US STOCKS-Wall St lifted by muscular oil rally but some still skittish
* U.S. crude rises more than 6 percent
* Energy top gainer among S&P sectors
* Health insurers up; govt proposes hiking Medicare payments
* Indexes up: Dow 1.39 pct, S&P 1.45 pct, Nasdaq 1.47 pct (Updates to close)
By Noel Randewich
Feb 22 (Reuters) - Wall Street surged on Monday, helped by a robust rally in oil prices that lifted recently crushed energy stocks, including Chevron and Schlumberger.
As it has for months, Wall Street followed the lead of global oil prices in a trend that has left the S&P 500 down 5 percent so far in 2016, following a partial recovery last week.
Monday's stock gains were as broad as they were strong, with all 10 major S&P sectors finishing higher, but investors shell-shocked by this year's market turbulence remained wary.
"You still have concerns about China and where growth goes there, and that's why you're still going to have this volatility," said Kurt Brunner, portfolio manager at Swarthmore Group in Philadelphia. "We're still going to have considerations about heavily indebted energy companies going into default." Continuación...