Earlier in the day, Kosiniak-Kamysz said he expected to visit the United States early next week "if everything goes well."
The meeting at the Pentagon is scheduled for 10:30 a.m. local time.
"We will be at the Pentagon and will talk about bases, the presence of US troops and the Polish-American alliance," Kosiniak-Kamysz said.
Last week, the Polish defencee minister said there were no problems agreeing on a date for his visit to the United States, but that he was withholding possible dates as a precaution.
He said the caution stemmed from his experience in September, when his meeting with Hegseth was cancelled at the last minute because Chinese President Xi Jinping was visiting the United States.
Kosiniak-Kamysz is due to meet Hegseth a week after the US midterm elections, in which President Donald Trump's Republicans lost their majorities in both chambers of Congress.
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Source: IAR/PAP