Dr. Lawrence L. Weed, who introduced a system for organizing patient data in the 1950s that is now used in hospitals all over the world, and who led the way in developing a computerized method for aiding in the diagnosis and treatment of diseases, died on June 3 at his home in Underhill, Vt. He was 93.

His son Lincoln confirmed the death.

In the early 1950s, Dr. Weed was a professor of medicine and pharmacology at Yale, where he spent most of his time doing research on microbial genetics. On occasion, though, he would accompany students on their hospital rounds and watch as they struggled to interpret the often chaotic patient notes left by doctors.

It was a sobering experience. “I realized then — and it was very upsetting — that they weren’t getting any of the discipline of scientific training on those wards,” Dr. Weed told The Journal of the American Medical Informatics Association in 2014. “When I pick up a chart that is a bunch of scribbles, I say: ‘That’s not art. It certainly isn’t science. Now, God knows what it is.’”

He responded by creating the problem-oriented medical record, or POMR, a way of recording and monitoring patient information. Two of its features have become nearly universal in health care: the compiling of problem lists and the SOAP system for writing out notes in a patient chart. SOAP stands for subjective, objective, assessment and plan, reflecting the steps that doctors and other health care providers should follow as they move from an initial patient encounter to tests, diagnosis and treatment.