Meet Your Board-Certified Family Physician


"My mission is to provide you with answers for all your medical needs easily and effectively. I believe the easier it is to receive expert medical care, the healthier and happier you will feel."

A solid educational foundation you can trust...

"I had always looked up to our family physician when I was growing up. I wanted to be a doctor, too, because I liked to help people. Although I am board-certified and family practice-trained, my education does not stop there. Medicine is an ever-changing discipline, and aside from continuing education in medicine, I have learned much from my patients. I have learned that medicine is an art as well as a science. The art of listening and communicating with people is very important. Treating people with respect and genuine concern is something I strive for every day. Learning is a never-ending process, and my patients are a very integral part of this process."

Board-Certified: American Board of Family Practice
Fellow: American Academy of Family Practice
Family Practice Residency: Delaware County Memorial Hospital, Drexel Hill, PA
MD: Ross University School of Medicine, New York, NY
BA: Biology, California State University, Fullerton, CA
Member: American Medical Association, American Society for Laser Medicine & Surgery
Licensure: State of California

Advanced training brings you the latest breakthroughs...

"As a family physician with an emphasis in dermatology, my education is ongoing. I stay active in professional organizations and take continuing-education classes each year. I want to make sure I know the latest, most effective ways to care for you."

Continuing Education: High Blood Pressure (Hypertension), Diabetes, Cholesterol Problems, Depression & Anxiety, Heart Disease, Allergies, Asthma, Arthritis, Pediatric Medicine, Women's Healthcare, Emphysema, Osteoporosis, Cancer, Botox®, Chemical Peels, Facials, Laser Hair Removal, Laser Skin Resurfacing, Microdermabrasion, Spider Veins, Acne

To relax, Dr. McMillian enjoys running marathons, cycling, golf and spending time with his family.


Family Nurse Practitioner: University of Southern California, Post-Master's Certificate
MS: Nursing Administration, Cal State University, Los Angeles, CA
BS: Nursing Administration, Cal State University, Long Beach, CA
Member: California Coalition of Nurse Practitioners, Sigma Theta Tau Nursing Honor Society

Discover family healthcare you can trust at Rancho Family Practice Associates. Call 909-942-0247 or use our Request an Appointment form. We welcome patients from Ontario, Pomona, Rancho Cucamonga, Chino, Fontana and close-by communities.

Our Services

  • Acute Illnesses

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  • Chronic Illnesses

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  • Preventative Care

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  • Women's Health

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  • Diet & Nutrition

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  • Blog Posts

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Contact Us Today

Lothar McMillian, MD, FAAFP, is the medical director of Rancho Family Practice Associates located at 7777-B Milliken Avenue, Suite 240 in Rancho Cucamonga, CA 91730 and serving Rancho Cucamonga, Chino, Fontana, Ontario, Upland and the surrounding California communities. Phone: 909-941-0247. Fax: 909-948-7950


Address: 7777-B Milliken Ave., Suite 240 Rancho Cucamonga, CA 91730