The Rangers lead the best-of-7 series 2-1.
Stepan was released from the hospital Saturday night and visited teammates Sunday morning before returning home. Coach Alain Vigneault said there is no timetable for his return.
Stepan had surgery Friday to repair a broken jaw sustained in Game 3 when Canadiens forward Brandon Prust hit him 2:45 into the first period. He has never missed a game in his four-year NHL career, a span of 348 regular-season and Stanley Cup Playoff games.
Prust was suspended two games by the NHL for the hit.
Stepan is tied for second on the Rangers in scoring in the Stanley Cup Playoffs with 11 points in 17 games.