David Papik of Farmingville has been charged with second-degree scheme to defraud.
Suffolk County police say the man went door-to-door soliciting money in Farmingville.
He allegedly said he was collecting for a walk to benefit the Multiple Sclerosis Foundation.
One woman reportdly gave him $10, but she became suspicious and notified police.
The investigation is continuing.
Police ask anyone with information to contact Crime Stoppers at 800-220-TIPS.
It was not immediately clear if Papik has a lawyer.