The grasscourt Grand Slam was scheduled to start on Monday but was cancelled for the first time since World War Two in April.
The All England Lawn Tennis Club (AELTC) said its spending plans would not have to be curtailed.
"It won't be severely impacted. If you have to cancel, it's great to have insurance," Lewis, who will step down as the CEO next month, told British media.
"We're still in a very good position, we're financially very stable. British tennis is going to be pretty well protected."
However, Wimbledon would not have similar insurance cover in place next year, he added.
"That's impossible in the current climate," he said. "When I started in 2012, there were some signs that things were not insurable, because of communicable diseases that had taken place, like Sars and swine flu.
"In the immediate aftermath you can't get insurance but fairly soon after that you can start to get insurance again, the market returns. So there won't be insurance next year.
"But just because we've made one claim, it won't affect us in the long term."
The U.S. Open is going ahead as scheduled from the end of August while the French Open has moved to the end of September from May and Sally Bolton, who will succeed Lewis, said the AELTC would learn all they can from the tournaments.
"We've got the U.S. Open and Roland Garros being staged later this year and we will be looking closely at what they do, working with the constraints they find themselves under and learning what we can," said Bolton.