C sharp dominant flat ninth piano chord - C#7b9

The C sharp dominant flat ninth chord is a 5-note chord consisting of the notes C#, E#, G#, B and D.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as C#7b9.

Interactive piano diagram for the C sharp dominant flat ninth chord

Piano keyboard displaying the C sharp dominant flat ninth chord with the notes E# F Cb B C# Db G# Ab D

Reduced chords

Chords that are a subset of C#7b9. These contain less notes but all of them are included in C#7b9.

C sharp dominant flat ninth piano chord chart image

In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the C#7b9 chord. Feel free to save or share the image as needed.

Piano chord chart for the C sharp dominant flat ninth chord (C#7b9). The notes C#, E#, G#, B and D are highlighted.