INDEX OF DEFINED TERMS Term Page 10-Year Fixed Rate Notes 8 18-Month Floating Rate Notes 7 20-Year Fixed Rate Note 8 2-Year Fixed Rate Notes 7 30-Year Fixed Rate Notes 8 3-Year Fixed Rate Notes 8 3-Year Floating Rate Notes 8 5-Year Fixed Rate Notes 8 5-Year Floating Rate Notes 8 7-Year Fixed Rate Notes 8 Account Control Agreement 31 Acquisition 1 Additional Senior Notes 9 Adjustments 14 Agent Members 16 Alternative Rate 14 Applicable Procedures 2 Base Indenture 1, B-1 Below Investment Grade Rating Event 26 Business Day 2 Calculation Agent 12 Change of Control 27 Change of Control Offer 25 Change of Control Payment 25 Change of Control Payment Date 25 Change of Control Triggering Event 27 Cigna 2 Clearstream 2 Collateral Default 35 Company 1, A-0, X-0 Comparable Treasury Issue 29 Comparable Treasury Price 29 Covenant Defeasance 40 Daily Interest Amount 14 Definitive Note 2 Depository 2 Designated Subsidiary 2 Domestic Subsidiary 2 Euroclear 2 Event of Default 34 Exchange Act 25 Exchange Notes 2 Express Scripts 2 First Supplemental Indenture B-1 Fitch 27 Fixed Rate Make Whole Redemption Price 28 Fixed Rate Notes 8 Floating Rate Interest Payment Date 12 Floating Rate Notes 8 Gxxxxxxxx 00, X-0 Guarantee Release Condition 42 Guarantor B-0 Xxxxxxxxxx 0, X-0 IFA 14 Indenture 1, B-1 Independent Investment Banker 29 Initial Notes 2 Interest Determination Date 13 Interest Payment Date 3 Interest Reset Date 12 Investment Grade Rating 27 LIBOR Alternative Rate Provision 14 LIBOR Event 14 London Business Day 13 Make-Whole Basis Points 29 Mandatorily Redeemable Notes 3 Mxxxx'x 28 nationally recognized statistical rating organization 28 Notes Custodian 3 Notice of Default 34 Offering Memorandum 3 Par Call 28 Par Call Date 29 Permitted Investments 32 person 27 Pledged Property 31 Primary Treasury Dealer 30 Purchase Agreement 3 QIB 3 Qualified Institutional Buyer 3 Rating Agencies 28 Record Date 3 Redemption Exclusive Control Trigger Event 32 Reference Treasury Dealer 30 Reference Treasury Dealer Quotations 30 Registered Exchange Offer 3 Registration Rights Agreement 3 Regular Record Date 11 Regulation S 3 Regulation S Global Note 15 Regulation S Notes 3 Required Merger 32 Restricted Notes Legend 2, 3 Restricted Period 4 Rule 144 4 Rule 144A 4 Rule 144A Global Note 15 Rule 144A Notes 4 S&P 28 Securities Act 4, A-1 Security Agreement 4 Segregated Collateral Accounts 31 Senior Notes 8 Special Mandatory Redemption 30 Special Mandatory Redemption Date 31 Special Mandatory Redemption Price 31 Special Mandatory Redemption Trigger Date 30 Stated Maturity 4 Supplemental Indenture 1, B-1 Transfer Restricted Note 4 Treasury Rate 30 Trigger Date 4 Trustee 1 Use of Proceeds Exclusive Control Trigger Event 32 voting stock 27