About
Dr. John E. Croghan co-founded Dedication Health. He holds triple board certification in Internal Medicine, Rheumatology, and Geriatric Medicine. Dr. Croghan received his medical degree from Rush Medical College. He completed his residency at Loyola University Medical Center. He pursued a fellowship in Geriatric Medicine at Johns Hopkins University. He also completed a Rheumatology fellowship at George Washington University. Dr. Croghan focuses on guiding patients with personalized preventive health plans.
Education & Training
Medical School
Rush Medical College
Residency
Internal Medicine, Loyola University Medical Center
Fellowship
Geriatric Medicine, Johns Hopkins University School of Medicine; Rheumatology, George Washington University Medical Center
Certifications
Conditions Treated
Who is Dr. Croghan right for?
Dr. Croghan is a strong fit for adults who want a physician with deep expertise across multiple specialties. Older adults benefit especially from his geriatric medicine background. Patients managing autoimmune or joint conditions find his rheumatology training directly relevant. He works well with patients who want a structured, preventive approach to long-term health.
Similar Doctors Nearby
Dr. Anat LanskyM.D.
acute illness, preventive health, chronic disease management +1 more
Dr. Richard SternMD
cardiovascular disease, hypertension, hyperlipidemia +3 more
Dr. Jana MechurovaMD
Frequently Asked Questions
Dr. Croghan practices Internal Medicine, Rheumatology, and Geriatric Medicine. This combination allows him to care for adults with complex, overlapping health needs. He holds board certification in all three specialties.
Yes, Dr. Croghan holds triple board certification. He is board certified in Internal Medicine, Rheumatology, and Geriatric Medicine. Few primary care physicians carry credentials across all three of these areas.
Dr. Croghan earned his medical degree from Rush Medical College. He completed his Internal Medicine residency at Loyola University Medical Center. He then pursued fellowship training at two prestigious institutions: Johns Hopkins University School of Medicine for Geriatric Medicine and George Washington University Medical Center for Rheumatology.
Dr. Croghan treats a broad range of adult conditions, including rheumatologic diseases, age-related health concerns, and chronic internal medicine conditions. His geriatric medicine training makes him well-suited to care for older adults with multiple health issues.
Dr. Croghan focuses on personalized preventive health planning. He works with each patient to build a proactive plan tailored to their individual health profile and goals.
Yes, Dr. Croghan co-founded Dedication Health. He helped build the practice around a philosophy of disease prevention and personalized care for adult patients on Chicago's North Shore.
Doctor profile last updated March 21, 2026