Fusion Medicine · Personalized, Not Protocols
Integrative Medicine and Health Optimization in Wisconsin
Green Medicine of Wisconsin is an integrative medicine clinic in Oshkosh, Wisconsin, for two kinds of people: those with complex, hard-to-explain illness, and those who feel well and want to stay well for the long run. Care comes from two nurse practitioners, starts with an unhurried first visit in person, and is self-pay with a superbill. The initial appointment is $710.
Most people arrive here after a long stretch of being told that nothing is wrong. The labs came back normal, the visit was fifteen minutes, and the symptom is still there. Others already feel good and want to feel even better, with more energy now and a longer, stronger healthspan for the years ahead. This clinic is built for both, the people searching for answers and the people investing in a healthier, longer life.
What integrative medicine means here
Integrative medicine is an approach, not a product. Standard medical care is good at naming a condition and matching it to a treatment. We start somewhere else: why is this happening in this particular person. Two people with the same fatigue may arrive there by different roads, and the plan that helps one may do nothing for the other.
It is an approach to health that looks at root causes rather than just treating symptoms. Symptoms in one body system often connect to dysfunction in another. Gut issues affect mood. Hormone shifts affect everything. We treat the system, not just the part.
Evelyn Andersen, Owner and Provider
The work starts with history. A long one: the timeline, what changed, the medications, the sleep, the stress, and the parts of your story that never seemed relevant enough to mention. Visits here are unhurried by design, and we see patients for years rather than for episodes.
The fusion: natural therapies and prescriptions together
This is what patients most often get wrong about us. Prescriptions and standard testing are part of how we practice. We refer to specialists when that is the right call, and we ask you to keep your primary care provider. What we add are the layers a fifteen minute visit has no room for. Some call this integrative medicine, some call it root-cause medicine, and Evey calls it Fusion Medicine. The label matters less than the method.
A multi-tool clinic, not a one-thing clinic
We are a whole-person medical practice with a deep range of tools, from advanced laser therapy and peptides to hormone care, and the evaluation determines which of them belong in your plan. A clinic organized around one modality has a reason to find that modality in every patient. A clinic organized around the evaluation does not.
The tools we reach for
Each has its own page, and each is a possible part of a plan rather than a destination on its own.
- Lyme and tick-borne illness care, what our providers are best known for.
- Mold illness and CIRS evaluation, which often overlaps with tick-borne illness.
- Weber Endolaser therapy, an intravenous light therapy.
- IV therapy and nutrient infusions, inside a medical practice, not a storefront.
- Peptide therapy, clinician-directed, never an online order.
- Hormone health and perimenopause care.
- Homeopathy, one possible layer of an individualized plan.
The full list of what we offer is on Our Services.
If you are unwell
You do not need a diagnosis to become a patient, or your symptoms organized into a tidy story. Bring the whole thing. We use labs where they genuinely add information, and we know that a normal result and feeling well are not the same thing. Conditions we work with include Lyme and tick-borne illness, mold and CIRS, long COVID, thyroid disease, autoimmune conditions, hormone imbalance, chronic fatigue, fibromyalgia, chronic pain, and gut and metabolic dysfunction.
Health optimization and longevity
The other half of this practice is health optimization and longevity: patients who already feel good and want to feel even better, with more energy for the life they are living now and a longer, stronger healthspan for the years ahead. Their plans are built on their own history, labs, habits, and goals rather than a population average. The method is the same, but the questions and the pace are different, and the focus is on staying strong, sharp, and active for the long run.
That work often draws on advanced lipid and cardiometabolic panels, in-depth micronutrient panels, and comprehensive thyroid and hormone testing, alongside hormone optimization, metabolic health, performance, and prevention.
What to expect from this approach
This is thorough, long-term medicine. Plans draw on lab work, prescription options, nutrition, lifestyle, and targeted therapies rather than supplements alone, and they are refined over months with your practitioner. Your first visit is in person at our Oshkosh clinic, 3 to 4 hours in total: about 2 hours one-on-one with your provider, in-office labs, and 40 to 60 minutes with our RN reviewing your plan. For emergencies, the emergency department is always the right place.
Who you will be working with
Evelyn (Evey) Andersen, MSN, APRN, FNP-C, AdvPracHom(RMDY), FAAMM, ABAAHP, CISSN, owns the practice and is a family nurse practitioner, homeopath, and certified sports nutritionist. Dr. Jamie Lorrigan, DNP, APRN, ACNPC-AG, is a Doctor of Nursing Practice certified in adult-gerontology acute care, and leads our acute tick bite video visits. Both are licensed nurse practitioners with full prescribing authority and deep integrative training. Evelyn holds board certification and a fellowship through the American Academy of Anti-Aging Medicine (A4M), and both have taken coursework through the Institute for Functional Medicine. Our Lyme care is guided by the International Lyme and Associated Diseases Society (ILADS). Dr. Kevin Green, MD is our collaborating physician and medical director. Meet our team.
Patients Come to Oshkosh from Across Wisconsin
Patients come from across Wisconsin for integrative and functional medicine here. Oshkosh sits in the heart of the Fox Valley: about 25 minutes from Appleton and Fond du Lac, about 45 minutes from Green Bay, about 90 minutes from Milwaukee, and under 2 hours from Madison and Wausau. The first visit runs 3 to 4 hours at the clinic, so many people plan it as a day trip. Phone and video follow-ups are available while you are in Wisconsin, so not every visit needs the drive. Coming from out of state? See Traveling to Oshkosh for airports and the Green Medicine Rate at the Hilton Garden Inn.
Becoming a patient
There is one front door. Whether you come for a complex chronic illness or a wellness visit, you become a patient through our new-patient intake, and your history is reviewed before your first visit. No service here is ordered off a menu without a clinical conversation first.
Patients come to us from across the country, and care happens in person at our Oshkosh clinic, which also serves the Fox Valley, Appleton, and surrounding communities. Our schedule often books out a few months, so it is worth starting sooner rather than later.
Ready now? Begin your intake. Questions first? Call (920) 651-3600 or contact us.
Frequently asked questions
What is integrative medicine?
It is an approach that asks why a problem is happening in you specifically, rather than matching a label to a standard treatment. It leans on a long history, a personalized plan, and follow-up over time, and it blends natural therapies with prescriptions rather than choosing between them.
Is this a replacement for my regular doctor?
No. We work alongside your regular doctor, coordinate with your other providers, and we will say plainly when something belongs with your primary care provider or a specialist.
Do you only see people who are sick?
No. A good share of our patients feel reasonably well and want a plan built on their own history rather than a population average.
Do you take insurance?
We are a self-pay practice, because the longer visits and comprehensive workups are not what insurance reimburses. We provide a superbill after each visit for commercial insurance, and outside lab work may still be billed through your insurance. We are not enrolled in Medicare, Medicaid, or CHIP.
Do you see patients outside Wisconsin?
Yes. We welcome patients from across the country and have cared for patients internationally. Your visits happen in person at our Oshkosh, Wisconsin clinic, since our providers are licensed in Wisconsin, and many patients travel in for care. Phone and video follow-ups are available where state licensure permits.
How much does it cost?
The initial appointment is $710 for a 2-hour office visit with your provider, and your $200 deposit is applied to it. A typical first visit is $2,000 to $2,200 including labs and supplements, and often less, since in many cases labs are covered by your insurance. Follow-up visits are $300 to $400. Full details are on our Become a Patient page.
How long until my first appointment?
New patient appointments usually book out about 2 to 3 months, sometimes longer during peak tick season, in the order intakes are received.
Care at Green Medicine of Wisconsin is provided by Evelyn Andersen, MSN, APRN, FNP-C, and Dr. Jamie Lorrigan, DNP, APRN. Page updated October 11, 2026.
These statements have not been evaluated by the FDA. Nothing on this page is intended to diagnose, treat, cure, or prevent any disease. Care at Green Medicine of Wisconsin is provided only within a clinical relationship, under the guidance of our providers, and begins in person at our Oshkosh, Wisconsin clinic.