Final answer:
Under the Medicare split bill model, iRhythm does not bill Medicare Part A patients, Medicare Part D patients, or Medicare Advantage patients. It does bill Medicare Part B patients.
Step-by-step explanation:
The Medicare split bill model is a payment system used by iRhythm, a medical device company that provides cardiac monitoring services. Under this model, iRhythm does not bill Medicare Part A patients, as Medicare Part A primarily covers hospital charges and iRhythm's services are not typically provided during a hospital stay.
iRhythm bills Medicare Part B patients because Part B covers physician services, medical tests, and outpatient visits, which are relevant to iRhythm's cardiac monitoring services. Similarly, Medicare Advantage patients (who have chosen Medicare Advantage plans as an alternative to Original Medicare) are also billed by iRhythm, as these plans must cover the same services as Original Medicare Part B.
However, iRhythm does not bill Medicare Part D patients because Part D specifically covers prescription medications, and iRhythm's services are not prescription medications.