Exhibit 32.02

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350

The undersigned, Jereme M. Sylvain, Executive Vice President and Chief Financial Officer of DexCom, Inc. (the “Company”), pursuant to 18 U.S.C. §1350, hereby certifies that:

(i) the quarterly Report on Form 10-Q for the period ended June 30, 2023 of the Company (the “Report”) fully complies with the requirements of Section 13(a) or 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 27, 2023

/s/ JEREME M. SYLVAIN

Jereme M. Sylvain

Executive Vice President and Chief Financial Officer

(Principal Financial and Accounting Officer)