Thanks for the responses.
I noticed in the Wiki citation that "The first measure is a G minor chord with an added natural 13 (Gm13), which contains an F natural but the modality of the piece is already evident as the opening note of the melody is an E natural, which is the leading tone of the F major scale."
My fake book has the opening note of E natural but the first measure chord is a BbMaj7 #11.
I think the Gm13 chord is G, Bb, D, F, E and the BbMaj7#11 chord is Bb, D, F, A, E#/F (again, I think), so apparently my fake book is a little off (or my ability to figure out 11ths and 13ths is).