Exhibit 99.1
 Explanation of Non-GAAP Financial Measures
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    Depreciation and Amortization. Depreciation and amortization expense is a non-cash
expense relating to capital expenditures and intangible assets arising from
acquisitions that are expensed on a straight-line basis over the estimated useful life
of the related assets. WebMD excludes depreciation and amortization expense from
Adjusted EBITDA because it believes (i) the amount of such expenses in any specific
period may not directly correlate to the underlying performance of WebMDs business
operations and (ii) such expenses can vary significantly
between periods as a result of new acquisitions and full amortization of previously
acquired tangible and intangible assets. Accordingly, WebMD believes this exclusion




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assists management and investors in making period-to-period comparisons of operating
performance. Investors should note that use of tangible and intangible assets
contributed to revenue in the periods presented and will contribute to future revenue
generation and should also note that such expenses will recur in future periods.
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    Stock-Based Compensation Expense. Stock-based compensation expense is a non-cash
expense arising from the grant of stock-based awards to employees. WebMD believes that
excluding the effect of stock-based compensation from Adjusted EBITDA assists
management and investors in making period-to-period comparisons in its operating
performance because it believes (i) the amount of such expenses in any specific period
may not directly correlate to the underlying performance of WebMDs business
operations and (ii) such expenses can vary significantly between periods as a result
of the timing of grants of new stock-based awards, including grants in connection with
acquisitions. Additionally, WebMD believes that excluding stock-based compensation
from Adjusted EBITDA assists management and investors in making meaningful comparisons
between WebMDs operating performance and the operating performance of other companies
that may use different forms of employee compensation or different valuation
methodologies for their stock-based compensation. Investors should note that
stock-based compensation is a key incentive offered to employees whose efforts
contributed to the operating results in the periods presented and are expected to
contribute to operating results in future periods. Investors should also note that
such expenses will recur in the future.
    
    Non-Cash Advertising Expense.This expense relates to the usage of non-cash
advertising obtained from News Corporation (Newscorp) in exchange for equity
securities issued by our parent, HLTH Corporation in 2000. The advertising was
available only on various Newscorp properties, primarily its television network and
cable channels, without any cash cost to WebMD and expired this year. WebMD excludes
this expense from Adjusted EBITDA (i) because it is a non-cash expense, (ii) because
it is incremental to other non-television cash advertising expense that WebMD
otherwise incurs and (iii) to assist management and investors in comparing its
operating results over multiple periods. Investors should note that it is likely that
WebMD derives some benefit from such advertising.
    
    Interest Income.Interest income is associated with the level of marketable debt
securities and other interest bearing accounts in which WebMD invests.  Interest
income varies over time due to varying levels of securities available for investment.
Transactions that WebMD has entered into in recent periods that have impacted
securities available for investment include the initial public offering of equity in
WebMD and acquisitions of other companies for varying amounts of cash since our
initial public offering. Additional financing transactions as well as potential
acquisitions that WebMD may enter into in the future could impact the levels and
timing of securities available for investment. WebMD excludes interest income from
Adjusted EBITDA (i) because it is not directly attributable to the performance of
WebMDs business operations and, accordingly, its exclusion assists management and
investors in making period-to-period comparisons of operating performance and (ii) to
assist management and investors in making comparisons to companies with different
capital structures. Investors should note that interest income will recur in future
periods.
    
    Income Tax Provision (Benefit).WebMD maintains a valuation allowance on a portion
of its net operating loss carryforwards, the amount of which may change from quarter
to quarter based on factors that are not directly related to WebMDs results for the
quarter. The valuation allowance is either reversed through the statement of
operations or additional paid-in capital. The timing of such reversals has not been
consistent and as a result, WebMDs income tax expense can fluctuate significantly
from period to period in a manner not directly related to WebMDs operating
performance. WebMD excludes the income tax provision (benefit) from Adjusted EBITDA
(i) because it believes that the income tax provision (benefit) is not directly
attributable to the underlying performance of WebMDs business operations and,
accordingly, its exclusion assists management and investors in making period-to-period
comparisons of operating performance and (ii) to assist management and investors in
making comparisons to
companies with different tax attributes. Investors should note that income tax
provision (benefit) will recur in future periods.




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    Other Items.WebMD engages in other activities and transactions that can impact
WebMDs overall income (loss) from continuing operations. WebMD excludes these other
items from Adjusted EBITDA when it believes these activities or transactions are not
directly attributable to the performance of WebMDs business operations and,
accordingly, their exclusion assists management and investors in making
period-to-period comparisons of operating performance. Investors should note that
these other items may recur in future periods. In the MD&A, WebMD has excluded loss
on the impairment of auction rate securities from Adjusted EBITDA.