Contact Us
(740) 389-2297
About Midwest
About Appointment

About Midwest Internal Medicine Associate

Based in Marion, Ohio, Midwest Internal Medicine Associates is committed to bringing you and your family access to high-quality, cost-effective primary medical care.

Whether you’re looking for a holistic approach to health, need preventive care, or simply need help, our friendly team is here to treat you like family.

The biggest reason for our 25 years of success is our fantastic team. Read below to learn more about the friendly staff at MIMA.

Dr. Amish Oza MD

Medical Director

Dr. Oza is Board Certified in Family Medicine and is the Medical Director of MIMA. A Buckeye, Dr. Oza trained at The Ohio State Medical Center and stayed up to date with the latest advancements in medicine to bring you advanced care. He is passionate about his patients and creating long-term relationships where patients feel safe and understood. When he’s not in the office, Dr. Oza enjoys spending time with his wife his two daughters, is an avid drone photographer, and enjoys playing tennis.

Dr. Jason Lauf DO

"I was born and raised in Lima, OH where I spent most of my time at my grandparents farm that helped instill my desire to help others in a rural area. I then attended The Ohio State University in Columbus and graduated with a biomedical engineering degree. I then decided to pursue medical school at Ohio University Heritage College of Osteopathic Medicine in Dublin, OH. From there, I decided on Internal Medicine and pursued residency at University Hospital Parma Medical Center. Now, I am looking forward to treating patients in the greater Marion area. Recently married in 2022 and the family now resides in Richwood, OH. We are very much looking forward to helping care for members of our community." ~ Dr. Lauf

RaKay Dunlap PA-C

Physician assistant

RaKay Dunlap is our Physician Assistant at MIMA. Her journey is impressive, starting with her double major in Biology and Chemistry at The Ohio State University, then finishing school at The University of Findlay, earning her Master's in Physician Assistant degree. She made special certifications, specifically, BLS/ACLS/ATLS/PALS. When she's not in the clinic, she enjoys spending time with her daughter and husband and reading a good book.

Diana Duran CNP

I started my journey in Healthcare in 2008 where I worked in LTC as a Nursing assistant before pursuing my Associates degree in Nursing from Marion Technical College in 2009 and then Bachelors and Masters in Nursing from Mt. Carmel College of Nursing in 2019 becoming a Board Certified Family Practice Nurse Practitioner through AANP. Prior to joining MIMA, I was a Post Acute NP first with HCR ManorCare and then traveling to different nursing facilities around Ohio from Lima to Cleveland and then around the Columbus area. I am married with 4 children and 1 fur baby, when I am not working I love spending time with my family and hope to one day start doing some traveling.

Roxanne Oliver CNP

Even from a young age, Roxanne knew she wanted to help people feel the best they could. In 2010, she graduated from Olivet Nazarene University in Kankakee, IL with her Bachelor of Science in Nursing and then with her Master of Science-FNP in 2013. She became a board-certified Family Nurse Practitioner through the ANCC in 2013. She started her practice in Hospice and Palliative Medicine where she partnered with a primary care physician to create a home-based palliative care program that provided symptom management for patients with chronic disease throughout the Chicagoland area.  In 2015, she and her family moved to Ohio where she became a Hospitalist NP at Marion General Hospital. As she gained experience, she built a passion for integrating evidence-based care that would improve patient outcomes. She obtained her DNP from Wilkes University in 2018 and her certificate in Evidence-Based Practice from Ohio State University in 2021 to better translate evidence into practice and to care for her patients. She received her Master's in Organizational Leadership from Columbia Southern University in 2022. Roxanne's current passions include teaching the next generation of APRNs, healthy weight management, hospital care, and preventive care. When not at the hospital or teaching, she enjoys spending time with her husband and two kids, reading, cycling, and walking her dogs.

Christina Padrutt CNP

Christina started in health care over 30 years ago as a high school student, volunteering as a candy striper at her hometown hospital in Paulding, Ohio. She obtained her associate's degree in nursing from Northwest State Community College, a bachelor's degree in nursing from the Ohio State University, a master's degree in nursing from the Ohio State University, and finally, a doctorate of nursing practice degree from Mount Carmel College of Nursing. She is certified as an adult-gerontology primary care nurse practitioner through the American Association of Nurse Practitioners. When not working, Christina enjoys spending time with her husband, their two adult children, and their many pets. She also enjoys attending concerts, musical theater, and going on cruises

Kelly Ratliff

Practice Manager

Sarah Bibler

Billing Coordinator

Michelle O’Brien

CCM Coordinator

Alexis Bishop

Medical Assistant

Sierra Arthur

Medical Assistant

Kimberly Iles


Faber Kleppinger

Medical Records

We’d love to learn more about you.

Now that you know more about us, we’d love to learn more about you. Fill out a form to book an appointment.