MAC (Medicare Administrative Contractor)

MACs handle nearly every routine interaction between an agency and Medicare:

• Process and pay claims, including Notices of Admission and final claims
• Run prepayment edits and conduct medical review, including Additional Documentation Requests and Targeted Probe and Educate
• Decide redeterminations, the first level of Medicare appeals
• Manage provider enrollment actions in their jurisdiction
• Publish local coverage determinations (LCDs) and billing guidance
• Provide education through webinars, articles, and help desks

CMS sets national policy, but the MAC interprets and applies it day to day, which is why two agencies in different jurisdictions can have slightly different review experiences under the same rules.

Unlike most provider types, home health and hospice have their own MAC structure layered on top of the standard A/B jurisdictions. Three contractors split the country: Palmetto GBA, CGS Administrators, and National Government Services, each responsible for home health and hospice claims from an assigned set of states. An agency bills the HH+H MAC assigned to its state, and multi-state agencies may deal with more than one. Knowing your MAC matters practically: its portal is where you check claim status and eligibility, its LCDs shape documentation expectations, and its medical review priorities determine what gets scrutinized. Palmetto GBA also administers the Review Choice Demonstration for home health.

Billers live in the MAC's systems. Direct Data Entry (DDE) access to the claims system lets staff see claim status and location codes, catch claims suspended for Additional Documentation Requests, correct returned claims, and monitor NOA processing. MAC websites carry the billing manuals, LCD documentation requirements, and denial code explanations that answer most day-to-day questions. The education side is underused: MACs publish denial trend data and run targeted webinars on the exact issues driving home health denials in their jurisdiction. Agencies that assign someone to monitor MAC bulletins avoid being surprised by edit changes and review initiatives.

MAC medical review is data-driven. Automated edits screen every claim, and targeted programs go deeper: Additional Documentation Requests pull records for prepayment or postpayment review, and Targeted Probe and Educate puts selected providers through up to three rounds of review with education between rounds. The MAC also decides redeterminations when you appeal a denial, so the quality of your documentation and your response timeliness shape outcomes at two stages. A practical habit: monitor claim status codes at least weekly, because ADRs sit in the system with response clocks running whether or not anyone at the agency has noticed them.