Cross Town: Take the M31 to the East 69th Street stop, directly in front of NewYork-Presbyterian/Weill Cornell. The M31 operates north and south on York Avenue, and across town on 57th Street. Cross-town buses M30, M66, and M72 allow you to transfer to the M31 at York Avenue.
Uptown and Downtown: You may also take the M15 bus, which travels uptown along 1st Avenue and downtown on 2nd Avenue. Exit at 68th Street. Either transfer to the M66 line eastbound to York Avenue and 68th Street or walk 1 or 2 blocks east to the hospital.
From Port Authority Terminal: Take the #10 bus on Eighth Avenue going uptown. Get off at 65th Street. Transfer to the #66 bus going east. Get off at 68th Street and York Avenue.