EXHIBIT (a)(1)(O)

EMAIL COMMUNICATION TO EMPLOYEES - EMDEON TENDER OFFER

      As you may have heard, Emdeon recently announced an offer to purchase up
to 60,000,000 shares of Emdeon common stock, at a price of $8.20 per share,
without interest. A copy of the press release announcing the tender offer is
attached. [copy of Press Release included as Exhibit (a)(1)(G) to this Schedule
TO was attached]

      You may participate in the tender offer if you hold (1) Emdeon common
stock outright (whether you hold the shares through a broker or by holding a
stock certificate), (2) Emdeon common stock in a 401(k) plan or through Emdeon's
Performance Incentive Plan, or (3) options to purchase Emdeon common stock that
are vested or will vest before the tender offer expires (currently December 21,
2005). Please note that shares of restricted stock that have not vested are not
eligible for the tender offer.

      Every individual will need to come to his or her own determination as to
whether to participate in the offer. Although Emdeon's Board of Directors
approved making the offer, neither Emdeon nor the Board is making any
recommendation as to whether holders should participate. You should carefully
review the offer materials and discuss the offer with your tax and other
personal advisors before deciding whether to participate. In addition, Emdeon is
not rendering any tax advice in connection with the offer.

      Information about the tender offer, including the procedures you must
follow to participate, is available as described below.

STOCKHOLDERS

      If you hold shares of Emdeon common stock in a brokerage account, you may
wish to contact the broker to make sure you get a copy of the offering documents
and any other forms your broker may require you to complete. If you hold shares
in a certificate, our transfer agent will be sending you the offering documents.
In either case, you may request copies from Innisfree M&A Incorporated, the
information agent for the tender offer, by calling (888) 750-5834.

401(k) PLANS AND PERFORMANCE INCENTIVE PLAN

      If you hold shares in a 401(k) plan maintained by Emdeon or one of its
subsidiaries or the Performance Incentive Plan, you will receive information
about the tender offer from the applicable plan trustee. 401(k) Plan
participants may obtain additional information from Fidelity Management Trust
Corporation at (800) 835-5097. Performance Incentive Plan participants may
obtain additional information by contacting BenefitConnect at (800) 204-7064.
SPECIAL RULES APPLY TO PLAN PARTICIPANTS, SO IT IS IMPORTANT YOU READ THE
MATERIALS THAT THE PLAN TRUSTEE WILL SEND TO YOU.

VESTED OPTIONS TO PURCHASE EMDEON COMMON STOCK

      If you hold options to purchase Emdeon common stock that are vested or
will vest before the tender offer expires, you may participate in the tender
offer by (1) exercising your vested options and (ii) tendering shares of Emdeon
common stock acquired upon exercise. More

                                       1

information regarding your rights as a holder of vested stock options is
available in a communication to optionholders that is posted on our
corporate intranet at [link].

      Please contact Sandra Keahey at (201) 703-3492 or Mary Gennarelli at (201)
398-2621 with any questions about your stock options or if you would like to
receive a copy of communication to optionholders posted on our corporate
intranet.

      Once you have exercised your stock options, you must elect to participate
in the tender offer by following the instructions set forth in the optionholder
letter or contacting Innisfree M&A Incorporated at (888) 750-5834. PLEASE BE
AWARE THAT IF YOU CHOOSE TO EXERCISE OPTIONS, AND YOUR SHARES ARE NOT ACCEPTED
IN THE TENDER OFFER, YOU MAY NOT RESCIND YOUR OPTION EXERCISE.

                                       2