A novel garden bean cultivar, designated HMX0164423, is disclosed. In some embodiments, the invention relates to the seeds of garden bean HMX0164423, to the plants and plant parts of garden bean HMX0164423, and to methods for producing a garden bean plant by crossing the garden bean HMX0164423 with itself or another garden bean plant. The invention further relates to methods for producing other garden bean plants derived from the garden bean HMX0164423.