Mercy Health System
1.888.39.MERCY

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Mercy Partners: Physicians & Allied Health Professionals


Tad M. Johnson, MD
Johnson_Tad.jpg Specialty  Allergy/Immunology
Facilities  Mercy Clinic East
Mercy Walworth Hospital and Medical Center
Address  3424 E. Milwaukee St.
Janesville
WI, 53546
Phone  (608) 756-7100
Address 2  Hwys. 50 and 67
Lake Geneva
WI, 53147
Phone 2  (262) 245-0535
Certification  American Board of Pediatrics, American Board of Allergy and Immunology
Medical Education  Mayo Clinic College of Medicine, Rochester, MN
Residency  Children’s Hospital of Wisconsin, Milwaukee
Fellowship  Allergy/immunology: Medical College of Wisconsin, Milwaukee
Gender  male
Interests  Dr. Johnson treats patients of all ages. His special interests include severe food allergies, drug allergies, bee stings, asthma, hay fever and eczema.
Additional  "Education is key. My patients deal with diseases that are directly related to the environment they live in, so it's very important for me to help them distinguish their symptoms, provide medicines that improve those symptoms, and educate them on how to use those medicines. My years of experience have really helped me know which methods work best in treating a wide range of symptoms."

Mercy Blogs:

  • Asthma can be controlled
  • The allergy-asthma connection




  • Health Talk Podcast: Dr. Johnson - March 8, 2014