SEGMENT INFORMATION
We operate in one reportable segment. Our chief operating decision maker for segment reporting purposes is our CEO, who uses the profitability and significant expense detail to allocate resources and assess performance based on key functions such as customer acquisition, customer service, and indirect costs.
The primary measure of profit or loss that the CEO uses is net income. The significant expenses used in these profit or loss reports align with the primary functions of the corresponding teams, with the exception of non-cash expenses such as depreciation, amortization and stock based compensation as these expenses are not necessarily indicative of our ongoing operations. In this expense reporting methodology, overhead-type expenses, such as facilities and technology support for colleagues, are classified consistent with the primary function of the corresponding teams and not allocated to other significant expenses.
The table below provides the primary measure of profitability and detail regarding the significant expenses reviewed by our CEO.
 Year Ended December 31,
(in millions)202520242023
Professional service revenues
$719 $765 $756 
Insurance service revenues
4,224 4,224 4,166 
Interest income67 64 72 
Total revenues
5,010 5,053 4,994 
Workers' compensation costs72 61 68 
Health insurance costs3,763 3,736 3,445 
Sales & marketing235 259 254 
Client support costs169 184 186 
Corporate administration160 146 165 
System support & development196 190 187 
Depreciation and amortization of intangible assets
66 75 72 
Stock based compensation65 65 59 
Other11 49 17 
Interest expense, bank fees and other56 62 40 
Income Taxes62 53 126 
Net Income155 173 375 
Other includes certain costs that are considered non-recurring such as restructuring costs and transaction and integration costs related to acquisitions in previous years.

About Segments Disclosures

Segment disclosures break a company into its reportable operating units, revealing revenue, profit, and asset allocation that consolidated financial statements obscure. Under ASC 280, segments must match how the chief operating decision maker views the business, providing a window into internal management structure and resource allocation priorities.

Key signals: compare segment margins to identify which units drive profitability and which destroy value. Watch for changes in the number of reportable segments — segment aggregation or disaggregation often coincides with strategic shifts or attempts to obscure declining performance. Intersegment elimination patterns reveal internal pricing practices. The reconciliation between segment totals and consolidated figures exposes corporate overhead allocation and unallocated items. Geographic revenue concentration highlights regulatory and currency exposure. Compare segment-level capital expenditure against segment revenue to assess where management is investing for future growth versus harvesting existing assets.