The star goaltender suffered a head injury late in the opening period of the Islanders' 5-3 loss to the Montreal Canadiens on Tuesday night. DiPietro was taken to a hospital and released, and coach Ted Nolan said the team would have no further information until the medical staff reviewed test results.
"He was a little bit groggy," Nolan said. "That was quite a hit that he took, but he seems to be OK right now, but we'll give it 24 hours. We'll get him re-evaluated by our doctors and go from there."
DiPietro left with 4:19 remaining in the opening period after he collided with Canadiens forward Steve Begin. DiPietro was chasing down a loose puck at the Islanders blue line to prevent a breakaway when Begin's leg hit the goalie in the head.
The Islanders already lost forward Chris Simon for the rest of the season - including the playoffs - when he was assessed a league-record suspension of a minimum of 25 games Sunday for swinging his stick and striking Rangers forward Ryan Hollweg in the face in Thursday's 2-1 loss.
"He's a big piece of the puzzle and we already lost Chris, who brought us a lot of physical play," Marc-Andre Bergeron said. "Now that we've lost him, hopefully we're not going to lose Rick for a number of games."
Elsewhere in the NHL it was: Ottawa 3 New York Rangers 2, Toronto 3 Tampa Bay 2, Minnesota 3 Vancouver 2 (OT), Carolina 3 Florida 1, Dallas 3 Philadelphia 2, Pittsburgh 5 Buffalo 4 (SO), Detroit 5 Nashville 2, and San Jose 7 Chicago 1.
At Montreal, Guillaume Latendresse scored twice and Christopher Higgins got the go-ahead goal as Montreal moved two points behind the Islanders and Carolina, who hold the last two playoff spots.
Latendresse and Michael Ryder scored second-period goals to draw the Canadiens even 2-2. Latendresse got his second of the game - the 19-year-old rookie's 15th of the season - midway through the third to tie it 3-3 before Higgins beat backup Mike Dunham from the edge of the crease at 11:26.
"We know that we have some character players here and we know if everybody works together we have some good chances, and that's what happened tonight," Latendresse said.
Rookie Andrei Kostitsyn picked up his third assist of the period with a nifty backhand pass to Tomas Plekanec, who scored the Canadiens' fifth goal at 18:34.
David Aebischer finished with 24 saves for Montreal, which won its second in a row as it returned from a five-game road trip.
Alexei Yashin scored his first goal in nearly two months for New York in the first period, and Ryan Smyth beat Aebischer on a penalty shot early in the second to put the Islanders up 2-0. Smyth assisted on Bergeron's 12th goal 15:05 into the middle period as New York regained the lead 3-2.
The Islanders, who entered seventh in the Eastern Conference with 78 points, lost for the third time in four games (1-2-1). It was the first game they lost in regulation when leading entering third period (25-1-4).
"Anytime you get a couple of goals like that, you've got to keep pressing and try to get the third one and make that spread even more," Smith said. "We just sat back and let them get into the game."
Latendresse scored his second of the game 8:39 into the third to tie it 3-3, though he had to wait through a video review after play had continued for 19 seconds after his shot beat Dunham and slipped under the crossbar.
"I was pretty sure because when it hits the post, it makes a harder sound, so I was pretty sure it was in," Latendresse said.
The sellout Bell Centre crowd of 21,273 erupted into cheers when a replay on the video scoreboard clearly showed the puck strike the upper bar in the back of the net while referee Eric Furlatt waited on the phone in front of the penalty boxes with referee Greg Kimmerly and linesman Mark Shewchyk.
The officials looked up to see another conclusive replay shown to the crowd's delight while they waited for the official verdict from the other end of the line, which finally came a minute after the initial replay was shown.
Senators 3 Rangers 2
At New York, Andrej Meszaros' bank shot off the stick of Rangers defenceman Marek Malik snapped a third-period tie and lifted Ottawa to victory.
Maple Leafs 3 Lightning 2
At Toronto, Nik Antropov scored the go-ahead goal early in the third period, leading the Maple Leafs past Tampa Bay.
Wild 3 Canucks 2 (OT)
At Vancouver, Minnesota defenceman Brent Burns scored in overtime for the second straight game to lead the Wild to victory over Vancouver.
Hurricanes 3, Panthers 1
At Raleigh, N.C., Cory Stillman, Rod Brind'Amour and Scott Walker scored to lead Carolina past Florida.
Stars 3 Flyers 2
At Dallas, Mike Modano became the second U.S.-born player to score 500 goals, and the 39th in NHL history, leading the Stars to a victory over Philadelphia.
Penguins 5 Sabres 4 (SO)
At Pittsburgh, Sidney Crosby scored the deciding goal in the shootout as the Penguins celebrated the announcement that they're staying in Pittsburgh for the next 30 years with a victory over Buffalo.
Red Wings 5 Predators 2
At Nashville, Tenn., Kyle Calder scored and had two assists, and the Detroit Red Wings moved within a point of the NHL-leading Predators.
Sharks 7 Blackhawks 1
At San Jose, Calif., Bill Guerin scored his first three goals for the San Jose Sharks, and Evgeni Nabokov fell 3½ minutes short of posting his fourth shutout in five games during their victory over the Chicago.