Best Functional Medicine Doctors in Illinois

Functional medicine practitioners who address root causes of disease through systems-oriented, patient-centered care. Browse and compare functional medicine doctors across Illinois, algorithmically scored, powered by real data.

Showing 28 of 29 functional medicine doctors in Illinois

Last updated: May 2026

The highest-rated functional medicine doctors in Illinois include Sarah J. Zielsdorf, MD, MS (BDS 9.5), Jessica Hehmeyer, DC, MS, LDC, CNS, IFMCP (BDS 8.8), Peter Kozlowski, MD, IFMCP (BDS 8.8). Rankings are based on BestDosage's transparent BDS scoring methodology, which evaluates reviewed reputation, listed credentials, professional presence, profile depth, and location detail — five weighted criteria drawn from public data.

BestDosage has evaluated 29 functional medicine doctors across Illinois based on credentials, patient reviews, and practice transparency. The average BestDosage Score across Illinois is 6.8 / 10 — with a range of established and emerging practices across the state. Functional medicine doctors are typically MDs, DOs, NDs, or NPs with additional training through the Institute for Functional Medicine (IFM). Look for board certification and documented experience with root-cause, systems-based protocols.

Frequently Asked Questions

Who is the best functional medicine doctor in Illinois?

The highest-rated functional medicine doctors in Illinois based on BestDosage Scores include Sarah J. Zielsdorf, MD, MS (BDS 9.5), Jessica Hehmeyer, DC, MS, LDC, CNS, IFMCP (BDS 8.8), Peter Kozlowski, MD, IFMCP (BDS 8.8). Rankings are updated regularly using credentials, patient reviews, and practice transparency data.

How are functional medicine doctors in Illinois scored?

Each functional medicine doctor is scored across five weighted criteria drawn from public data: reviewed reputation, listed credentials, professional presence, profile depth, and location detail. Scores run to 10, and we publish one only at 7.0 or above.

How many functional medicine doctors are listed in Illinois?

We currently have 29 functional medicine doctors listed in Illinois. Browse by city to find providers near you.

How much does a functional medicine doctor cost in Illinois?

Functional medicine doctor costs in Illinois vary by provider, treatment type, and whether insurance is accepted. Many practitioners offer free consultations. Use BestDosage to compare pricing transparency across providers.

What should I look for in a functional medicine doctor?

Look for verified credentials, high patient review scores, transparent pricing, and relevant specializations. BestDosage evaluates all of these factors in its BDS scoring methodology so you can compare providers at a glance.

Which cities in Illinois have the most functional medicine doctors?

The top cities for functional medicine doctors in Illinois include Chicago (29).

Does insurance cover functional medicine doctor visits in Illinois?

Insurance coverage for functional medicine doctor visits varies by plan and state. Some providers accept insurance directly, while others offer superbills for out-of-network reimbursement. Check individual practitioner profiles on BestDosage for insurance details.

Is it free to find a functional medicine doctor on BestDosage?

Yes, browsing the directory, viewing profiles, and comparing providers is completely free. Our scoring methodology is published openly for full transparency.

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Reviewed by Chad Waldman, Analytical Chemist · BestDosage Editorial Team · Last updated May 2026

Best Functional Medicine Doctors in Illinois

Functional Medicine Doctors by City in Illinois

Other Wellness Providers in Illinois

Sarah J. Zielsdorf, MD, MS

Jessica Hehmeyer, DC, MS, LDC, CNS, IFMCP

Peter Kozlowski, MD, IFMCP

Terese Black, ND, DC, IFMCP

Alison Lechner, DO

Tristah Romero Kelly, NP

Crystal J. Dillett, APNP

Sandra A. Lambatos, DC

Frances Baxley, MD

Victoria Nee, MD

Maureen M. Milota, APRN, MSN, IFMCP

Tamara Nosa, Family Nurse Practitioner, APRN-FPA

Hetal Shah, MD

Janusz Mejer

Kelsey Heckaman, FNP-C

Lauren M. Towle, MD

Rajka Milanovic Galbraith, MD

Joanna Kleszcz, MSN, APRN, ANP-C

Sandra Wright

Debra R. Brunk, DNP, FNP-BC

Rachael Fabbi, DC, DABCI, IFMCP

Casey Kelley, MD

Judy Marshall, MS

Cara VanWormer-Hartman, DC

Kori Feldman, MD

Brittany M. Parisot-Sebby, DC, DABCI, DACBN, IFMCP

Inna Hoffman, APNP

Cynthia L. Jakubiec, DC

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