About
Rejan C. McCaskill, MD, FACP is a board-certified internal medicine physician with more than twenty years of clinical experience. She earned her medical degree from the University of California, Irvine and completed her Internal Medicine Residency at Providence Portland Medical Center in Oregon. Her professional peers elected her as a Fellow of the American College of Physicians, recognizing her leadership, clinical excellence, and ongoing contributions to medicine. She currently serves as an ACP Governor for Southern California. In that role, she champions high-quality care and supports physicians and patients through advocacy, mentorship, and education. She also holds membership in the Orange County Medical Association and the California Medical Association.
Dr. McCaskill is known for her warm, attentive presence in the exam room. She takes time to listen carefully and understand each patient's full health picture before charting a path forward. She stays current through regular continuing medical education. Outside the office, she enjoys time with her husband and two children, along with reading, traveling, and spending time outdoors.
Education & Training
Medical School
University of California, Irvine
Residency
Internal Medicine, Providence Portland Medical Center, Oregon
Certifications
Conditions Treated
Who is Dr. McCaskill right for?
Dr. McCaskill is a strong fit for adults seeking a long-term primary care relationship built on prevention and early detection. Patients managing chronic conditions such as diabetes, hypertension, atrial fibrillation, COPD, or heart failure benefit from her comprehensive internal medicine background. She works well with patients who want direct access to their physician and expect thorough, unhurried visits. Those navigating complex care involving specialists or hospital stays will appreciate her hands-on coordination. Healthy patients who want a proactive partner in maintaining their wellness also find her practice a good match.
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Frequently Asked Questions
Dr. McCaskill treats a wide range of adult medical conditions. These include diabetes, hypertension, atrial fibrillation, heart failure, COPD, asthma, high cholesterol, GERD, osteoporosis, insomnia, sexually transmitted diseases, and cancer screening. She also manages ongoing chronic illnesses and coordinates care with specialists when needed.
Yes. Dr. McCaskill holds board certification in internal medicine. She also holds the distinction of Fellow of the American College of Physicians, an honor recognizing clinical excellence and leadership in the field.
Dr. McCaskill earned her medical degree from the University of California, Irvine. She then completed her Internal Medicine Residency at Providence Portland Medical Center in Oregon.
Dr. McCaskill has practiced medicine for more than twenty years. She brings that experience to every patient visit, combining deep clinical knowledge with an attentive, personalized approach.
Dr. McCaskill takes time to listen and understand each patient's health history and goals before recommending a course of action. She emphasizes wellness, prevention, and early disease detection. Her concierge model gives her the time to build genuine, lasting relationships with her patients.
Yes. Dr. McCaskill coordinates specialist referrals directly and expedites the process on your behalf. If you need hospital care, she communicates directly with your hospital team to help ensure continuity and quality of care.
Dr. McCaskill is a member of the American College of Physicians, the Orange County Medical Association, and the California Medical Association. She also serves as an ACP Governor for Southern California.
Yes. Prevention and early detection are central to Dr. McCaskill's clinical philosophy. She conducts cancer screenings, wellness planning, and proactive health assessments to help patients stay healthy over the long term.
Enrolled patients receive Dr. McCaskill's direct cell phone number and email address. She remains reachable after hours and on weekends, giving patients access to their physician when questions or concerns arise outside of regular office hours.
Doctor profile last updated April 11, 2026