About MMSM | Michigan Medical Billing & Credentialing Company

Who is Medical Management Systems of Michigan?

Medical Management Systems of Michigan, Inc. (MMSM) is a locally owned, U.S.-based medical billing and physician credentialing company headquartered in Lansing, Michigan. For more than 30 years, MMSM has helped physicians, surgical groups, EMS agencies, and urgent care clinics — across Michigan — increase collections, reduce denials, and stay compliant — with real, accessible specialists rather than an offshore call center.

Three decades, one mission: get Michigan providers paid

Medical Management Systems of Michigan was founded on a simple idea — that healthcare providers deserve a billing partner who treats their revenue with the same care they treat their patients. More than 30 years later, that’s still exactly what we do.

We’re not a faceless national vendor, and we’re not an offshore back office. We’re a locally owned, Lansing-based team that Michigan physicians, surgeons, EMS agencies, and clinics trust with the lifeblood of their organizations: getting paid.

What we believe

Your revenue is personal. Every denied or underpaid claim is money you earned. We chase it like it’s ours.
Transparency builds trust. You should always know your clean-claim rate, your days in A/R, and your net collections — no black boxes.
Local beats offshore. Outsourcing should save you money and headaches. Keeping your account in the U.S., with people you can reach, is how we deliver both.
Specialty expertise matters. Surgery, EMS, and urgent care each have their own rules. Generic billing leaves money behind.

What we do

We provide a complete, connected revenue cycle for the providers we serve:

Because all of it lives under one roof, your credentialing, enrollment, and billing actually talk to each other — so the moment a provider is approved, we’re billing.

Built for Michigan

We’re proud to be Michigan’s billing and credentialing partner — based in Lansing and serving providers from Grand Rapids to Detroit, the Tri-Cities to Traverse City. Michigan is home, it’s where our roots run deep, and it’s where we focus every day. See the areas we serve.

Ready to work with a partner who answers the phone? Contact us or call (517) 485-0001.

Answers

Frequently asked questions

Straight answers to the questions providers ask us most. Don't see yours? Just ask.

How long has MMSM been in business?

More than 30 years. We’ve spent three decades focused on one thing — helping Michigan healthcare providers get paid correctly and on time — through every major change in coding, compliance, and payer rules.

Is MMSM locally owned?

Yes. We’re locally owned and based in Lansing, Michigan. When you call, you reach people here — not a routing menu to an overseas team.

What makes MMSM different from national billing companies?

Accountability and access. National and offshore vendors often treat your account as one of thousands. We assign named account managers, work every denial, and report transparently — and because we also handle credentialing and enrollment, there’s no finger-pointing between vendors when something goes wrong.

Ready to get paid faster?

Talk with a Michigan-based billing and credentialing specialist. We'll review your current numbers and show you exactly where revenue is leaking — no cost, no obligation.

Request a Free Consultation (517) 485-0001