Dr. Aaron Deitz, 72, a founder of Prince George's County General Hospital and Medical Center and its chief of general medicine from 1962 until his retirement in 1974, died there Monday of a pulmonary embolism.

Dr. Deitz was chairman of the Maryland State Board of Health and Mental Hygiene from 1959 to 1973.

In 1944, he obtained the original grant for Prince George's General under the Hill-Burton hospital construction grant program.

During World War II, he served as a Navy Seabee, receiving a medical discharge as a lietuenant commander in 1943.

Dr. Dietz had been a director of the Riverdale branch of the Citizens Bank & Trust Co. of Maryland since 1945. He was a vice president of the bank from 1976 to 1978.

He was born in Pennsylvania and received a bachelor's degree in 1928 from the University of Pennsylvania. In 1932, he graduated from Jefferson Medical College in Philadelphia. He began his medical practice in Hyattsville in 1933.

He was a member of the Royal Society of Health of London, England, and Woodmont Country Club in Rockville. He served as a delegate to the Democratic National Convention in 1961.

Survivors include his wife, Margaret S. Oxenburg Deitz, of the home in Hyattsville; a son, Dr. Robert D., also of Hyattsville; a daughter, Beverly D. Stanbury, of Potomac, and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Dr. Aaron Deitz Memorial Fund, c/o Prince Goerge's County General Hospital and Medical Center, Cheverly.