Dr. Erin Megan Pettijohn, MD

Dr. Erin Pettijohn specializes in oncology and internal medicine, bringing 15 years of experience to cancer care and blood disorder treatment. She earned her medical degree from Wayne State University School of Medicine and completed her residency at Northwestern University. Dr. Pettijohn is fluent in both English and Spanish, helping her connect with diverse patient populations.

Dr. Pettijohn practices at multiple locations throughout Grand Rapids, Michigan, with affiliations at Corewell Health Butterworth Hospital, Trinity Health Grand Rapids Hospital, and Mercy Health Mercy Campus. She focuses on treating complex blood cancers including multiple myeloma and acute myeloid leukemia. Her expertise also extends to managing thrombocytopenia and other blood disorders. She regularly performs comprehensive blood work including complete blood counts and white blood cell differentials to monitor patient health and treatment progress.