Dr. Erin Megan Pettijohn, MD

Dr. Erin Pettijohn is a board-certified oncologist and internal medicine physician who has dedicated 15 years to treating cancer patients and blood disorders. She earned her medical degree from Wayne State University School of Medicine and completed her residency training at Northwestern University. Dr. Pettijohn brings specialized expertise in both cancer care and comprehensive internal medicine to her practice. She is fluent in English and Spanish, allowing her to serve diverse patient populations throughout the Grand Rapids area.

Dr. Pettijohn practices at multiple locations across Grand Rapids and Norton Shores, Michigan, with affiliations at Corewell Health Butterworth Hospital, Trinity Health Grand Rapids Hospital, and Mercy Health Mercy Campus. She specializes in treating complex blood conditions including multiple myeloma, thrombocytopenia, and iron deficiency anemia. Her diagnostic expertise includes performing comprehensive blood work such as complete blood counts and …metabolic panels to help identify and monitor various health conditions. Dr. Pettijohn also utilizes white blood cell differential testing to provide detailed analysis for her patients' treatment plans.