A minor add9 chord is created by adding a 9th degree to any minor chord. For example, a Cmadd9 chord contains the notes C, Eb, G and D (1, b3, 5 and 9). Here are some common open minor add9 chord shapes.
Cmadd9
Dbmadd9
Dmadd9
Ebmadd9
Emadd9
Bmadd9
F#madd9
Fmadd9
Gmadd9
Abmadd9
Amadd9
Bbmadd9