DexCom (DXCM) 10-Q 2019 Q2 Quarterly report

Exhibit 32.02

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350

The undersigned, Quentin S. Blackford, Chief Financial Officer of DexCom, Inc. (the “Company”), pursuant to 18 U.S.C. §1350, hereby certifies:

(i) the quarterly Report on Form 10-Q for the period ended June 30, 2019 of the Company (the “Report”) fully complies with the requirements of Section 13(a) and 15(d) of the Securities Exchange Act of 1934; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: July 31, 2019

/s/ Quentin S. Blackford

Quentin S. Blackford

Executive Vice President and Chief Financial Officer

(Principal Financial and Accounting Officer)