Peripheral nerve field stimulation (PNFS) delivered by a medical device to
a patient may be programmed by specifying one or more characteristics of
a stimulation field generated by the IMD to provide the PNFS. The
characteristics of the stimulation field may include, for example, a
direction of stimulation within the field, a breadth of the stimulation
field, a focus of stimulation within the stimulation field, a depth of
the stimulation field relative to a reference point, such as the
epidermis of the patient, or a nerve fiber diameter selection.