Can absorbent briefs be medically necessary for an adult with bedwetting problems, with no known cause?

Maybe/not: Such issues are more an insurance company or tax write off subject. Although they are a common assistive device in these cases whether a case reviewer or tax agent would accept that determination is hard to say. Often when material is available without prescription a claim might be declined.

Have you tried meds: In my professional opinion absorbent briefs are better than having to change bedding. Some medical insurances will pay provided physician provides letter of necessity. Also can bt income tax deduction if total medical expenses are high enough. There are medications, such as desmopressin, which reduces nocturnal urine production, and can control bedwetting. It requires prescriiption