Dempsey successfully pulled the driver from the wreckage -- a 17-year-old named Weston Massett -- who tells TMZ, when he opened his eyes, the actor was looking right down at him. Massett asked, "Are you famous?" ... and Patrick coolly replied, "I'm a doctor."

We're told Patrick called Massett's mother and told her about the accident -- keeping her calm the entire time. Massett was then airlifted to a nearby hospital, and Patrick followed to make sure the kid was okay.

Miraculously, Massett suffered no serious injuries -- just a concussion and a "stretched" optic nerve. He's expected to make a full recovery.

There was also a passenger in the car, Dylan Miller, but thankfully we're told Miller suffered no injuries whatsoever. - See photos here.

TMZ submitted this story. Copyright TMZ - Excerpted here with permission.

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