Aetna considers percutaneous tibial nerve stimulation (PTNS) (Urgent PC Neuromodulation System, Uroplasty, Inc., Minneapolis, MN) medically necessary for the treatment of members with urge UI or urge-frequency when they meet the first two criteria listed for the InterStim Continence Control Therapy (policy section I. C1 and C2 for the treatment of urge urinary incontinence or symptoms of urge-frequency). In general, 12 treatments (once-weekly) with PTNS are needed for symptom relief. If the member fails to improve after 12 PTNS treatments, continued treatment is considered not medically necessary. If the member improves after 12 PTNS treatments, continued monthly treatments are considered medically necessary as long as the member’s symptoms remain improved.