Louis Block, 68, an authority on health care administration, died Thursday at his home in Hollywood, Fla., after a heart attack. He had moved there from Bethesda four years ago.

Dr. Block was chairman of the board of Block, McGibony and Associates Inc., health and hospital consultants in Silver Spring.

He was a cofounder of the firm in 1959, and served as its president until 1970. Before that, he had been an officer with the U.S. Public Health Service here, which he joined during World War II.

A teacher and lecturer, Dr. Block was a professor in the School of Health Care Administration at the George Washington University Graduate School of Business until 1971. He had lectured at the School of Hospital Administration at the Naval Medical Center in Bethesda.

He was born in New York City and grew up in Ann Arbor, Mich. A graduate of the University of Michigan, he earned a master's degree at Columbia University and returned to the University of Michigan for a doctorate in public health.

Dr. Block helped found the Mount Sinai Medical Center and Hospital of Greater Miami. He was the author of numerous publications in his field.

He was a fellow and past president of the Academy of Hospital Consultants and a fellow of the American Public Health Association. He belonged to the American Hospital Association, the American Association of Hospital Planners, the Association of Military Surgeons, Accountants 52 Club and the Academy of Hospital Counselors. He was a Mason and member of B'nai B'rith.

He is survived by his wife, Beatrice, of the home; a son, Andrew, of Miami; a daughter, Carol Bellmore, of Baltimore; a brother, Abraham, of Miami; two sisters, Rose Tessmer, of Hollywood, Fla., and Irene Gaines, of Pompano Beach, Fla., and two grandchildren.