Its is referred to as 595 only in official state and federal documents. As far as I know, the answer is no. But it's shown as MD 313 on maps all the way back to 1933. It may have been suggested for inclusion in the original US route system, but rejected, or perhaps an alternative inland routing for 213. Select from the links below.
Decommissioned routes are in italics.
Information is laid out the same as the state route pages.