Briefly describe the scope and type(s) of discovery available (e.g., depositions, interrogatories, etc.):
Discovery is permitted if CMS or a CMS contractor elects party status in the appeal -- see 42 CFR 405.1037. Under Part 405 adjudications, CMS and CMS contractors may not elect party status if the appellant is an unrepresented beneficiary. Under Part 422 adjudications, the application of the 405 discovery rule is unclear -- the managed care plan (a type of CMS contractor) has party status pursuant to the statute. In Part 423 adjudications, CMS and CMS contractors are not permitted to take party status -- their role is limited to "participant" status, thus no discovery is permitted. Discovery can include limited depositions, interrogatories and document requests are allowed.