His clinical interests include thyroid problems, gallbladder problems, and hernia. He takes Blue Cross Blue Shield Bronze, Blue Cross Blue Shield HMO, and Blue Cross Blue Shield Gold, as well as other insurance carriers. Before performing his residency at St. Joseph's Hospital, Dr. Johnson attended the University of Texas Medical School at Houston for medical school. He is professionally affiliated with CHI St. Luke's Health - The Vintage Hospital and Houston Northwest Medical Center.