doctors Company Risk Retention Group, A Reciprocal Exchange, The
8Chubb Ltd Group$22.5M3.73%141%Federal Insurance Company, Ace American Insurance Company, Ace Property and Casualty Insurance Company, Chubb Lloyd's Insurance Company of Texas
9Liberty Mutual Group$19.8M3.29%21%Safeco Insurance Company of America, Liberty Insurance Underwriters, Inc., Liberty Mutual Fire Insurance Company, Liberty County Mutual Insurance Company
10Proassurance Corporation Group$16.4M2.72%88%NORCAL Insurance Company, ProAssurance Indemnity Company, Inc., ProAssurance Insurance Company of America, Allied Eastern Indemnity Company
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Last resort for medical malpractice in New Jersey

Last resortLinesWhereHow to get in
Surplus lines and Lloyd's open marketallall states, under each state's diligent-search rulesThrough surplus lines wholesalers; commercial property and liability have no guaranteed plan, so this is their last stepSource

Method and source

Source: the New Jersey insurance regulator company list, read 2026-10-18 and the surplus lines list. Admitted list 'Licensed Insurance Carriers' (Last-Modified: Sat, 17 Oct 2026 15:16:06 GMT) covers every licensed carrier of every kind (P&C, life, health, title, fraternal, HMO...). It gives name, address, phone, NAIC number only: no company type, no lines, no domicile, no license date, so everything is kept and type/lines/domicile/since are empty; filter P&C by NAIC code against another source. Extra fields addr_state/address/phone are the mailing address on the list, not the state of domicile. 25 rows show 'NAIC No. 0' on the list (managed-care / medical-review vendors and purchasing alliances, not insurers) and are kept with naic=''. 6 exact repeats (same NAIC + name, second address) were collapsed to one row. White list prints the same NAIC code for more than one company (kept as printed, verify before matching): 13064 = Tudor Insurance Co. / United National Insurance Co.. Surplus Lines White List dated 2026-09-16: 219 foreign/domestic eligible insurers with 5-digit NAIC codes (domicile NJ set only for the domestic section; foreign rows have no domicile on the list) and 95 alien insurers carried with naic='' and their NAIC IID/AIN number in the extra 'ain' field. 'eligible' is filled only where a footnote gives an approval effective date (this release's additions); other rows have no date on the list. Footnote markers like (A-3)/(NC-3) are stripped from names. "Premium" is direct premium written in the state for the year shown; "share" is that company's part of the state total for the line. A company can be licensed for a line and write none of it, and a surplus lines insurer can write a line without a state license for it.

Open to use. Cite "Alishahi Insurance insurance company directory" and link here. CSV · JSON.

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