Health insurance is an insurance that covers the whole or a part of the risk of a person incurring medical expenses, spreading the risk over numerous persons.
Mr Obama said Democrats risked alienating voters if they lurched too far to The Left politically.
The former president, speaking at a fundraising event, said most voters didn't want to "tear down The System ".
Mr Obama is yet to publicly back a Democratic candidate.
At The Event held in Washington on Friday, Mr Obama did not mention any candidate by name nor criticise any specific policy proposal.
Instead, he used the appearance to urge Democrats to "pay some attention" to voters on issues such as health care and immigration.
These voters, Mr Obama said, did not necessarily have the same views as what he called "certain left-leaning Twitter feeds" or "The Activist wing of our party".
The comments, which come less than four months before the Democratic primaries, represent one of Mr Obama's most pointed interventions in the race so far.
But Mr Obama, who occupied the White House from 2009 to 2017, said the country was "less revolutionary than it is interested in improvement".
"Even as we push the envelope and we are bold in our vision, we also have to be rooted in reality," Mr Obama said at The Meeting , reportedly attended by wealthy liberal donors.Barack Obama , pictured here with Joe Biden after giving his election victory speech in 2008, is viewed as a moderate Democrat
The Democratic race is still largely up in the air even as The First of the state-by-state votes that will decide which of The Contenders challenges Mr Trump for the White House looms in Iowa in February.
Some Democrats are concerned that Mr Biden, a moderate, will struggle to beat Mr Trump, prompting a flurry of latecomers to join the race.
Meanwhile, political gossip about whether Hillary Clinton might enter The Fray continues to set tongues wagging in Washington DC.
In an interview with the BBC, Mrs Clinton said she was "under enormous pressure" to challenge Mr Trump, who beat her in the 2016 presidential election.Who will take on Trump in 2020?