"I think that's just a ballpark figure on this type of surgery," manager Joe Torre said before Wednesday night's game against Arizona. "It's tough. He had a little episode in spring training and I guess he had a little piece of the disc break off, and that's what they're going to deal with. He's in a lot of discomfort, sleeping and sitting."
Ausmus, a three-time Gold Glove winner who turned 41 on Wednesday, is on the disabled list for the first time in his 17-year career.
Ausmus batted .295 last season in 36 games as Russell Martin's backup.