Altered chords have one or more alterations to one of the given formula.
In altered chords, the notes to be altered are always part of the chord name, enabling you to construct the chord. For example, a Cm7#5b9 (not listed above) is a Cm7 chord with the fifth sharpened (#5) and the ninth flattened (b9). When you are working out a suitable shape for this chord, remember that the root note and/or the fifth note may be omitted.