Final answer:
Non-institutional providers and suppliers bill Medicare, Part B services using the CMS-1500 form, which handles reimbursements for provided services under a fee-for-service system.
Step-by-step explanation:
The form used by non-institutional providers and suppliers to bill Medicare, Part B covered services, is the CMS-1500. Individuals under Medicare Part B, which is an optional insurance offering that covers physician services, medical tests, and outpatient visits, utilize this form. Providers who offer services under a fee-for-service health financing system are reimbursed for the cost of the services they provide, which is documented through the submission of the CMS-1500 form.