Which Medicare Contractor Covers Your State

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.