Is it necessary for a teen to see a urologist for bed wetting?

Yes: If your personal doctor/pediatrician thinks this is necessary and recommends it.

Not necessarily: Any physician with experience, interest & expertise in managing this problem, could be pediatrician, family doctor, nephrologist ok or urologist. First worth trying home remedies: stop fluids after supper, urinate before bed, set alarm or wake 2 hours after going to bed, then bedwetting alarm (pottymd.Com). Then dr. Who may try medication. Avoid urodynamics &/or cystoscopy unless proven necessary.

Yes: At that age the emotional and social implications of bed wetting can be pretty significant. I would recommend a visit to a pediatric urologist.