Your Medicare Administrative Contractor is determined by where you practice, and it decides who processes your claims, who hears your redetermination, and whose local coverage determinations bind you. Practices in different states follow genuinely different rules.
Medicare Part B claims are processed by regional contractors, not by Medicare itself. Roughly a dozen cover the country, each responsible for defined jurisdictions.
The practical consequences
They are who you call. Provider services, claim status, and reopening requests all go to your contractor rather than to a national number.
They hear your first appeal. A redetermination is decided by the same contractor that issued the denial. Their reading of a policy is the reading that matters at that level.
They write local coverage determinations. This is the big one. National policy sets a floor; local determinations fill the gaps. The same service can be covered under one contractor and denied under another, with no difference in the medicine.
Where the jurisdiction boundary bites
Multi-state practices are the obvious case: two locations an hour apart can fall under different contractors with different local policies. But it also matters for a single-location practice that takes a policy interpretation from a colleague, a forum, or a vendor operating in a different jurisdiction. Advice that is correct elsewhere can be wrong for you.
What to know about yours
- The contractor's name and jurisdiction designation.
- Which other states share it — policy knowledge transfers within a jurisdiction.
- The local coverage determinations touching your highest-volume services.
- Their provider services number, kept somewhere findable.
Our state pages list the contractor for each state alongside the Medicaid program and the auto-injury rules, because those three facts do more to shape billing than anything else that changes at a state line.
Map locations, not the practice
Jurisdiction follows where the service was furnished. A group with sites in two states has two contractors and potentially two answers to the same coverage question.
Record the contractor per location rather than per organization, and check policy accordingly.
Know the DME jurisdiction separately
Durable medical equipment is administered through its own contractors in most areas, on a different jurisdiction map from Part A and Part B.
Practices that supply equipment need both, and confusing them produces claims sent to a contractor that will not process them.
Keep the contact route to hand
Provider contact center, portal, and the escalation path. When a claim needs a human, knowing which contractor and how to reach them saves the hour usually spent finding out.
Re-check after a re-award
CMS periodically re-awards jurisdictions, and the new contractor brings its own portal, submission details and local policies. The change is announced and easy to miss.
A sudden cluster of unexplained rejections in one location is worth checking against the jurisdiction map before assuming a submission problem.
Common questions
- How do I find out which MAC covers my state?
- CMS publishes the jurisdiction map. Your contractor is determined by the geographic location where services are furnished, not by where the practice is headquartered.
- Why does my MAC matter for coverage?
- Because it issues local coverage determinations. Where no national policy exists, your contractor decides what is payable in your jurisdiction.
- Who handles my Medicare appeal?
- Your MAC handles redetermination, the first level. Later levels go to a Qualified Independent Contractor and then an Administrative Law Judge.
- Do MACs handle Part A and Part B differently?
- Most handle both within their jurisdiction, and some jurisdictions have separate contractors for durable medical equipment.
- What if I practice in more than one jurisdiction?
- You follow each contractor’s rules for services furnished in its area, which means maintaining more than one set of coverage references.
Denials Piling Up?
We handle the revenue cycle end to end — coding by certified coders, claim submission, denial management and appeals, and A/R follow-up, with six reported numbers every month.