The C#9 sus 4 chord (C#9 suspended 4, or B/C#) contains the notes C#, F#, G#, B and D#. It can be thought of as a C#9 chord with a 4th (instead of a 3rd) or a B chord with a C# in the bass.

10 Ways To Play The C#9 Sus 4 chord

If you’ve come to this page just to view some chord diagrams for C#9 Sus 4 (B/C#), here they are.

A Sharp 9 Sus 4 Chord 10 Shapes