What Does a TPA Do for a Self-Funded Health Plan? Roles, Responsibilities, and Gaps

What does a TPA do? A third-party administrator runs the daily operations of a self-funded health plan on the employer’s behalf. It processes claims, tracks who is eligible, answers members and providers, and reports results to the plan sponsor. However, it does not insure anyone. The employer funds the claims and keeps the legal responsibility for the plan.

That split confuses almost everyone at first. The TPA’s logo is on the ID card, and the employer’s money is in the account. This guide sets out the roles and responsibilities a TPA takes on and the ones it cannot take. It also covers the gaps between them. It is an operational explainer, not legal advice.

What Does a TPA Do? The Short Answer

In a self-funded health plan, the employer pays medical claims from its own funds. It does not buy an insurance policy. That model now dominates. According to KFF’s 2025 Employer Health Benefits Survey, 67 percent of covered workers are in self-funded plans. The share reaches 80 percent at larger firms and 27 percent at firms with 10 to 199 workers. Few of those employers want to build a claims department, so they hire an administrator.

State insurance law gives the role a formal shape. Under the NAIC model act, a TPA “adjusts or settles claims” and collects charges or premiums for a payor. The model also requires a license and a written agreement with that payor. Actual rules vary by state, because the NAIC text is a template for regulators. In plain terms, a TPA is a licensed contractor that handles the plan’s paperwork, payments, and phone calls.

The scale is large. A Department of Labor report based on 2022 filings counted 22,436 large self-insured plans with 38.3 million participants. Another 4,539 mixed-funded plans covered 30.1 million more. Those figures leave out most small plans, which do not have to file.

TPA Roles and Responsibilities in a Self-Funded Health Plan

TPA services fall into six groups. The table shows each one beside the part that stays with the employer. Plan documents call the employer the plan sponsor. The right-hand column matters as much as the middle one.

TPA Claims Administration: The Core of the Job

Claims are the center of what a TPA does. Each claim arrives, gets priced against the network contract, and meets the plan’s rules. The administrator then pays it from the employer’s account or issues a denial under the plan’s terms. The clock is federal. Under the DOL claims procedure rule, a group health plan must decide urgent care claims within 72 hours. Pre-service claims get 15 days, and post-service claims get 30. For those two categories, the rule allows one extension of up to 15 days. It applies only to “matters beyond the control of the plan,” and the claimant must receive notice. Urgent care claims have no such extension. Members then have at least 180 days to appeal a denial. Our overview of claims processing outsourcing covers the workflow in more depth.

Eligibility, Enrollment, and Member Services

Eligibility work looks dull and decides everything downstream. The administrator loads enrollment files, applies changes, and issues ID cards. A wrong termination date becomes a wrongly paid claim, so eligibility verification has to be exact. Meanwhile, the service desk answers members and providers by phone. Because that work involves health data, HIPAA applies. HHS says a TPA is generally a business associate of the group health plan.

Vendor Coordination and Reporting

A self-funded plan is a bundle of contracts, and the administrator sits in the middle. It connects the provider network, the pharmacy benefit manager, and the stop-loss carrier. Stop-loss insurance reimburses the employer when claims pass a set threshold, and the administrator usually files those claims. Reporting completes the picture. For example, plans must attest each year, by December 31, that their contracts contain no gag clauses. The plan owns that duty, but it leans on the administrator’s data to meet it.

What a TPA Does Not Do: The Fiduciary Line

Hiring a TPA moves the work, not the responsibility. Under ERISA, the federal law covering most private employer plans, the employer usually remains a fiduciary. DOL’s guide for group health plan fiduciaries explains the test. Fiduciary status “is based on the functions performed for the plan, not just a person’s title.” Anyone who uses discretion in running the plan is a fiduciary to that extent.

The same guide says a TPA “who performs solely ministerial tasks is not a fiduciary.” A DOL interpretive bulletin lists such tasks, including applying eligibility rules, preparing employee communications, and processing claims. However, the guide adds a warning. That status “may change if they exercise discretion in deciding on a participant’s eligibility for benefits.” An administrator that decides appeals with real discretion may therefore be a fiduciary for those decisions.

The Employer’s Duty to Monitor the TPA

Selection is a fiduciary act, and so is oversight. Employers must “monitor the service provider periodically,” the DOL guide says, and confirm that administration stays prudent. In practice, that means reviewing performance, reading the reports, checking the fees, and following up on participant complaints. PwC’s 2027 cost outlook makes the same point for large self-funded employers. It recommends linking “vendor oversight, carrier performance, and benefit strategy directly to claims experience.” An administrator should therefore expect questions, and a good one welcomes them.

TPA, ASO, or Insurance Carrier: Who Carries the Risk?

Three arrangements get confused, and the difference is who holds the risk. In a fully insured plan, the carrier generally bears the claims risk under the policy. In a self-funded plan, the employer generally funds the claims and hires an administrator. That administrator can be an independent TPA or an insurer selling administrative services only, known as an ASO. The table shows typical arrangements, and individual contracts differ.

Smaller employers often choose a middle path. KFF found that 37 percent of covered workers at firms with 10 to 199 workers are in level-funded plans. Those pair a small self-funded layer with stop-loss coverage. Either way, the administrator’s job looks much the same. That is why the question applies well beyond pure self-funding.

Where the Gaps Appear in TPA Administration

None of this describes a failing. The gaps in TPA administration are structural, and most TPAs would name them without prompting. They come from four fixed points that meet a workload nobody can fix in place.

A Fixed Fee Meets Variable Work

A TPA typically earns a fixed administrative fee per employee per month. Claim volume, call volume, and appeals do not stay fixed. Meanwhile, costs keep climbing. PwC projects a group medical cost trend of 9 percent for 2027. Higher costs tend to bring more scrutiny from plan sponsors and more questions from members. As a result, every extra manual touch comes straight out of the margin.

The January 1 Surge

Many plan years start on January 1. Enrollment files, new ID cards, and benefit questions therefore arrive together. New client implementations land in the same weeks. It may be the only business whose busiest day is also a public holiday. Staffing for that peak all year is expensive, and staffing for the average leaves January short.

Language and After-Hours Coverage

Members do not all call in English, or at noon. The federal claims and appeals rule requires “oral language services (such as a telephone customer assistance hotline).” The duty applies in counties where 10 percent or more of residents are literate only in one non-English language. For many plans, that language is Spanish. Consequently, a bilingual service desk is a compliance matter as well as a courtesy.

Federal Deadlines With Little Room to Flex

The federal claim deadlines do not stretch because a team is short-staffed. An urgent care claim still needs a decision within 72 hours. An appeal still needs a full and fair review. The one permitted extension is narrow, as noted above. Therefore, backlogs carry legal weight, not just service cost. A fixed fee does not know it is January, and neither does the regulation.

How TPAs Can Identify Administrative Capacity Gaps

A temporary spike and a lasting capacity problem look alike in the first week. TPAs can tell them apart by tracking four signals together, not one at a time. The table sets them out.

Read the four together. For example, rising volume with a flat backlog is a busy month. Rising volume with a growing backlog and more repeat contacts is a capacity gap. That second pattern is the point to add capacity for routine work, before deadlines come under pressure.

How TPAs Close the Gaps With Support Partners

The fiduciary rules point to the answer. The DOL bulletin on ministerial work gives the test. The bulletin covers work “within a framework of policies, interpretations, rules, practices and procedures made by other persons.” That is also a fair description of what an administrator can hand to a partner. The administrator writes the rules and keeps the decisions. The partner carries out the defined steps.

In practice, the work that moves is high in volume and low in discretion. It includes member and provider calls, eligibility data entry, claim status research, and document indexing. It also includes outbound follow-up for missing information. By contrast, adjudication authority, appeal decisions, and plan interpretation stay in-house. A partner that offers to take those is offering the wrong thing. That division is the basis of a sound TPA outsourcing arrangement.

What to Ask a TPA Support Partner

Start with data protection. A partner that handles member data for an administrator takes on business associate obligations as well. Ask for the agreement and the controls behind it. Our guide to HIPAA-compliant support covers the safeguards. Next, ask how the partner logs each interaction, because your plan sponsors will audit you. Finally, check the scope behind each credential on its certifications page, not just the logo.

Where SkyCom Fits in TPA Administration

SkyCom works on the ministerial side of that line. Our nearshore teams provide TPA support services in English and Spanish. That covers claims support and research, eligibility and enrollment processing, and member and employer services. The same teams support claims processing and back-office work for other healthcare clients. We follow the client’s procedures, and the client keeps every determination.

Conclusion: What a TPA Does, and Where It Needs Support

So what does a TPA do? It turns an employer’s promise to pay for care into a working operation. It pays claims, keeps eligibility straight, answers the phones, and reports back. Also, it does not carry the insurance risk, and it does not remove the employer’s fiduciary duty.

The gaps sit where fixed things meet moving ones. Fees, deadlines, and plan-year dates hold still while volume, cost, and language needs shift. TPAs that separate judgment from routine work handle that best. They keep the judgment and find reliable capacity for the rest.

Frequently Asked Questions: What Does a TPA Do?

What does a TPA do in health insurance?

A TPA administers a self-funded health plan for an employer. It processes claims, maintains eligibility records, serves members and providers, and produces reports. The employer pays the claims and remains responsible for the plan.

Is a TPA an insurance company?

No. A TPA does not take on insurance risk or collect premiums for its own account. It provides administration for a fee. Some insurers also sell administration alone, which the market calls administrative services only.

Who pays the claims in a self-funded health plan?

The employer does, from its own funds or a plan trust. The administrator issues the payments from that account. Many employers also buy stop-loss insurance, which reimburses them when claims pass a set threshold.

Is a TPA a fiduciary under ERISA?

It depends on what the TPA does. DOL guidance says a TPA performing solely ministerial tasks is not a fiduciary. That can change if it uses discretion, for example, when deciding benefit eligibility or appeals.

What is the difference between a TPA and an ASO?

Both administer self-funded plans for a fee. An ASO arrangement comes from an insurance carrier and usually uses that carrier’s network. An independent TPA is typically not tied to one carrier, and its network access depends on the arrangement.

Are TPAs licensed?

In many states, yes. The NAIC model for state regulators requires a TPA license and a written agreement with the payor. The details differ by state, so check the rules where the plan’s members live.

Does HIPAA apply to a TPA?

Yes. HHS says a TPA generally acts as a business associate of the group health plan. It must therefore protect member health information under a business associate agreement.

How is a TPA paid?

Most TPAs charge a fixed administrative fee for each covered employee each month. Some services carry separate charges. Because the main fee is fixed, extra manual work reduces the margin.