Myron "Mike" Lotz, 67, a general internist who had a private practice in Vienna for 19 years until his retirement in 1987, died of cancer July 11 at Inova Fairfax Hospital. He lived in McLean.

Dr. Lotz, who came to the Washington area in 1962, was a specialist in endocrinology. He was a clinical assistant professor of medicine at Georgetown University from 1968 to 1987. In retirement, he did medical missionary work in Mexico, Central America and South America.

He was a native of Ohio and a zoology graduate of Yale University, where he also received a medical degree cum laude. He studied cellular biology and pathology at Oxford University and interned and served his residency at Massachusetts General Hospital.

From 1962 to 1965, he served in the Navy and attained the rank of commander. During those years, he was assigned to the Public Health Service as a senior surgeon at the National Heart Institute.

He was a past member of the board of governors of the Northern Virginia Consortium for Continuing Medical Education and the Heart Association of Northern Virginia. He was a member of the Oxford Society of D.C., the Yale Society of D.C. and the Harvard Society of D.C.

His marriage to Janice Gay Holler Rogers ended in divorce.

Survivors include two children, Robin Michaeljohn Lotz of Richmond and Ariel Lee Lotz of Blacksburg.