The 35-year-old suffered a broken toe during a training run over the summer.
Injuries force the fastest American of all-time out of the November 4 race.
New policy is amended after participant complaints.
The fourth-place finisher at the Olympic Marathon leads a strong American contingent.
Many of the famous faces in attendance were running for a cause.
Thousands comes out for first NYRR Dash To The Finish Line 5K.
He's struggled with drug and alcohol problems since he became a celebrity.
Coverage begins on Sunday at 9:00 a.m. ET.
The field ranges from seasoned runners to debutants.