What are Third-Party Administrators (TPAs)?
A Third-Party Administrator (TPA) is an organization that processes health insurance claims and administers health benefit plans on behalf of a self-funded employer or plan sponsor. Unlike an insurance company, a TPA does not assume the financial risk of paying claims — the employer retains that risk.
The Self-Funded Model
In a self-funded (self-insured) health plan:
- The employer sets aside its own funds to pay employee healthcare claims
- The employer bears the financial risk for claims costs
- A TPA is hired to handle the day-to-day administration
- Stop-loss insurance is typically purchased to cap the employer's exposure to catastrophic claims (either per-individual or aggregate)
Approximately 65% of covered workers in the U.S. are enrolled in self-funded plans, particularly at large employers (companies with 200+ employees).
TPA vs. Insurance Company
| Feature | TPA | Insurance Company |
|---|---|---|
| Risk assumption | No — employer bears risk | Yes — insurer bears risk |
| Premium collection | No premiums (employer funds directly) | Collects premiums from employer/members |
| Claims payment | Pays from employer's account | Pays from insurer's reserves |
| Regulation | Limited state regulation (ERISA preemption) | Heavily regulated by state insurance departments |
| Flexibility | High — employer can customize plan design | Moderate — standardized products |
Services TPAs Provide
- Claims adjudication — Processing medical, dental, pharmacy, and behavioral health claims
- Provider network access — Renting or arranging access to established provider networks (e.g., Aetna, Cigna, or regional networks)
- Utilization review — Prior authorization, concurrent review, and retrospective review
- Member services — Customer support, ID cards, EOBs, appeals processing
- Compliance reporting — ERISA reporting (Form 5500), ACA compliance, HIPAA administration
- Data analytics — Claims reporting, cost trend analysis, population health insights
- Coordination of benefits (COB) — Managing benefits when members have multiple coverage sources
- Subrogation — Recovering costs from third parties (e.g., auto insurance in accident cases)
ASO Arrangements
An Administrative Services Only (ASO) arrangement is a contract where a large insurer (like UnitedHealthcare, Cigna, or Aetna) acts as a TPA for a self-funded employer. The insurer provides its claims platform, provider network, and administrative expertise, but the employer funds the claims. This gives employers the brand recognition and network of a major insurer while retaining the financial flexibility of self-funding.
Major TPAs
Large national TPAs and ASO providers include:
- UnitedHealthcare (ASO)
- Aetna / CVS Health (ASO)
- Cigna (ASO)
- Meritain Health (Aetna subsidiary)
- HealthScope Benefits
- Allegiance Benefit Plan Management
- CoreSource (Trustmark subsidiary)
