Bringing direct personalized endocrine and diabetes care to central Indiana.

If you are like most people, you have probably noticed that our current insurance-based model of health care limits the time you can spend with your doctor. Many people feel rushed through appointments, unheard, and frustrated that they can’t get in touch with their doctor, and don’t have clarity on their medical bills. 

Impact Endocrinology offers an innovative approach to endocrine care where patients actually get to spend quality time with the doctor. As a patient, you deserve a doctor who has the time to listen and the ability to see you when you need care - without limitations imposed by insurance plans. Dr. Grethen provides personalized care where your health is the priority, not your insurance policy. 

Dr. Grethen specializes in all aspects of endocrinology, but especially enjoys treating patients with diabetes, thyroid disease, osteoporosis and calcium disorders. Click here to learn more.

At Impact Endocrinology patients will experience:

  • Unrushed, relaxed visits

  • Minimal to no wait time for your appointment

  • Direct communication with Dr. Grethen

  • Appointment availability

  • Transparent pricing

  • Discounted lab tests

Dr. Grethen is committed to the individual needs of every patient. After a thoughtful and thorough evaluation, Dr. Grethen provides medical recommendations based on studies that have demonstrated beneficial patient outcomes. She does not recommend medications, supplements or services which have not been proven safe and effective.

Learn more about the direct care model
Learn more about endocrinology

While Dr. Grethen offers one-time consultations and second opinions, her passion lies in chronic management of endocrine disease. She has observed over the years that a strong doctor-patient relationship improves long-term health outcomes. She loves getting to know her patients well and providing care for them as they journey through life. If you are looking to receive consistent high-quality endocrine care tailored to your needs, membership may just be for you! See our Membership and Pricing page to learn more.

contact / schedule