There are extended suspended chords, essentially suspended chords with added tones higher than the 5th degree of a scale. The only extended sus chords I know are 7sus2 (C-D-G-Bb), 7sus4 (C-F-G-Bb), and 9sus4 (C-F-G-Bb-D). Additionally, it is impossible to have a 9sus2 chord, that would have the notes C-D-G-Bb-D (duplicate notes). But, there are extended sus chords higher that go higher than the 9th degree (11th, 13th...)?
Well, sort of -- bear with me on this one. You can suspend what you might analyse as the 13th resolving down to the 12th.
But need we call this a 13-12 suspension or would it be OK to call it a 6-5 suspension? And is it even a suspension at all? It's been argued that this "suspension figure" is not a suspension because the would-be suspension note is not a dissonance in the chord.