Authorities said around midnight, the victim was sitting in a back room in his house in the 600 block of East 113th Street when he was hit in the leg from a falling bullet. The bullet entered through the roof and grazed the man's leg.
No shooter has been found, and no suspect information was available.
For years, celebratory gunfire has been a problem in Los Angeles on New Year's Eve. Over the years, a few people have been killed.
Anyone caught unlawfully discharging a gun can be booked for a felony.
City News Service contributed to this report.