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Exhibit 32.1

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CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

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The undersigned hereby certifies, for the purposes of Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Zynex, Inc. (“Zynex”), that to his knowledge:

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1.

This Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.

The information contained in such Report fairly presents, in all material respects, the financial condition and results of operations of Zynex for the period covered by this Report.

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Dated: July 24, 2025

/s/ Thomas Sandgaard

    

Thomas Sandgaard

Chairman, President, Chief Executive Officer and Principal Executive Officer

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