Officers? Certificate and Company Order

Exhibit 4.1

UNITEDHEALTH GROUP INCORPORATED

$250,000,000 Floating Rate Notes due February 7, 2011

Officers’ Certificate and Company Order

Pursuant to the Indenture, dated as of February 4, 2008 (the “Indenture”), between UnitedHealth Group Incorporated, a Minnesota corporation (the “Company”) and U.S. Bank National Association, as trustee (the “Trustee”) and resolutions adopted by the Company’s Board of Directors on October 30, 2007, this Officers’ Certificate and Company Order is being delivered to the Trustee to establish the terms of a series of Securities in accordance with Section 301 of the Indenture, to establish the form of the Securities of such series in accordance with Section 201 of the Indenture, to request the authentication and delivery of the Securities of such series pursuant to Section 303 of the Indenture and to comply with the provisions of Section 102 of the Indenture. This Officers’ Certificate and Company Order shall be treated for all purposes under the Indenture as a supplemental indenture thereto.

All conditions precedent provided for in the Indenture relating to (i) the establishment of a series of Securities, (ii) the establishment of the form of Securities of such series and (iii) the procedures for authentication and delivery of such series of securities have been complied with.

Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to them in the Indenture.

There is hereby established pursuant to Section 301 of the Indenture a series of Securities which shall have the following terms:

The provision related to interest on overdue principal in Section 501 of the Indenture shall not be applicable to the Notes.

The rate of interest on the Notes will be 4.46188% on February 7, 2008, and will be reset on each Interest Payment Date thereafter (the date on which each such reset occurs, an “Interest Reset Date”).

On each Interest Reset Date, the rate of interest on the Notes shall be determined with respect to an Interest Determination Date. The second London Business Day preceding an Interest Reset Date will be the interest determination date (the “Interest Determination Date”) for that Interest Reset Date.

Interest on each of the Notes will accrue from and including, February 7, 2008, to and excluding, the first Interest Payment Date and then from and including, the immediately preceding Interest Payment Date to which interest has been paid or duly provided for to but excluding, the next Interest Payment Date or date of Maturity, as the case may be, each such period an “Interest Period.” Accrued interest from February 7, 2008, or from the last date on which interest has been paid or duly provided for, to the date for which interest is being calculated shall be calculated by multiplying the face amount of the applicable Note by the applicable accrued interest factor (the “Accrued Interest Factor”). The Accrued Interest Factor shall be computed by adding the interest factor calculated for each day from February 7, 2008, or from the last date to which interest has been paid or duly

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provided for, to the date for which accrued interest is being calculated. The Accrued Interest Factor for each day shall be computed by dividing the per annum interest rate applicable to such day by 360. The interest rate in effect on each day will be (i) if such day is an Interest Reset Date, the interest rate determined as of the Interest Determination Date pertaining to such Interest Reset Date or (ii) if such day is not an Interest Reset Date and falls after the first Interest Reset Date, the interest rate determined as of the Interest Determination Date pertaining to the immediately preceding Interest Reset Date or (iii) if such day is not an Interest Reset Date and falls before the first Interest Reset Date, 4.46188%.

All percentages resulting from the above calculation will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward (e.g., 9.876545% (or .09876545) being rounded to 9.87655% (or .0987655)) and all dollar amounts used in or resulting from such calculations will be rounded to the nearest cent (with one-half cent being rounded upward).

LIBOR will be determined by the Calculation Agent in accordance with the following provisions:

(i) With respect to an Interest Period, LIBOR will be the rate (expressed as a percentage per annum) for deposits in United States dollars having a three-month maturity that appears on Reuters LIBOR01 at approximately 11:00 A.M. London time on the Interest Determination Date. If on an Interest Determination Date such rate does not appear on Reuters LIBOR01 at such time, or if the Reuters LIBOR01 is not available on such date, then LIBOR, in respect of that Interest Determination Date, will be determined in accordance with the provisions described in (ii) below.

(ii) With respect to an Interest Determination Date on which no rate appears as specified in (i) above, the Calculation Agent will obtain such rate from Bloomberg’s “BBAM.” If such rate does not appear on Reuters LIBOR01or Bloomberg’s page “BBAM” on an Interest Rate Determination Date at approximately 11:00 A.M., London time, then the Calculation Agent will request the principal London office of each of four major banks in the London interbank market, as selected by the Calculation Agent, to provide the Calculation Agent with its offered quotation of the rate (expressed as a percentage per annum) offered by it to prime banks in the London interbank market for three-month deposits in United States dollars in a principal amount of at least $1,000,000 at approximately 11:00 A.M., London time, on such Interest Determination Date. If at least two such quotations are so provided, then LIBOR on that Interest Determination Date will be the arithmetic mean of those quotations. If fewer than two such quotations are so provided, the Calculation Agent will request each of three major banks in New York City, as selected by the Calculation Agent, to provide a quotation of the rate (expressed as a percentage per annum) offered by it for loans in

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United States dollars to leading European banks, having a three-month maturity in a principal amount of at least $1,000,000 at approximately 11:00 A.M., New York City time, on such Interest Determination Date. If at least two such rates are so provided, the rate for the interest period will be the arithmetic mean of such rates. If fewer than two such rates are so provided, then the rate for the Interest Period will be the rate in effect with respect to the immediately preceding Interest Period.

“Reuters LIBOR01” means the Capital Markets Report Screen LIBOR01 of Reuters, or any successor service or page, for the purpose of displaying the London interbank rates of major banks for United States dollars.

U.S. Bank National Association will be the “Calculation Agent.” The Calculation Agent shall calculate the interest rate in accordance with the foregoing. On or before each Calculation Date, the Calculation Agent will determine the interest rate and notify the paying agent. All calculations of the Calculation Agent, in the absence of manifest error, shall be conclusive and binding and neither the Trustee nor the paying agent shall have the duty to verify determinations of interest rates made by the Calculation Agent. The determinations of the Accrued Interest Factor made by the paying agent shall be conclusive and binding. The “Calculation Date” pertaining to any Interest Determination Date on a Note will be the earlier of (i) the tenth calendar day after such Interest Determination Date, or, if any such day is not a Business Day, the next succeeding Business Day, and (ii) the Business Day immediately preceding the applicable Interest Payment Date or the date of Maturity, as the case may be.

Notwithstanding the foregoing, the interest rate shall in no event be higher than the maximum rate permitted by New York law as the same may be modified by United States law of general application.

If a Change of Control Triggering Event (as defined herein) occurs, unless the Company has exercised its option to redeem the Notes of this series, the Company

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shall be required to make an offer (a “Change of Control Offer”) to each Holder of the Notes of this series to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of that Holder’s Notes on the terms set forth herein. In a Change of Control Offer, the Company shall be required to offer payment in cash equal to 101% of the aggregate principal amount of Notes of this series repurchased, plus accrued and unpaid interest, if any, on the Notes of this series repurchased to the date of repurchase (a “Change of Control Payment”). Within 30 days following any Change of Control Triggering Event or, at the Company’s option, prior to any Change of Control, but after public announcement of the transaction that constitutes or may constitute the Change of Control, a notice shall be mailed to Holders of the Notes of this series describing the transaction that constitutes or may constitute the Change of Control Triggering Event and offering to repurchase such Notes on the date specified in the notice, which date shall be no earlier than 30 days and no later than 60 days from the date such notice is mailed (a “Change of Control Payment Date”). The notice shall, if mailed prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on the Change of Control Triggering Event occurring on or prior to the Change of Control Payment Date.

In order to accept the Change of Control Offer, the Holder must deliver to the Paying Agent, at least five Business Days prior to the Change of Control Payment Date, the Note together with the form entitled “Election Form” (which form is annexed to the Note) duly completed, or a telegram, telex, facsimile transmission or a letter from a member of a national securities exchange, or the Financial Industry Regulatory Authority or a commercial bank or trust company in the United States setting forth:

Any exercise by a Holder of its election to accept the Change of Control Offer shall be irrevocable. The Change of Control Offer may be accepted for less than the entire principal amount of the Note, but in that event the principal amount of the Note remaining outstanding after repurchase must be equal to $2,000 or an integral multiple of $1,000 in excess thereof.

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On the Change of Control Payment Date, the Company shall, to the extent lawful:

The Company shall not be required to make a Change of Control Offer upon the occurrence of a Change of Control Triggering Event if a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by the Company and the third party purchases all Notes of this series properly tendered and not withdrawn under its offer. In addition, the Company shall not repurchase any Notes of this series if there has occurred and is continuing on the Change of Control Payment Date an Event of Default under the Indenture, other than a default in the payment of the Change of Control Payment upon a Change of Control Triggering Event.

The Company shall comply with the requirements of Rule 14e-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes of this series as a result of a Change of Control Triggering Event. To the extent that the provisions of any such securities laws or regulations conflict with the Change of Control Offer provisions of the Notes of this series, the Company shall comply with those securities laws and regulations and shall not be deemed to have breached its obligations under the Change of Control Offer provisions of the Notes of this series by virtue of any such conflict.

For purposes of the Change of Control Offer provisions of the Notes of this series, the following terms are applicable:

“Change of Control” means the occurrence of any of the following: (1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or more series of related transactions, of all or substantially all of the assets of the Company and its Subsidiaries, taken as a whole, to any person, other than the Company or a Subsidiary; (2) the consummation of any

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transaction (including, without limitation, any merger or consolidation) the result of which is that any person becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the Company’s outstanding Voting Stock or other Voting Stock into which the Company’s Voting Stock is reclassified, consolidated, exchanged or changed, measured by voting power rather than number of shares; (3) the Company consolidates with, or merges with or into, any person, or any person consolidates with, or merges with or into, the Company, in any such event pursuant to a transaction in which any of the Company’s outstanding Voting Stock or the Voting Stock of such other person is converted into or exchanged for cash, securities or other property, other than any such transaction where the shares of the Company’s Voting Stock outstanding immediately prior to such transaction constitute, or are converted into or exchanged for, a majority of the Voting Stock of the surviving person or any direct or indirect parent company of the surviving person immediately after giving effect to such transaction; (4) the first day on which a majority of the members of the Company’s Board of Directors are not Continuing Directors; or (5) the adoption of a plan relating to the Company’s liquidation or dissolution. Notwithstanding the foregoing, a transaction shall not be deemed to involve a Change of Control under clause (2) above if (i) the Company becomes a direct or indirect wholly-owned subsidiary of a holding company and (ii)(A) the direct or indirect holders of the Voting Stock of such holding company immediately following that transaction are substantially the same as the holders of the Company’s Voting Stock immediately prior to that transaction or (B) immediately following that transaction no person (other than a holding company satisfying the requirements of this sentence) is the beneficial owner, directly or indirectly, of more than 50% of the Voting Stock of such holding company. The term “person,” as used in this definition, has the meaning given thereto in Section 13(d)(3) of the Exchange Act.

“Change of Control Triggering Event” means the occurrence of both a Change of Control and a Rating Event.

“Continuing Directors” means, as of any date of determination, any member of the Company’s Board of Directors who (1) was a member of such Board of Directors on the date the Notes of this series were issued or (2) was nominated for election, elected or appointed to such Board of Directors with the approval of a majority of the Continuing Directors who were members of such Board of Directors at the time of such nomination, election or appointment (either by a specific vote or by approval of the Company’s proxy statement in which such member was named as a nominee for election as a director, without objection to such nomination).

“Fitch” means Fitch Inc., and its successors.

“Investment Grade Rating” means a rating equal to or higher than BBB- (or the equivalent) by Fitch, Baa3 (or the equivalent) by Moody’s and BBB- (or the equivalent) by S&P, and the equivalent investment grade credit rating from any replacement rating agency or rating agencies selected by the Company.

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“Moody’s” means Moody’s Investors Service, Inc., and its successors.

“Rating Agencies” means (1) each of Fitch, Moody’s and S&P; and (2) if any of Fitch, Moody’s or S&P ceases to rate the Notes of this series or fails to make a rating of such Notes publicly available for reasons outside of the Company’s control, a “nationally recognized statistical rating organization” within the meaning of Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act selected by the Company (as certified by a resolution of the Company’s Board of Directors) as a replacement agency for Fitch, Moody’s or S&P, or all of them, as the case may be.

“Rating Event” means the rating on the Notes of this series is lowered by at least two of the three Rating Agencies and the Notes of this series are rated below an Investment Grade Rating by at least two of the three Rating Agencies on any day during the period (which period shall be extended so long as the rating of the Notes of this series is under publicly announced consideration for a possible downgrade by any of the Rating Agencies) commencing on the date of the first public notice of the occurrence of a Change of Control or the Company’s intention to effect a Change of Control and ending 60 days following consummation of such Change of Control.

“S&P” means Standard & Poor’s Rating Services, a division of The McGraw-Hill Companies, Inc., and its successors.

“Voting Stock” means, with respect to any specified “person” (as that term is used in Section 13(d)(3) of the Exchange Act) as of any date, the capital stock of such person that is at the time entitled to vote generally in the election of the board of directors of such person.

The Company will not, and will not permit any Restricted Subsidiary to, create, assume, incur or suffer to exist:

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Notwithstanding the foregoing, the Company may, and may permit any Restricted Subsidiary to, create, assume, incur or suffer to exist any Lien upon any stock or Indebtedness of any Restricted Subsidiary or upon any Principal Property without equally and ratably securing the Securities if the aggregate amount of all Indebtedness then outstanding secured by such Lien and all similar Liens does not exceed 10% of the Consolidated Net Worth of the Company as of the most recent quarterly consolidated balance sheet of the Company prepared in accordance with GAAP; provided, that Indebtedness secured by Permitted Liens shall not be included in the amount of such secured Indebtedness.

“Consolidated Net Worth” means, with respect to any Person as of any date, the sum of (i) the consolidated equity of the common stockholders of such Person and its consolidated Subsidiaries as of such date, plus (ii) the respective amounts reported on such Person’s balance sheet as of such date with respect to any series of preferred stock (other than Disqualified Stock) that by its terms is not entitled to the payment of dividends unless such dividends may be declared and paid only out of net earnings in respect of the year of such declaration and payment, but only to the extent of any cash received by such Person upon issuance of such preferred stock, less (x) all write-ups (other than write-ups resulting from foreign currency translations and write-ups of tangible assets of a going concern business made within 12 months after the acquisition of such business) subsequent to the date of the initial issuance of the Notes in the book value of any asset owned by such Person or a consolidated Subsidiary of such Person, and (y) all unamortized debt discount and expense and unamortized deferred charges as of such date, all of the foregoing determined in accordance with GAAP.

“Disqualified Stock” means any Capital Stock that, by its terms (or by the terms of any security into which it is convertible or for which it is exchangeable), or upon the happening of any event, matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at the option of the Holder thereof, in whole or in part, on or prior to the date that is 91 days after the date on which the Securities mature.

“Permitted Liens” means

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“Principal Property” means the land, land improvements, buildings and fixtures (to the extent they constitute real property interests) (including any leasehold interest therein) constituting the Company’s principal corporate office or any other discrete facility of the Company and its Subsidiaries (whether owned at the date of initial issuance of the Notes or thereafter acquired), provided in each case that such facility

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“Restricted Subsidiary” means each Subsidiary of the Company existing as of the date of date of init