When a medical group retains malpractice risk: captive, retention, or RRG?

A medical group can choose to retain part of its professional-liability risk. That choice is not just a pricing decision. It decides who funds the first dollars of defense and indemnity, who handles a severe claim, whether money stays committed for years, and what happens when physicians leave or the group sells.

Before discussing a captive or risk retention group, identify the actual current arrangement: commercial policy, deductible, self-insured retention, formal self-insurance, captive, RRG, or a combination. The label does not answer claim handling, capital, notice, defense, insolvency, or exit questions.

Four structures that are often confused

Each structure can place different parties at risk for the first layer of a claim.

A deductible is an amount that reduces or is owed under a commercial policy as that policy defines it. A self-insured retention is an amount the group may have to fund before excess insurance applies. Excess insurance may apply above a stated retention, subject to its own attachment, notice, terms, and limit. Do not assume the two structures handle defense costs, counsel, or exhaustion the same way.

A captive is an insurance company owned by the organization whose risks it insures. Its domicile is the jurisdiction that licenses and regulates it. A risk retention group (RRG) is a member-owned liability insurer. Reinsurance is insurance that an insurer buys to limit its own losses.

Structure	Who issues the relevant promise or policy	First-layer risk to verify	Path above that layer to verify
Commercial policy	Outside insurer under its policy	Deductible, exclusions, and any retained amount	Insurer's covered layer, subject to issued terms and limits
Self-insured retention	Group retention plus an outside excess policy, if any	Defined retained layer, including applicable defense expense	Excess policy after its attachment and conditions
Captive	Insurer owned by the parent or group	Risk written by the captive and its capital	Captive assets and any reinsurance under their terms
Risk retention group	Member-owned liability insurer	Risk pooled and capitalized by the RRG and members	RRG assets and any reinsurance under their terms

A captive issues policies, collects premiums, sets money aside for claims, and reports to its regulator. A feasibility study, tax memorandum, proposal, or premium invoice does not itself supply an issued policy or guarantee a claim payment.

State law and the federal Liability Risk Retention Act govern an RRG. An RRG is chartered and regulated in its domicile, and federal law permits it to operate in other states subject to the Act's registration and other requirements. It is not simply an admitted insurer in every state where a member practices.

Self-insurance does not require a captive. A group can use a retention while an outside insurer issues excess coverage. That arrangement can reveal the group's claim results and administration before it considers forming an insurance company, but it also leaves the group with a live retained-loss obligation.

Why a group retains risk

Commercial premiums reflect expected losses, claim expenses, operating costs, capital costs, taxes, and insurer pricing. A stable group may consider retaining a defined layer and buying protection above it. If losses are lower than expected, capital may remain in the program subject to its governing documents, claims, regulatory requirements, and tax consequences. If losses are higher, the group can need additional funding.

Control can matter as much as cost. A group may want consistent defense counsel, early review of incidents, and clear settlement authority. It may also want one program for related entities. A captive may propose to insure risks the commercial market excludes or prices poorly. The captive's regulator, capital, policy form, and reinsurers must support those risks; a sponsor's marketing statement does not.

Reinsurance can protect the captive or RRG above a stated amount, but the reinsurance contract determines attachment, exclusions, notice, limits, and collection rights. It is not the group's policy unless the documents say so.

These potential benefits create costs and duties. Retained claims can develop over years. Capital can remain committed while claims stay open. A group that grows, sells, or changes specialties can still owe obligations from earlier policy periods, subject to the governing documents and insurance arrangements.

No premium threshold proves that a captive will work

No universal premium threshold makes a captive suitable. A feasibility study should test:

Annual premium and the amount that the group can retain without harming operations.
Physician count, specialty mix, procedure volume, and geographic concentration.
Enough claim history to estimate how often claims occur and how much they cost.
Reliable coding, incident, and estimates for open claims.
Startup and annual legal, actuarial, audit, regulatory, tax, claim, and management costs.
Required capital and any money or property pledged to secure payment.
Available reinsurance and the amount at which it begins to pay.
Governance when owners disagree about claims or contributions.
The plan for physicians who enter, leave, retire, or sell their interests.

A group with little claim data can mistake a period without claims for predictable performance. One specialty can produce substantial premium without spreading the risk across many claims. The study should estimate losses for an expected year, an adverse year, and a severe claim that reaches reinsurance.

Licensed-insurer data omits part of the market

Direct written premium is premium received before an insurer transfers any part to a reinsurer. California's 2025 market-share workbook reports $450.3 million of medical-malpractice direct written premium from licensed insurers. The workbook covers licensed insurers only. It does not measure every surplus-lines policy, risk-retention group, captive, interindemnity arrangement, or self-insured program.

A surplus-lines insurer is not admitted in California. It may issue policies through a licensed surplus-lines broker under California rules. That status is separate from an RRG, captive, or self-insured program.

An RRG policy must carry the federally required notice that the group may not be subject to every insurance law in the insured's state. California Insurance Code section 1063.1 defines a "covered claim" for California Insurance Guarantee Association purposes and excludes risks covered by a risk retention group. Do not describe CIGA as blanket protection for an admitted insurer either; eligibility, insolvency, and statutory exclusions matter. Review the RRG's capital, estimates for open claims, reinsurance, regulator, financial statements, and oversight.

A captive's status depends on its domicile and California operations. Do not treat a captive, surplus-lines insurer, and RRG as the same structure. Identify the entity that issued the policy or program promise, its regulator, the jurisdictions where it is licensed or registered, and the actual guaranty-fund analysis.

What an employed physician needs in writing

A physician covered through a health-system captive or group program needs these terms in writing:

Which legal entity provides the coverage?
Is the agreement a policy, a promise to pay specified losses, or a self-insured program?
What are the stated per-claim, aggregate, shared-limit, deductible or retention, and defense-expense terms?
Do legal defense costs reduce those limits?
Does one limit serve the physician, group, and facility together?
Who selects counsel and controls settlement?
Which clinical activities, entities, and locations are included?
Is the arrangement occurrence, claims-made, claims-made-and-reported, or another trigger, and what definitions and notice rules apply?
What potential coverage path applies to earlier care after the physician leaves, including prior acts, retroactive date, related claims, known matters, and reporting terms?
Is an extended reporting period available, who pays, what does it cover, and what election terms apply?

The employer's size does not define these terms. The policy or program document, employment agreement, and exit agreement can address different obligations. Read them together, but do not let an employment promise create an insurer reporting right or alter a policy's terms.

What an owner group should demand

Before a group retains more risk, obtain a written feasibility report. Compare the program with commercial coverage that has comparable limits, triggers, defense structure, insureds, and exclusions. Separate the adviser from companies that earn formation or management fees. Use an independent actuary to estimate losses. Use independent insurance counsel, a claim administrator, and a reinsurance broker when the program requires them.

Define member exit terms before the program begins. Address open claims, additional member assessments or contributions, return of capital, tail or extended-reporting terms, and duties after a member leaves. A first-year projection does not show whether the program can pay claims many years later.

A small medical group should compare commercial coverage, a higher deductible, and a formal retention with the captive's capital, claim administration, regulatory work, and annual operating cost. A captive or RRG may fit a group with reliable data, enough capital, and durable oversight.

First compare commercial coverage with the amount the group would retain. Then project capital, claims, ownership, governance, reinsurance, tax, reporting, and member exits through the longest plausible claim runoff. A certificate, application, broker email, or premium invoice does not replace the issued policy, reinsurance terms, or governing documents.