Administrative Services Only (ASO)

An Administrative Services Only (ASO) arrangement is a service contract under which a carrier or third-party administrator handles the day-to-day operation of a self-funded health plan — adjudicating claims, maintaining the provider network, issuing member ID cards, managing appeals, and handling required reporting — without assuming any of the insurance risk. The dollars that actually pay claims come from the employer's own account. In other words, the vendor sells its plumbing and network, not its balance sheet, and charges a per-employee-per-month administrative fee instead of a risk-bearing premium.

ASO matters because it gives a small or mid-size employer access to a big carrier's negotiated provider discounts, claims technology, and compliance machinery while still capturing the cost advantages of self-funding. It is what makes self-funding practical: few employers want to build a claims department, so they rent one. The arrangement is almost always paired with stop-loss insurance to cap catastrophic exposure, and the ASO administrator often coordinates stop-loss reimbursement filings on the employer's behalf. Because the administrator is not the insurer, the employer — as plan sponsor and ERISA fiduciary — retains ultimate legal responsibility for the plan.

The practical nuance is fee transparency and fiduciary duty. Employers should scrutinize the ASO agreement for hidden revenue streams — network access fees, shared savings on out-of-network claims, and pharmacy rebate retention — that can quietly raise the true cost of 'administration.' They should also confirm which party holds discretionary claim-denial authority, because that affects liability exposure and may make separate employee benefits liability or fiduciary coverage advisable. A well-negotiated ASO contract spells out run-out claim handling if the employer changes vendors, performance guarantees on claim accuracy and turnaround, and clear data-ownership rights so the employer keeps its own claims history.