NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

NOTE A – BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of Boston Scientific Corporation have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for fair presentation have been included. Operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to the consolidated financial statements and footnotes thereto included in Item 8 of our most recent Annual Report on Form 10-K.

Amounts reported in millions within this report are computed based on the amounts in thousands. As a result, the sum of the components reported in millions may not equal the total amount reported in millions due to rounding. Certain columns and rows within tables may not add due to the use of rounded numbers. Percentages presented are calculated from the underlying numbers in dollars. Prior year balances were subject to rounding.

Revision of Reportable Segments

Effective January 1, 2018, following organizational changes to align the company's business and organization structure focused on active implantable devices, we revised our reportable segments, in accordance with FASB ASC Topic 280, Segment Reporting. The revision reflects a reclassification of our Neuromodulation business from our Medical Surgical (MedSurg) segment to our newly created Rhythm and Neuro segment. We have revised prior year amounts to conform to the current year’s presentation (as denoted with an asterisk throughout *). There was no revision to operating segments or reporting units as a result of the organizational change. See Note C – Goodwill and Other Intangible Assets and Note K – Segment Reporting for further details.

Subsequent Events

We evaluate events occurring after the date of our most recent accompanying unaudited condensed consolidated balance sheets for potential recognition or disclosure in our financial statements. We did not identify any material subsequent events requiring adjustment to our accompanying unaudited condensed consolidated financial statements (recognized subsequent events) for the three months ended March 31, 2018 . Those items requiring disclosure (unrecognized subsequent events) in the financial statements have been disclosed accordingly. Refer to Note B – Acquisitions and Strategic Investments and Note I – Commitments and Contingencies for more information.

Accounting Standards Implemented Since December 31, 2017

ASC Update No. 2014-09

In May 2014, the FASB issued ASC Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was subsequently updated. We adopted the standard as of January 1, 2018, using the modified retrospective method. Under this method, we applied FASB ASC Topic 606 to contracts that were not complete as of January 1, 2018 and recognized the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings. Results for reporting periods beginning after January 1, 2018 are presented in accordance with FASB ASC Topic 606. Prior period amounts are not adjusted and are reported in accordance with legacy GAAP requirements in FASB ASC Topic 605, Revenue Recognition .

Due to the adoption of FASB ASC Topic 606, we recorded a net reduction to opening retained earnings of $177 million on January 1, 2018, primarily related to cost of providing non-contractual post-implant support to certain customers, which we deemed immaterial in the context of the arrangement. Upon the adoption of FASB ASC Topic 606, when we sell a device with an implied non-contractual post-implant support obligation, we forward accrue the cost of the service within Selling, general and administrative expenses and recognize it at the point in time the associated revenue is earned. We release the accrual over the related service period. These costs were previously expensed as incurred due to such service obligation being non-contractual.

The impact of adopting FASB ASC Topic 606 on our unaudited condensed consolidated balance sheets as of March 31, 2018 , resulted in an increase in Other current liabilities of $59 million and an increase in Other long-term liabilities of $206 million , as a result of accruing for our post-implant support obligation. We also recorded deferred tax assets primarily related to post-implant support, resulting in an increase in Other long-term assets of $12 million and a reduction in Deferred income taxes of

$41 million . The remaining impact of adopting FASB ASC Topic 606 was not material to our financial position or results of operations.

Refer to Note L – Revenue for additional details.

ASC Update No. 2016-01

In January 2016, the FASB issued ASC Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) : Recognition and Measurement of Financial Assets and Financial Liabilities. The purpose of Update No. 2016-01 is to improve financial reporting for financial instruments by reducing the number of items recorded to other comprehensive income. We adopted Update No. 2016-01 in the first quarter of 2018, using both the modified retrospective and prospective methods. For publicly-held securities, we used the modified retrospective approach. Unrealized gains and losses previously recorded to other comprehensive income were reclassified to retained earnings and all future fair value changes will be recorded to net income. For privately-held securities, we elected the measurement alternative approach which is applied prospectively upon adoption. This approach requires entities to measure their investments at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The adoption of the standard did not have a material impact on our financial position or results of operations. The actual impact to future periods resulting from fair value changes of our equity investments is difficult to predict as it will depend on their future performance.

ASC Update No. 2016-16

In October 2016, the FASB issued ASC Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory . The purpose of Update No. 2016-16 is to allow an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, as opposed to waiting until the asset is sold to a third party, or impaired. Update No. 2016-16 was effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. We adopted Update No. 2016-16 prospectively in the first quarter of 2018 and recognized a net reduction to opening retained earnings of $55 million for income tax consequences not previously recognized for intra-entity transfers of assets other than inventories. All future income tax consequences of intra-entity transfers of assets other than inventories will be recognized through income tax expense.

ASC Update No. 2017-12

In August 2017, the FASB issued ASC Update No. 2017-12, Derivatives and Hedging (Topic 815) : Targeted Improvements to Accounting for Hedging Activities . The purpose of Update No. 2017-12 is to simplify the application of hedge accounting and better align financial reporting of hedging relationships with risk management objectives. Update No. 2017-12 was effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods. We early adopted Update No. 2017-12 in the first quarter of 2018. The adoption of the standard had no impact on our financial position or results of operations.

NOTE B – ACQUISITIONS AND STRATEGIC INVESTMENTS

We did not close any material acquisitions during the first quarter of 2018 or 2017 .

On April 30, 2018, we announced the closing of our acquisition of NxThera, Inc. (NxThera), a privately-held company based in Maple Grove, Minnesota. NxThera developed the Rezûm ^® System, a minimally invasive therapy in a growing category of treatment options for patients with benign prostatic hyperplasia (BPH). The transaction consists of an upfront cash payment of $306 million , and up to an additional $100 million in potential commercial milestone payments over the next four years. We have an existing minority investment in NxThera which is expected to result in a net upfront payment of approximately $240 million upon closing, and milestone payments of up to $85 million . NxThera will be integrated into our Urology and Pelvic Health business.

On April 16, 2018, we announced the closing of our acquisition of nVision Medical Corporation (nVision), a privately-held company focused on women’s health. nVision developed the first and only device cleared by the U.S. Food and Drug Administration (FDA) to collect cells from the fallopian tubes, offering a potential platform for earlier diagnosis of ovarian cancer. The transaction consists of an upfront cash payment of $150 million , and up to an additional $125 million in potential clinical and commercial milestones over four years. nVision will be integrated into our Urology and Pelvic Health business.

As of March 31, 2018 , the maximum amount of future contingent consideration (undiscounted) that we could be required to pay was approximately $1.320 billion .

The recurring Level 3 fair value measurements of our contingent consideration liabilities include the following significant unobservable inputs:

Projected contingent payment amounts related to some of our R&D, commercialization-based and revenue-based milestones are discounted back to the current period using a discounted cash flow (DCF) model. Projected revenues are based on our most recent internal operational budgets and long-range strategic plans. Increases in projected revenues and probabilities of payment may result in higher fair value measurements. Increases in discount rates and the time to payment may result in lower fair value measurements. Increases or decreases in any of those inputs together, or in isolation, may result in a significantly lower or higher fair value measurement.

Strategic Investments

On January 24, 2018, we closed an investment and entered into an acquisition option agreement with Millipede, Inc. (Millipede), a privately-held company that has developed the IRIS Transcatheter Annuloplasty Ring System for the treatment of severe mitral regurgitation. Under the terms of the agreements, we have purchased a portion of the outstanding shares of Millipede along with newly issued shares of the company for a total consideration of $90 million . We also have the option to acquire the remaining shares of the company at any time prior to the completion of a first in human clinical study that meets certain parameters. Upon the completion of the clinical study, Millipede has the option to compel us to acquire the remaining shares of the company. Each company’s option period expires by the end of 2019. Completion of this acquisition would result in an additional $325 million payment by us at closing with a further $125 million becoming payable upon achievement of a commercial milestone.

The aggregate carrying amount of our strategic investments were comprised of the following categories:

		As of
(in millions)		March 31, 2018				December 31, 2017
Equity method investments		$	304			$	209
Measurement alternative investments		84				81
Publicly-held securities		12				15
Notes receivable		43				47
		$	442			$	353

These investments are classified as other long-term assets within our accompanying unaudited condensed consolidated balance sheets , in accordance with U.S. GAAP and our accounting policies.

As of March 31, 2018 , the book value of our equity method investments exceeded our share of the book value of the investees’ underlying net assets by approximately $335 million , which represents amortizable intangible assets and in-process research and development, corresponding deferred tax liabilities and goodwill.

The following represents our goodwill balance by global reportable segment:

We did not have any goodwill impairments in the three months ended March 31, 2018 or 2017 . We test our goodwill balances during the second quarter of each year for impairment, or more frequently if indicators are present or changes in circumstances suggest that impairment may exist. We assess goodwill for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment, referred to as a component. We have seven reporting units: Endoscopy, Urology and Pelvic Health, Cardiac Rhythm Management, Electrophysiology, Neuromodulation, Interventional Cardiology and Peripheral Interventions. As such, the first quarter change in our reportable segments, where Neuromodulation was reclassified from our MedSurg segment to our newly created Rhythm and Neuro segment did not trigger a goodwill impairment assessment or impact our total goodwill carrying value.

NOTE D – HEDGING ACTIVITIES AND FAIR VALUE MEASUREMENTS

Derivative Instruments and Hedging Activities

We address market risk from changes in foreign currency exchange rates and interest rates through risk management programs which include the use of derivative financial instruments. We operate these programs pursuant to documented corporate risk management policies and do not enter into derivative transactions for speculative purposes. Our derivative instruments do not subject our earnings or cash flows to material risk, as the gains or losses on these derivatives generally offset losses or gains recognized on the hedged item.

We manage concentration of counterparty credit risk by limiting acceptable counterparties to major financial institutions with investment grade credit ratings, limiting the amount of credit exposure to individual counterparties and by actively monitoring counterparty credit ratings and the amount of individual credit exposure. We also employ master netting arrangements that limit the risk of counterparty non-payment on a particular settlement date to the net gain that would have otherwise been received from the counterparty. Although not completely eliminated, we do not consider the risk of counterparty default to be significant as a result of these protections. Further, none of our derivative instruments are subject to collateral or other security arrangements, nor do they contain provisions that are dependent on our credit ratings from any credit rating agency.

Our risk from changes in currency exchange rates consists primarily of monetary assets and liabilities, forecast intercompany and third-party transactions and net investments in certain subsidiaries. We manage currency exchange rate risk at a consolidated level to reduce the cost of hedging by taking advantage of offsetting transactions. We employ derivative instruments, primarily forward currency contracts, to reduce the risk to our earnings and cash flows associated with changes in currency exchange rates.

The success of our currency risk management program depends, in part, on forecast transactions denominated primarily in British pound sterling, Euro and Japanese yen. We may experience unanticipated currency exchange gains or losses to the extent the actual activity is different than forecast. In addition, changes in currency exchange rates related to any unhedged transactions may impact our earnings and cash flows.

Certain of our currency derivative instruments are designated as cash flow hedges under FASB ASC Topic 815 , Derivatives and Hedging and are intended to protect the U.S. dollar value of forecasted transactions. The gain or loss on a derivative instrument designated as a cash flow hedge is recorded in other comprehensive income (OCI) and is included in the Accumulated other comprehensive income (loss), net of tax (AOCI) caption of our unaudited condensed consolidated balance sheets until the underlying third-party transaction occurs. When the related third-party transaction occurs we recognize the gain or loss to earnings within the Cost of products sold caption of our unaudited condensed consolidated statements of operations . In the event the hedging relationship is no longer effective, or if the hedged forecast transaction becomes no longer probable of occurring, we reclassify the amount of gains or losses on the derivative instrument designated as a cash flow hedge to earnings at that time.

We also use forward currency contracts that are not part of designated hedging relationships under FASB ASC Topic 815 as a part of our strategy to manage our exposure to currency exchange rate risk related to monetary assets and liabilities and related forecast transactions. These non-designated currency forward contracts have an original time to maturity consistent with the hedged currency transaction exposures, generally less than one year, and are marked-to-market with changes in fair value recorded to earnings and reflected within the Other, net caption of our unaudited condensed consolidated statements of operations .

Our interest rate risk relates primarily to U.S. dollar borrowings partially offset by U.S. dollar cash investments. We use interest rate derivative instruments to manage our earnings and cash flow exposure to changes in interest rates. Under these agreements we and the counterparty, at specified intervals, exchange the difference between fixed and floating interest amounts calculated by reference to an agreed-upon notional principal amount. We designate these derivative instruments either as fair value or cash flow hedges under FASB ASC Topic 815 .

The changes in the fair value of interest rate derivatives designated as fair value hedges and the changes in the fair value of the underlying hedged debt instrument generally offset and are recorded within the Interest expense caption of our unaudited condensed consolidated statements of operations . We record the changes in the fair value of interest rate derivatives designated as cash flow hedges within OCI and is included within the AOCI caption of our unaudited condensed consolidated balance sheets until the underlying hedged transaction occurs, at which time we recognize the gain or loss within Interest expense . In the event the hedging relationship is no longer effective, or if the hedged forecast transaction becomes no longer probable of occurring, we reclassify the amount of gains or losses on the interest rate derivative designated as a cash flow hedge to earnings at that time.

We are amortizing the realized gains or losses from interest rate derivative instruments previously designated as fair value or cash flow hedges into earnings as a component of Interest expense over the remaining term of the hedged item in accordance with FASB ASC Topic 815 , so long as the hedge relationship remains effective. Prior to the adoption of ASC Update No. 2017-12, Derivatives and Hedging (Topic 815), the ineffective portion, if any, of our interest rate derivatives designated as either fair value or cash flow hedges was recognized in earnings in the period in which the hedging relationship exhibited ineffectiveness.

The following table presents the contractual amounts of our derivative instruments outstanding:

The remaining time to maturity as of March 31, 2018 is within 60  months for all designated forward currency contracts and generally less than one year for all non-designated forward currency contracts.

We had no interest rate derivative instruments outstanding as of March 31, 2018 and December 31, 2017 .

The following presents the effect of our derivative instruments designated as cash flow hedges under FASB ASC Topic 815 on our accompanying unaudited condensed consolidated statements of operations :

As of March 31, 2018 , pre-tax net gains or losses for our derivative instruments designated, or previously designated, as currency hedge contracts under FASB ASC Topic 815 that may be reclassified to earnings within the next twelve months are presented below:

Net gains and losses on currency hedge contracts not designated as hedging instruments offset by net gains and losses from currency transaction exposures are presented below:

Fair Value Measurements

FASB ASC Topic 815 requires all derivative instruments to be recognized at their fair values as either assets or liabilities on the balance sheet. We determine the fair value of our derivative instruments using the framework prescribed by FASB ASC Topic 820, Fair Value Measurements and Disclosures , by considering the estimated amount we would receive or pay to transfer these instruments at the reporting date when taking into account current currency exchange rates, interest rates, the creditworthiness of the counterparty for unrealized gain positions and our own creditworthiness for unrealized loss positions. In certain instances, we may utilize financial models to measure fair value of our derivative instruments. In doing so, we use inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability and inputs derived principally from, or corroborated by, observable market data by correlation or other means.

The following are the balances of our derivative assets and liabilities:

Recurring Fair Value Measurements

On a recurring basis, we measure certain financial assets and financial liabilities at fair value based upon quoted market prices. Where quoted market prices or other observable inputs are not available, we apply valuation techniques to estimate fair value. FASB ASC Topic 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The category of a financial asset or a financial liability within the valuation hierarchy is based upon the lowest level of input that is significant to the measurement of fair value. The three levels of the hierarchy are defined as follows:

Assets and liabilities measured at fair value on a recurring basis consist of the following:

Our investments in money market and government funds are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices. These investments are classified as cash and cash equivalents within our accompanying unaudited condensed consolidated balance sheets , in accordance with U.S. GAAP and our accounting policies. In addition to $42 million invested in money market and government funds as of March 31, 2018 , we had $245 million in interest bearing and non-interest bearing bank accounts. In addition to $21 million invested in money market and government funds as of December 31, 2017 , we had $167 million in interest bearing and non-interest bearing bank accounts.

Our recurring fair value measurements using significant unobservable inputs (Level 3) relate solely to our contingent consideration liability. Refer to Note B – Acquisitions and Strategic Investments for a discussion of the changes in the fair value of our contingent consideration liability.

Non-Recurring Fair Value Measurements

We hold certain assets and liabilities that are measured at fair value on a non-recurring basis in periods subsequent to initial recognition. The fair value of a measurement alternative investment is not estimated if there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value of the investment. Refer to Note B – Acquisitions and Strategic Investments for a discussion of our strategic investments.

Refer to Note C – Goodwill and Other Intangible Assets for a discussion of the fair values and annual impairment tests of goodwill and our indefinite lived intangible assets.

The fair value of our outstanding debt obligations was $6.040 billion as of March 31, 2018 and $5.945 billion as of December 31, 2017 . We determined fair value by using quoted market prices for our publicly registered senior notes, classified as Level 1 within the fair value hierarchy, amortized cost for commercial paper and face value for term loans and credit facility borrowings outstanding. Refer to Note E – Borrowings and Credit Arrangements for a discussion of our debt obligations.

^† As of December 31, 2017 , $600 million under the October 2018 Notes was outstanding and classified as short-term debt.

The 2017 Facility provides for an exclusion from the calculation of consolidated EBITDA, as defined by the agreement, through maturity, of any non-cash charges and up to $500 million in restructuring charges and restructuring-related expenses related to our current or future restructuring plans. As of March 31, 2018 , we had $415 million of the restructuring charge exclusion remaining. In addition, any cash litigation payments (net of any cash litigation receipts), as defined by the 2017 Facility, are excluded from the calculation of consolidated EBITDA, as defined in the 2017 Facility, provided that the sum of any excluded net cash litigation payments does not exceed $2.624 billion in the aggregate. As of March 31, 2018 , we had $1.690 billion of the legal exclusion remaining.

Any inability to maintain compliance with these covenants could require us to seek to renegotiate the terms of our credit facility or seek waivers from compliance with these covenants, both of which could result in additional borrowing costs. Further, there can be no assurance that our lenders would agree to such new terms or grant such waivers on terms acceptable to us. In this case, all credit facility commitments would terminate and any amounts borrowed under the facility would become immediately due and payable. Furthermore, any termination of our credit facility may negatively impact the credit ratings assigned to our commercial paper program which may impact our ability to refinance any then outstanding commercial paper as it becomes due and payable.

Commercial Paper

As of March 31, 2018 , we had $886 million of commercial paper outstanding and $1.197 billion outstanding as of December 31, 2017 . Our commercial paper program is backed by the 2017 Facility, which allows us to have a maximum of $2.250 billion in commercial paper outstanding. Outstanding commercial paper directly reduces borrowing capacity available under the 2017 Facility . As of March 31, 2018 , the commercial paper issued and outstanding had a weighted average maturity of 22 days and a weighted average yield of 2.46 percent . As of December 31, 2017 , the commercial paper issued and outstanding had a weighted average maturity of 38 days and a weighted average yield of 1.85 percent .

Senior Notes

We had senior notes outstanding of $4.800 billion as of March 31, 2018 and $4.400 billion as of December 31, 2017 .

In February 2018, we completed an offering of   $1.000 billion in aggregate principal amount of 4.000% senior notes, due March 2028. We used a portion of the net proceeds from the offering to repay the $600 million plus accrued interest of our 2.650% senior notes due in October 2018. The remaining proceeds were used to repay a portion of our outstanding commercial paper.

Our senior notes were issued in public offerings, are redeemable prior to maturity and are not subject to sinking fund requirements. Our senior notes are unsecured, unsubordinated obligations and rank on parity with each other. These notes are effectively junior to borrowings under our credit and security facility, and to the extent borrowed by our subsidiaries, to liabilities of our subsidiaries (see Other Arrangements below).

Other Arrangements

As of March 31, 2018 and December 31, 2017 , we maintained a $400 million credit and security facility secured by our U.S. trade receivables maturing in February 2019. We had outstanding borrowings of $70 million as of March 31, 2018 and no outstanding borrowings as of December 31, 2017 under our credit and security facility.

We have accounts receivable factoring programs in certain European countries that we account for as sales under FASB ASC Topic 860, Transfers and Servicing . These agreements provide for the sale of accounts receivable to third parties, of up to approximately $463 million as of March 31, 2018 . We have no retained interests in the transferred receivables, other than collection and administrative responsibilities and, once sold, the accounts receivable are no longer available to satisfy creditors in the event of bankruptcy. We de-recognized $178 million of receivables as of March 31, 2018 at an average interest rate of 2.1 percent and $171 million as of December 31, 2017 at an average interest rate of 1.8 percent .

In March 2018, we entered into a factoring agreement with a commercial Japanese bank. The agreement provides for the sale of accounts receivable and promissory notes of up to 30.000 billion Japanese yen (approximately $282 million as of March 31, 2018 ). We have no retained interests in the transferred receivables, other than collection and administrative responsibilities and, once sold, the accounts receivable are no longer available to satisfy creditors in the event of bankruptcy. We de-recognized $95 million of receivables as of March 31, 2018 at an average interest rate of 0.5 percent .

In addition, we have uncommitted credit facilities with a commercial Japanese bank that provide for accounts receivable factoring and promissory notes discounting of up to 22.000 billion Japanese yen (approximately $207 million as of March 31, 2018 ). We have no retained interests in the transferred receivables, other than collection and administrative responsibilities and, once sold, the accounts receivable are no longer available to satisfy creditors in the event of bankruptcy. We de-recognized $124 million of notes receivable as of March 31, 2018 at an average interest rate of 1.5 percent and $157 million of notes receivable as of December 31, 2017 at an average interest rate of 1.3 percent . De-recognized accounts and notes receivable are excluded from trade accounts receivable, net in the accompanying unaudited condensed consolidated balance sheets .