This is a very specific question, which you should consult with your agent since there are so many plans and your agent should be able to look at the Evidence of coverage from your plan in order to give you an accurate answer.
Yes, occupational therapy (OT) is generally covered under UnitedHealthcare Medicare Advantage (MA) plans as part of their required benefits. All Medicare Advantage plans must provide at least the same level of outpatient OT services covered under Original Medicare Part B. just keep in mind, prior authorization might be required.
Occupational Therapy is a Medicare covered benefit. All Medicare Advantage plans are required by Medicare to cover at minimum what Medicare covers. The answer is Yes, but you may need to find an in-network provider with UnitedHealth for them to cover you.