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Russian Foreign Ministry spokeswoman Maria Zakharova called it "the height of fakery" and posted a video of Lavrov sitting outdoors dressed in shorts and a T-shirt and reading documents.
However, Bali Governor I Wayan Koster told Reuters Lavrov had briefly visited a local hospital for a "check-up", and the Russian was in good health.
Indonesian officials declined to comment.
Lavrov is representing Putin at the G20 summit - the first since Russia invaded Ukraine in February - after the Kremlin said Putin was too busy to attend.
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TENSE TIES
U.S.-China telations have been roiled in recent years by growing tensions over issues ranging from Hong Kong and Taiwan to the South China Sea, trade practices and U.S. restrictions on Chinese technology.
But U.S. officials said there have been quiet efforts by both Beijing and Washington over the past two months to repair ties.
U.S. Treasury Secretary Janet Yellen told reporters in Bali earlier that the meeting was "intended to stabilise the relationship between the United States and China, and to create a more certain atmosphere for U.S. businesses".
She said that Biden had been clear with China about national security concerns regarding restrictions on sensitive U.S. technologies and had raised concern about the reliability of Chinese supply chains for commodities like minerals.
Biden and Xi, who have held five phone or video calls since Biden became president in January 2021, last met in person during the Obama administration when Biden was vice president.
G20 summit host President Joko Widodo of Indonesia said he hoped the gathering on Tuesday could "deliver concrete partnerships that can help the world in its economic recovery".
However, one of the main topics at the G20 will be Russia's war in Ukraine and Biden will be "unapologetic" in his defence of the European nation, U.S. officials said last week.
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Xi and Putin have grown increasingly close in recent years, bound by their shared distrust of the West, and reaffirmed their partnership just days before Russia invaded Ukraine. But China has been careful not to provide any direct material support that could trigger Western sanctions against it.
Chinese Premier Li Keqiang emphasised the "irresponsibility" of nuclear threats during the summit in Cambodia, suggesting China was uncomfortable with strategic partner Russia's nuclear rhetoric, the Biden administration official said.
The West has accused Russia of making irresponsible statements on the possible use of nuclear weapons since its February invasion of Ukraine. Russia has in turn accused the West of "provocative" nuclear rhetoric.
Russia's Lavrov said on Sunday the West was "militarising" Southeast Asia in a bid to contain Russian and Chinese interests.
Ukrainian President Volodymyr Zelenskiy has said he would address the G20 by videolink on Tuesday.
