Rural Behavioral Health Access Act of 2021 This bill allows for Medicare payment of outpatient critical access hospital (CAH) services consisting of telehealth behavioral therapy, including (1) audio-only services, if an individual does not have access to technology with both audio and visual capabilities; and (2) services provided to an individual who has not received in-person care at the CAH, if there is a plan of care that includes an in-person visit not later than one year after telehealth services are provided.