BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2012

BASIS OF PRESENTATION

1. BASIS OF PRESENTATION

The accompanying condensed consolidated financial statements are presented in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures normally required by accounting principles generally accepted in the United States of America, or those normally made in an Annual Report on Form 10-K. For further information, the reader of this Form 10-Q should refer to our Form 10-K for the year ended December 31, 2011, that was filed with the Securities and Exchange Commission, or the SEC, on February 24, 2012. We refer to the Form 10-K as the “2011 Form 10-K” in this document. References throughout this document to “we,” “us,” “our,” “Company,” and “Humana” mean Humana Inc. and its subsidiaries.

The preparation of our condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, the impact of risk sharing provisions related to our Medicare contracts, the valuation and related impairment recognition of investment securities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates. Refer to Note 2 to the consolidated financial statements included in our 2011 Form 10-K for information on accounting policies that the Company considers in preparing its consolidated financial statements.

The financial information has been prepared in accordance with our customary accounting practices and has not been audited. In our opinion, the information presented reflects all adjustments necessary for a fair statement of interim results. All such adjustments are of a normal and recurring nature.

Military Services

On April 1, 2012, we began delivering services under a new TRICARE South Region contract with the Department of Defense, or DoD. Under the new contract, we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. Under the terms of the new TRICARE South Region contract, we do not record premiums revenue or benefit expenses in our condensed consolidated statements of income related to these health care costs and related reimbursements. Instead, we account for revenues under the new contract net of estimated health care costs similar to an administrative services fee only agreement. The new contract includes fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed.

Our TRICARE members are served by both in-network and out-of-network providers in accordance with the new TRICARE South Region contract. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments associated with these health care costs and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For the three months ended June 30, 2012, health care cost payments were $515 million, exceeding reimbursements of $459 million by $56 million.

As described in Note 2 to the consolidated financial statements included in our 2011 Form 10-K, our previous TRICARE South Region contract that expired on March 31, 2012 provided a financial interest in the underlying health care cost; therefore, we reported revenues on a gross basis. We shared the risk with the federal government for the cost of health benefits in our previous contract, earning more revenue or incurring additional cost based on the variance of actual health care costs versus an annually negotiated target health care cost.