Summary | World of Medicare

Examples of providers who send claims for Part A benefits:
- Hospitals
- Skilled nursing facilities (SNFs)
- Home health agencies (HHAs)
- Critical access hospitals (CAHs)
- Hospice agencies
Examples of suppliers who send claims for Part B benefits:
- Physicians
- Non-physician practitioners
- Other suppliers such as ambulance, DMEPOS, and clinical labs
Hospitals, SNFs, HHAs, and CAHs also send claims for Part B benefits. For example, Part B covers hospital outpatient services.
Suppliers who send claims for Part B benefits are either participating or non-participating suppliers.
Medigap helps pay some of the health care costs that Original Medicare doesn’t cover. Generally, people must have Medicare Parts A and B to buy a Medigap policy.
A MAC is an organization that contracts with CMS to oversee the Medicare Program within a specified jurisdiction. MACs are multistate, regional contractors responsible for administering both Part A and Part B claims.