Trusted medical billing services based in Grand Rapids, Michigan, serving practices throughout the United States with over 30 years of proven expertise in revenue cycle management.

Since 1993, Nyssen Billing has been a trusted partner for medical practices across Michigan and throughout the United States. Our Grand Rapids-based team combines local expertise with nationwide reach, delivering comprehensive revenue cycle management services that maximize collections and minimize administrative burden for practices of all sizes.
Every practice has different needs, but your billing system should always do the same thing: reduce denials, improve collections, and speed up reimbursements. Nyssen Billing provides complete medical insurance billing support to help West Michigan practices run smoother and get paid faster.
OUR LONGEVITY SPEAKS FOR ITSELF:
Claims Submission & Follow-Up
Accurate claims and proactive follow-up to keep revenue moving.
Revenue Cycle Management
End-to-end oversight from patient visit to payment.
Accounts Receivable Management
We monitor aging claims, resolve issues early, and reduce outstanding balances.
Reporting & Analytics
Clear reports that show performance trends and opportunities for improvement.
When you choose Nyssen Billing, you’re choosing a team that understands the financial heartbeat of your practice and works tirelessly to protect it.
Whether you're a solo practitioner in Michigan or a multi-location practice spanning multiple states, Nyssen Billing provides end-to-end billing solutions tailored to your specialty and practice size. Our experienced team handles every aspect of your revenue cycle so you can focus on patient care.
OUR LONGEVITY SPEAKS FOR ITSELF:
Claims Submission & Follow-Up
Accurate claims and proactive follow-up to keep revenue moving.
Revenue Cycle Management
End-to-end oversight from patient visit to payment.
Accounts Receivable
We monitor aging claims, resolve issues early, and reduce outstanding balances.
Reporting & Analytics
Clear reports that show performance trends and opportunities for improvement.
When you choose Nyssen Billing, you’re choosing a team that understands the financial heartbeat of your practice and works tirelessly to protect it.


Consistent claim handling helps reduce delays and keep reimbursements moving.
Paid faster. Fewer surprises.
With accurate coding and follow-up, more claims get approved, and more revenue gets collected.
Fewer rejections. More approvals.
We handle the time-consuming billing work so your team can focus on patients and operations.
Your team stays focused on care.
Whether you’re a small office or a growing multi-provider practice, we adapt to your needs.
Built to grow with you.
We’re proud to serve medical practices across Grand Rapids and the surrounding West Michigan area, offering billing services that are structured, responsive, and designed to keep revenue flowing.

Mary Nyssen
Mary Nyssen is an experienced medical billing professional and physician office manager with over 40 years of experience in healthcare administration. In 1991, she founded her own medical billing business, which quickly grew through her expertise, efficiency, and commitment to quality service. She has extensive knowledge of medical billing, insurance processing, and managing the daily operations of a busy physicians' office, and is recognized for her accuracy, organization, and dedication to supporting both providers and patients.

Barb Martin
Barbara Martin CPC is an accomplished Certified Professional Coder (CPC) with over 30 years of experience in medical coding, compliance, and healthcare revenue cycle management. Throughout a three-decade career, Barb has developed deep expertise across multiple specialties, including outpatient, inpatient, surgical, and physician-based coding. Known for exceptional accuracy, regulatory knowledge, and audit-ready documentation practices, Barb has supported healthcare organizations in improving coding quality, optimizing reimbursement, and maintaining full compliance with evolving ICD, CPT, and HCPCS guidelines.

Wendy Sutherland
Wendy Sutherland is an experienced Billing Account Manager and HR Manager with over 25 years of expertise in medical insurance billing. She has built a strong career managing billing operations and overseeing administrative functions for podiatry practices, ensuring accuracy, efficiency, and exceptional organizational workflow. Wendy is known for her deep industry knowledge, leadership skills, and commitment to supporting both staff and patients through streamlined practice management.
We’re always open to connecting with experienced medical billers and coders who value accuracy and teamwork. If you’re looking for a supportive place where your skills matter, we’d love to hear from you.
Our patients are at the heart of everything we do. Their experiences reflect our commitment to providing compassionate care, trusted expertise, and personalized attention.

"The doctors and staff made me feel completely at ease. Their care and attention were exceptional—I felt supported every step of the way."

Housewife

"I was impressed by the speed and accuracy of the diagnostic services. The staff explained everything clearly, which helped me take the right steps for my health."

Entrepreneur

"From scheduling to follow-up, the entire experience was seamless. The team truly cares about patient well-being."

Verified Buyer

"The online consultation was so convenient! I could speak with a doctor from home and get professional advice without any hassle."

Business Owner

"I appreciate the personalized care I received. They didn’t just treat my symptoms—they guided me on how to maintain my overall health."

Housewife

"Professional, friendly, and compassionate. I trust this healthcare center completely and recommend it to everyone."

Entrepreneur
Our Frequently Asked Questions section is designed to provide clear answers to common queries about our services, appointments, treatments, and policies.
You can easily book an appointment online through our website or by calling our support team.
Yes, we provide secure and convenient online consultations with our experienced doctors.
Many of our services are covered. Please check with your insurance provider or contact us for assistance.
Yes, our Emergency & Urgent Care services are available 24/7 to handle critical health situations.
Absolutely. We offer wellness and preventive care packages designed to help you stay healthy.
Have questions about your billing process, claims, or reimbursement delays? Send a message and our team will get back to you as soon as possible.
Based in Grand Rapids, Michigan, Nyssen Billing proudly serves healthcare practices throughout the Great Lakes State and across all 50 states. Our remote billing capabilities mean we can support your practice wherever you're located, while our 30+ years of Michigan healthcare experience brings valuable local insights to every client relationship.
Primary Service Areas:
- West Michigan (Grand Rapids, Muskegon, Holland, Kalamazoo)
- Throughout Michigan (Detroit, Lansing, Ann Arbor, Traverse City, and beyond)
- Nationwide medical billing services for all specialties
If your team is looking for a local billing partner that understands your workflow and communicates clearly, we’d love to help.
4310 Leonard St NW # 103, Grand Rapids, MI 49534
(616) 453-6329

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