Thank you for choosing Clayton Medical Associates, P.C. for your medical care. We strive to make your visit to our office as easy and comfortable as possible. Please feel free to browse our website as it contains valuable information about our office. We have created an on-line registration and appointment-scheduling feature to make your experience with our office go a little smoother.

John Budd III, M.D. and Chad Ronholm, M.D.are board certified in Rheumatology. Clayton Medical Associates is located at 6400 Clayton Rd., Suite #110, St. Louis, MO 63117. If your treatment requires a hospital stay, we are right next door to SSM St. Mary’s Hospital and use their hospitalists to care for our patients. We have Ultrasound capabilities as well as Infusions of Bilogics in our office to offer a more full service experience.  We have a Quest Diagnostics and MOBAP laboratory on site.

Our practice utilizes Physician Assistants to offer a more complete health care experience and better accommodate a wider range of schedule availability.  Our Physician Assistants are all NCCPA Certified and work closely with our physicians to assure the most comprehensive care plan for your medical needs.  The PA’s on staff are Beatrice A. Bernhart, PA-C, Sarah M. Wilmsmeyer, PA-C, Michael O. Hessel, PA-C, Rachael E. Hartke, PA-C and Trisha L. Specter, PA-C.

We accept almost all insurance carriers and welcome inquiries about whether or not your carrier is accepted. We will submit claims to marketplace plans but are out of network for most of them. Unfortunately, we do not accept any form of Medicaid at this time.


Thank you for allowing us to serve you. We will post upcoming Holiday hours for your convenience.                                                         

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Every year October 6-12 is designated as PA appreciation week through the American Academy of Physician Assistants. We are proud to have these four wonderful PAs as part of our CMA family so that we can bring the highest quality Rheumatology care to our patients.

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Spring allergy season is right around the corner. Remember to ask your provider about taking over-the-counter allergy medications to make sure they do not negatively interact with your other medications. Happy Spring!  

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