Medicare Part B , which includes a variety of outpatient services cover medically necessary clinical diagnostic laboratory tests when a doctor or other practitioner orders them. Medically necessary clinical diagnostic laboratory tests are generally not subject to coinsurance or deductible. It will cover medically necessary imaging tests, such as computed tomography (CT) scans, as needed for treatment purposes for lung infections, however not for screening asymptomatic patients. For those imaging tests paid by Part B, beneficiary coinsurance and deductible would apply. If the Part B deductible ($198 in 2020) applies to the Part B services, beneficiaries must pay all costs - up to the approved amount of Medicare until the beneficiary meets the yearly Part B deductible. Once it is met, Medicare pays its share, and beneficiaries typically pay 20% of the approved amount of the service, except laboratory tests. There’s no yearly limit for what a beneficiary pays out-of-pocket tho...