Assuming that you arrive by train (the Yokosuka linie) at ZUSHI station.

There is a bus terminal to the right of the direction the train has been moving into.

Take ANY bus leaving from stop No. 2.

After about 10 minutes (ca. 5 stops) the bus stops approx. 200 m in front of a tunnel (there is only one Tunnel in Hayama; the slightly longer tunnel after the second bus stop - that is still Zushi).

That bus stop is called "Kazahayabashi". Get off at this stop.

Immediately in front of the tunnel there is a traffic light and bakery called "Bon Jour" on the corner.

Turn right at this corner (traffic light9 and follow the street for about 3-400 m.

You will reach a bridge called "Kame-ido Bashi" across a small river.

Immediately in front of this river, on the right side you will see my (green) sign.  

(In front of my clinic on the right side of the road they have built several white houses.)

The walk from the bus stop should not take much longer than ca. 5 minutes.  

(There is ONE parking space right in front of my clinic.)