Exhibit 4.23

  

   

  

  
    FORM OF FACE OF EXCHANGE NOTE

    

    

    UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO THE COMPANY OR ITS
      AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO., OR
      TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
      HEREIN.

    

    

    TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO DTC, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL NOTE
      SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE INDENTURE REFERRED TO ON THE REVERSE HEREOF.

    

    

    
      
        


    

    FORM OF NOTE

    

    

    CIGNA CORPORATION

    4.125% Notes due 2020

    

    

    	
            CUSIP: 125523 CH1

          	 
	
            ISIN: US125523CH10

          	 
	 	 
	
            No. E-1

          	
            Principal Amount $[●]

          


    

    

    CIGNA CORPORATION, a Delaware corporation (herein called the “Company”), which term includes any successor Person under the Indenture hereinafter referred to,
      for value received, hereby promises to pay to CEDE & CO., or its registered assigns, the principal sum of [●] Dollars ($[●]) upon presentation and surrender of this Security on September 15, 2020 and to pay interest thereon accruing from [•], or
      from the most recent date to which interest has been paid or duly provided for, semi-annually in arrears on March 15 and September 15 of each year, commencing on [•], and on the Maturity of this Security, (each an “Interest Payment Date”) at
      the rate of 4.125% per annum, until the principal hereof is paid or made available for payment. The amount of interest payable on this Security on any Interest Payment Date shall be computed on the basis of a 360-day year consisting of twelve 30-day
      months. The amount of interest payable for any period shorter than a full monthly period shall be computed on the basis of the actual number of calendar days elapsed in such a period. The interest so payable, and punctually paid or duly provided for,
      on any Interest Payment Date will be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date, which shall be the close of
        business on the date that is fifteen (15) calendar days prior to the date on which interest is scheduled to be paid, regardless of whether such date is a Business Day (provided that if this Security
      is held by a securities depositary in book-entry form, the Regular Record Date for this Security will be the close of business on the Business Day immediately preceding the date on which interest is scheduled to be paid; provided, further, that interest payable at the relevant Maturity will be payable to the Persons to whom the principal of this Security is payable). If an Interest Payment Date is not a
      Business Day, then such Interest Payment Date shall be the next succeeding Business Day, and no further interest will accrue as a result of such delay. Any such interest not punctually paid or duly provided for on any Interest Payment Date shall
      forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the
      payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than ten (10) calendar days prior to such Special Record Date, or be paid at any time in any other lawful
      manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture.

    

    

    Payment of the principal of (and premium, if any) and interest on this Security will be made at the Corporate Trust Office of the Trustee or the Paying Agent’s office maintained for that purpose in
      the Borough of Manhattan, City of New York, in such coin or currency of the United States of America that at the time of payment is legal tender for payment of public and private debts.

     

    

    
      
        


    

    Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this
      place.

    

    

    Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the
      Indenture or be valid or obligatory for any purpose.

    

    

    
      
        


    

    IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed.

     

    

    	 	
            CIGNA CORPORATION

          	 
	 	 	 
	 	
            By:

          	 	 
	 	 	
            Name:

          	 
	 	 	
            Title:

          	 


    

    

    	
            Attest:

          	 
	 	 
	
            By:

          	 	 
	 	
            Name:

          	 
	 	
            Title:

          	 


    

    

    
      
        


    

    TRUSTEE’S CERTIFICATE OF AUTHENTICATION

    

    

    This is one of the Securities of the series designated under, and referred to in, the within-mentioned Indenture.

     

    

    	 	
            U.S. BANK NATIONAL ASSOCIATION, 

            

          
	 	as Trustee
	 	 
	 	
            By:

          	 	 
	 	 	
            Authorized Signatory

          	 


    

    

    
      
        


    

    REVERSE SIDE OF SECURITY

    

    

    CIGNA CORPORATION

    4.125% Notes due 2020

    

    

    This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued and to be issued in one or more series under an
      Indenture, dated as of September 17, 2018 (the “Base Indenture”), as supplemented by the Supplemental Indenture No. 3, dated as of October 11, 2019 (the “Supplemental Indenture” and, together with the Base Indenture and as may be
      further amended and supplemented, the “Indenture”), between the Company, as issuer, and U.S. Bank National Association, as trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), to which
      Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the
      terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the series designated on the face hereof, initially limited in aggregate principal amount to $500,000,000, subject to future issuances of
      additional Securities pursuant to Section 3.01 of the Base Indenture.

    

    

    At any time prior to September 15, 2020, the Company may redeem Securities of this series, in whole or in part, at a redemption price equal to the greater of (i) 100% of the
      principal amount of the Securities of this series to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest (excluding interest accrued to the Redemption Date) on the Securities of this series
      to be redeemed from the Redemption Date to September 15, 2020, discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the applicable Treasury Rate plus 25 basis points, plus, in each
      case, accrued and unpaid interest, if any, on the principal amount of the Securities being redeemed to but excluding the Redemption Date.

    

    

    Notice of redemption shall be mailed or otherwise delivered in accordance with the applicable procedures of the Depository at least fifteen (15) but not more than sixty (60)
      days before the Redemption Date, to each Holder of the Securities to be redeemed. If less than all of the Notes then Outstanding of any series are to be redeemed, the Trustee will select the particular Notes or portions thereof in accordance with
      Section 11.03 of the Base Indenture.

    

    

    “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term
      of the Securities of this series to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of
      the Securities of this series to be redeemed.

    

    

    “Comparable Treasury Price” means, with respect to any Redemption Date for any Securities of this series, the average of all Reference Treasury Dealer Quotations obtained
      by the Company.

    

    

    “Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Company from time to time.

     

    

    
      
        


    

    “Primary Treasury Dealer” means a primary U.S. government securities dealer in the United States.

    

    

    “Reference Treasury Dealer” means each of J.P. Morgan Securities LLC, Deutsche Bank Securities, Inc. and Wells Fargo Securities LLC, and their respective successors; provided, however,
      that if any Reference Treasury Dealer ceases to be a Primary Treasury Dealer, the Company will substitute another Primary Treasury Dealer for that dealer.

    

    

    “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Company, of the bid and asked prices for
      the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Company by that Reference Treasury Dealer at 5:00 p.m. New York City time on the third (3rd) Business Day preceding such
      Redemption Date.

    

    

    “Treasury Rate” means, with respect to any Redemption Date, (1) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently
      published statistical release designated “H.15” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted
      to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue (if no maturity is within three months before or after the Stated Maturity of the Securities to be redeemed, yields
      for the two published maturities most closely corresponding to the Comparable Treasury Issue will be determined and the Treasury Rate shall be interpolated or extrapolated from such yields on a straight line basis, rounding to the nearest month) or
      (2) if such release referred to in Clause (1) (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the
      Comparable Treasury Issue, calculated using a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date.

    

    

    If a Change of Control Triggering Event occurs with respect to Securities of this series, unless the Company has exercised its right to redeem the Securities of this series in full, the Company will
      make an offer to each Holder (the “Change of Control Offer”) of Securities of this series to repurchase any and all of such Holder’s Securities of this series at a repurchase price in cash equal to 101% of the aggregate principal amount of the
      Securities of this series repurchased plus accrued and unpaid interest, if any, thereon, to but excluding the date of repurchase (the “Change of Control Payment”). Within thirty (30) days following any Change of Control Triggering Event, the
      Company will mail (or otherwise deliver in accordance with the applicable procedures of the Depository) a notice to Holders of Securities of this series describing the transaction or transactions that constitute the Change of Control Triggering Event
      and offering to repurchase the Securities of this series on the date specified in the notice, which date will be no less than fifteen (15) days and no more than sixty (60) days from the date such notice is mailed (or otherwise delivered in accordance
      with the applicable procedures of the Depository) (the “Change of Control Payment Date”), pursuant to the procedures required hereby and described in such notice.

     

    

    
      
        


    

    The Company will 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 Securities as a result of a Change of Control Triggering Event. To the extent that the provisions of any securities laws or regulations conflict with the
      Change of Control repurchase provisions of the Securities, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under the Change of Control repurchase provisions of the
      Securities by virtue of such conflicts.

    

    

    The Company will not be required to offer to repurchase the Securities 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 repurchases on the applicable date all Securities properly tendered and not withdrawn under its offer; provided that for all purposes of the
      Securities and the Indenture, a failure by such third party to comply with the requirements of such offer and to complete such offer shall be treated as a failure by the Company to comply with its obligations to offer to purchase the Securities
      unless the Company promptly makes an offer to repurchase the Securities at 101% of the principal amount thereof plus accrued and unpaid interest, if any, thereon, to the date of repurchase, which shall be no later than thirty (30) days after the
      third party’s scheduled Change of Control Payment Date.

    

    

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

    

    

    	

          	•	
            accept or cause a third party to accept for payment all Securities properly tendered pursuant to the Change of Control Offer;

          


    

    

    	

          	•	
            deposit or cause a third party to deposit with the Paying Agent an amount equal to the Change of Control Payment in respect of all Securities properly tendered; and

          


    

    

    	

          	•	
            deliver or cause to be delivered to the Trustee the Securities properly accepted, together with an Officers’ Certificate stating the principal amount of Securities being purchased.

          


    

    

    “Below Investment Grade Rating Event” means the Securities of this series are rated below all Investment Grade Ratings by at least two of the three Rating Agencies on any date from the earlier
      of (1) the occurrence of a Change of Control and (2) public notice of the Company’s intention to effect a Change of Control, in each case until the end of the 60-day period following public notice of the occurrence of the Change of Control; provided,
      however, that if (i) during such 60-day period one or more Rating Agencies has publicly announced that it is considering the possible downgrade of such series of Securities, and (ii) a downgrade by each of the Rating Agencies that has made
      such an announcement would result in a Below Investment Grade Rating Event, then such 60-day period shall be extended for such time as the rating of such series of Securities by any such Rating Agency remains under publicly announced consideration
      for possible downgrade to a rating below an Investment Grade Rating and a downgrade by such Rating Agency to a rating below an Investment Grade Rating could cause a Below Investment Grade Rating Event. Notwithstanding the foregoing, a rating event
      otherwise arising by virtue of a particular reduction in rating will not be deemed to have occurred in respect of a particular Change of Control (and thus will not be deemed a rating event for purposes of the definition of Change of Control
      Triggering Event) if the Rating Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at the Company’s or the Trustee’s request that the reduction
      was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control has occurred at the time of the rating
      event).

     

    

    
      
        


    

    “Change of Control” means the occurrence of any of the following:  (1) direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation),
      in one or a series of related transactions, of all or substantially all of the properties or assets of the Company and its subsidiaries taken as a whole to any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) other than to the
      Company or one of its subsidiaries; or (2) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) other
      than the Company or one of its subsidiaries becomes the beneficial owner, directly or indirectly, of more than 50% of the then outstanding number of shares of the Company’s voting stock; provided, however, that (i) a transaction will
      not be deemed to involve a Change of Control if (A) the Company becomes a wholly owned subsidiary of a holding company and (B)(x) the 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 (y) immediately following that transaction no Person is the beneficial owner, directly or indirectly, of more than 50% of the voting stock of such holding
      company.  For purposes of this definition, “voting stock” of a person means capital stock of any class or kind the holders of which are ordinarily, in the absence of contingencies, entitled to vote for the election of directors (or persons
      performing similar functions) of such person, even if the right to vote has been suspended by the happening of such a contingency.

    

    

    “Change of Control Triggering Event” means the occurrence of both a Change of Control and a Below Investment Grade Rating Event

    

    

    “Fitch” means Fitch Ratings Inc. and any successor to its rating agency business

    

    

    “Investment Grade Rating” means a rating by Moody’s equal to or higher than Baa3 (or the equivalent under a successor rating category of Moody’s), a rating by S&P equal to or higher than
      BBB- (or the equivalent under any successor rating category of S&P), a rating by Fitch equal to or higher than BBB- (or the equivalent under any successor rating category of Fitch), and the equivalent investment grade credit rating from any
      replacement rating agency or rating agencies selected by the Company under the circumstances permitting the Company to select a replacement agency and in the manner for selecting a replacement agency, in each case as set forth in the definition of
      “Rating Agencies”.

    

    

    “Moody’s” means Moody’s Investors Service, Inc. and any successor to its rating agency business.

     

    

    
      
        


    

    “Rating Agencies” means (1) Moody’s, S&P and Fitch; and (2) if any or all of Moody’s, S&P or Fitch ceases to rate the Securities of this series or fails to make a rating of the
      Securities of this series publicly available for reasons outside of the Company’s control, a “nationally recognized statistical rating organization” within the meaning of Section 3(a)(62) of the Exchange Act, that the Company selects (pursuant to a
      resolution of the Company’s Board of Directors) as a replacement agency for any of Moody’s, S&P or Fitch, or all of them, as the case may be, with respect to the Securities of this series, as applicable.

    

    

    “S&P” means Standard & Poor’s Ratings Services, a Standard & Poor’s Financial Services LLC business, and any successor to its rating agency business.

    

    

    If an Event of Default with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with
      the effect provided in the Indenture.

    

    

    The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the
      Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in aggregate principal amount of the Securities at the time Outstanding of each series
      to be affected.

    

    

    The Indenture also contains provisions permitting the Holders of specified percentages in aggregate principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders
      of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences.  Any such consent or waiver by the Holder of this Security shall be
      conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is
      made upon this Security.

    

    

    No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, or the right of the Holder of this Security, which is
      absolute and unconditional, to pay, or, in the case of the Holder of this Security, to receive payment of, the principal of (and premium, if any) and interest on this Security at the times, place and rate, and in the coin or currency, herein
      prescribed.

    

    

    As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for
      registration of transfer at the Corporate Trust Office of the Trustee or the Paying Agent’s office where the principal of (and premium, if any) and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of
      transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or such Holder’s attorney duly authorized in writing; and thereupon one or more new Securities of this series and of like tenor, of authorized
      denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

    

    

    The Securities of this series are issuable only in fully registered form, without coupons, in denominations of $2,000 and multiples of $1,000 in excess thereof. As provided in the Indenture and
      subject to certain limitations therein set forth, Securities of this series are exchangeable for other Securities of this series, of a like tenor and aggregate principal amount but of a different authorized denomination, as requested by the Holder
      surrendering the same.

     

    

    
      
        


    

    No service charge shall be made for any such registration of transfer or exchange, but the Company or the Trustee may require payment of a sum sufficient to cover any tax or other governmental charge
      that may be imposed in connection with any registration of transfer or exchange of Securities, other than exchanges pursuant to Sections 3.04, 9.06 or 11.07 of the Base Indenture not involving any transfer.

    

    

    Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is
      registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

    

    

    The Indenture provides that the Company, at the Company’s option, (a) will be discharged from any and all obligations in respect of the Securities (except for certain obligations to register the
      transfer or exchange of Securities, replace stolen, lost or mutilated Securities, maintain paying agencies and hold moneys for payment in trust) or (b) need not comply with certain restrictive covenants of the Indenture, in each case if the Company
      deposits, in trust with the Trustee, money, or U.S. Government Obligations which through the payment of interest thereon and principal thereof in accordance with their terms will provide money, in an amount sufficient to pay all the principal
      (including any mandatory sinking fund payments) of (and premium, if any) or interest on the Securities on the dates such payments are due in accordance with the terms of such Securities, and certain other conditions are satisfied.

    

    

    No recourse shall be had for the payment of the principal of or premium, if any, or interest, if any, on this Security, or for any claim based hereon, or otherwise in respect hereof, or based on or
      in respect of the Indenture or any indenture supplemental thereto, against any incorporator, or against any past, present or future stockholder, officer, director, employee, or agent, as such, of the Company or of any successor Person thereof,
      whether by virtue of any law, statute or constitutional provision, or by the enforcement of any assessment or by any legal or equitable proceeding or otherwise, all such liability being expressly waived and released as a condition of, and as
      consideration for, the execution of this Indenture and the issue of the Securities.

    

    

    If and to the extent that any provision of this Security limits, qualifies or conflicts with a provision of the Indenture, such provision of the Indenture shall control.

    

    

    All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

    

    

    
      
        


    

    ASSIGNMENT FORM

    

    

    	
            I or we assign and transfer this Security to:

          	 	 


    

    

    	
            Insert social security or other identifying number of assignee

          
	 	 
	 	 
	 	 
	
            Print or type name, address and zip code of assignee

          
	 	 
	 	 
	 	 
	 	 


    

    

    and irrevocably appoint                                              , as agent, to transfer this Security on the books of the Company.

    

    

    The agent may substitute another to act for him.

    

    

    	
            Date:

          	 	 


    

    

    	 	
            Signed:

          	 	 
	 	
            (Sign exactly as name appears on the other side of this Security)

          	 


    

    

    Signature Guarantee*:

    	*	
            Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other
              “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

          


    

    

    
      
        


    

    [TO BE ATTACHED TO GLOBAL NOTES]

    

    

    SCHEDULE OF INCREASES OR DECREASES IN GLOBAL NOTE

    

    

    The following increases or decreases in this Global Note have been made:

     

    

    	
            
              Date of Exchange

            

          	 	
            
              Amount of

              decrease in

              principal amount

              of this Global

              Note

            

          	 	
            
              Amount of

              increase in

              principal amount

              of this Global

              Note

            

          	 	
            
              Principal amount

              of this Global

              Note following

              such decrease or

              increase

            

          	 	
            
              Signature of

              authorized officer

              of Trustee or 

              

              Notes Custodian