Is there any way to treat a plantar wart other than surgical excision?

Yes, plenty.: I am currently using laser treatment with great success. See your podiatrist to discuss all you options, of which there are many. (it's not likely they will even suggest surgery).

Laser or freeze: The best ways to treat a plantar wart are by using a laser, liquid nitrogen, or a strong anti-viral/acid medication to the wart. See your podiatrist as he can help you with all of these.

Yes: Topical medication. I have had several patients use duct tape over the wart and it disappeared.

Yes: Topical medication or freezing it. Some oral medications have been used which secondarily can cure wart. See your podiatrist.

Several treatments.: You can try over the counter wart removers, but be careful: i've seen them do more harm than good. Other options your doctor might offer include cryotherapy (freezing the wart), electrocautery (burning the wart), laser treatment, or several different topical chemical treatments. If the treatment is typically uncomfortable, your doctor can numb the area before proceeding.

Sure : Lasers, acids, oral meds like Cimetidine can work to name a few.